Electricity Saving Tips For Homes And Offices

Choose right inverter for home and maintain it right to manage electricity bills

By on April 22, 2016
Hindi Translation: घर के बिजली के बिल का उचित प्रबंधन करने के लिए सही इन्वर्टर का चुनाव

Power supply situation continues to be bad in India with power failures ranging from 2 to 4 hours in cities and 8 hours or more in small towns and villages. This makes it difficult to manage daily life and thus installing power backups is inevitable.

Although there are many solutions to this problem but the most common solution that most people apply in India; is to go for an Inverter-Battery system. However when somebody plans to purchase an inverter, the first question that comes to his/her mind is “which inverter to purchase?” and how one knows what suits best for its requirements. When you think of buying a new inverter, it is important to escape from the marketing gimmicks, and understand some basic related facts, eventually of much help before purchasing an inverter. Selecting the right kind of an inverter/battery system is one such important factor. And not just selecting the right inverter-battery system, it is important to select the right solution that solves your need.

In this slightly longish post, we will discuss on various power backup solutions, their pros and cons in different situations and will also help you choose the right one suitable for your need.

What are the various alternate power supply solutions?

  • Inverter: It is a simple device that stores electricity from the grid in a battery and uses the DC (direct current) power from battery and converts it into AC (alternating current) that is used by appliances. Although interchangeably used, but Inverter and UPS are slightly different and we will explain that later in this post. Inverters are generally good if you want backup for small household appliances like lights, fans, TV, computers, etc. However these days’ bigger inverters can also support Refrigerators, Washing Machines and Mixer Grinders. But then adding these big appliances significantly increases the size of Inverter-Battery system and it is best if one can avoid using them on Inverter. Using inverters for ACs is strictly not suggested.
  • DG Sets: DG sets use the power of Diesel to generate electricity. They generate instantaneous electricity rather than storing it. They are good for larger loads. So if you want to run ACs, Refrigerators, Motors, etc on power backup, then using DG set can be a good solution.
  • Solar Power: Solar PV is slowly and steadily gaining popularity and is a great way to generate power backup. Energy from Sunlight is converted into electricity and stored in batteries. However the limitations of Solar Power are similar to that of regular inverters, so they are still not the best solution for bigger loads.

Now we will cover each of them in detail in different sections of this website, but in this article, we will mainly focus on Inverter-battery system.

First understand your Power Requirement

Before purchasing any of the solutions mentioned above, the most important thing is to understand your requirement. To evaluate the power requirement, it is very important for you to know two things upfront:

  • The total load that you want to run on backup: This is essential to get the right size of inverter of power backup solution. And from size we mean the VA value. To get to the VA value, it is very important for you know the wattage (or watts) of each appliance that you want to run on the backup. More details on this are explained in the section below.
  • Total number of hours for which backup is required: This is essential to size the batteries that you need (or in DG sets the litre capacity that you need).

To give you a analogy, imagine the car or vehicle that you have. It has a certain CC capacity (like 800 CC, 1200 CC, 1500 CC), which determines the power that the car has. More power can run faster or can take more load. This is similar to the VA value of inverter, which determines the load that it can take.

The amount of fuel (storage tank capacity) a car/vehicle can store (along with its efficiency) can determine how long (distance) it can go. Similarly battery bank size determines how many hours you can get as backup.

So what do you need to know?

Look at the list of appliances that you want to run on backup and their wattage. Check the list below to get some standard values used for calculations:

  • 1 Fan – Fans Consume 75-90 Watts. For calculation we take 90 watts.
  • 1 tube light – Assume 45-50 watts for standard tube lights. 28 watts for T5 tubelights.
  • 1 CFL – 25 watts (default) or take the actual number if known.
  • 1 Television – LED TVs take 30-100 watts depending on size. LCD TVs consume 50-150 watts. CRT takes about 120 watts.
  • Set top boxes consume anywhere between 8 watts and 25 watts. Standard Definition set top boxes consume 8 Watts. HD boxes consume about 18 watts and HD DVR boxes consumed 25 watts.
  • Desktops consume 120-250 watts depending on type. Those with LCD screens consume about 150 watts and those with CRT about 250.
  • Laptops consume about 50 watts.
  • Wi-Fi routers, modems, mobile phone chargers, etc consume 5 watts or less.
  • Gaming stations and home theatre systems consume 100 watts or more depending on type and size. It should be available on product manual or on manufacturers’ website.
  • A room air cooler would be about 250-300 watts.
  • Induction cooker would be 1000-1500 watts (or 1 – 1.5 kW)
  • Mixer Grinder would also be about 350 watts.

Suppose you want 1 Fans, 1 Tube lights, 1 CFL & 1 CRT television to operate at the time of power failure, i.e. running on inverter. Therefore the total power requirement (based on table above) comes out to be (1*90 + 1*50 + 1*25 + 1*120) = 285 watts. 285 watts here is the total load (as mentioned in point 1 above)

If you want a backup of 6 hours, then you need to store 285 x 6 = 1710 Watt-hour or 1.71 kilo watt hour (or units) of electricity. This is the storage that you need (as mentioned in point 2 above).

Now the calculation above assumes that every appliance will be “switched on” at any given point in time. Taking this exact value is safe. But if you still want to economize the size (to save costs) you can multiply the values by 0.8 if the appliances are for a 1 bed room home, 0.6 for a 2 bedroom home and 0.4 for a three bedroom home (assuming lesser number of appliances will be on at any given time).

Find the VA rating of the inverter you require

Now in an ideal situation the total Watt value (sum of wattage of all appliances as calculated above) should be the same as VA value. But due to a factor called “Power Factor” (explained in this article: link), it is not the same. For a residential house we assume power factor to be about 0.7 to 0.8 (to be super safe assume 0.7 and to be economical assume 0.8). So VA value is Total load in Watts divided by 0.8. So in the case above VA value would be:

285 / 0.8 = about 356 VA

Now you may not get an inverter of exact 356 VA but you will have to go with an inverter with VA value more than 356 (say 400 VA). As it is everything is an assumption, so we assume a value that is safe.

Find the battery size that you require

Now in the example above we needed a 356 VA inverter and we want a backup of 6 hours, then the total VAh that we need is:

356 x 6 = 2136 VAh

A regular inverter battery available in market is of 12 V, so the Ah value of battery required would be:

2136 / 12 = 178 Ah

If you go the market to purchase a battery then the first thing that you need to look at is the Ah value, which is representative of how much energy a battery can store. Typical Ah value of inverter batteries in market are: 100 Ah, 120 Ah, 150 Ah, 180 Ah, 200 Ah.

So in our example a 180 Ah battery would be ideal for the system.

What about bigger appliances?

Appliances like Refrigerator and Air Conditioners have motors in their compressors that need huge amount of current to start (unless you have inverter technology refrigerator or air conditioner). This significantly increases the VA and size requirement for an inverter.

A typical 250 lts refrigerator has a compressor which in steady state would consume about 300-350 watts, but just because it needs more current to start up, one would need about 2.5 kVA inverter to support such refrigerator. However because the compressor starts and stops as per the cooling needs, the total energy consumption per day for a refrigerator would only be about 1.5-2 units or kWh per day. So including a refrigerator in the appliance mix increases the size of the inverter significantly, but not of the battery.

Also the reason we do not recommend including Air Conditioners on inverters is because the demands of air conditioners is quite high. A 1 ton AC which typically consumes 1000 watts (or 1 kW) would need 3.5 kVA inverter just to manage its starting load. A 1.5 ton AC consumes 1500 watts and needs 5 kVA inverter to manage its load. The electricity consumption of ACs is also quite high, and a 1 ton AC would consume about 0.8-1 unit of electricity in an hour and a 1.5 ton would consume about 1.5 units in an hour. So number of batteries needed also significantly increase if you put AC on inverter.

Note: Inverter technology Refrigerators and ACs do not need high amount of current to start and thus if you have an appliance with inverter technology, then you can include AC or Refrigerator in the sample calculations (of other appliances) as above (and need not worry about high kVA value).

Issues with longer backup needs and Voltage of Inverter.

Many people have long power cuts (8-10 hours) and in such case, setting up inverters becomes difficult unless the load is less. As we have seen above, typical batteries available are of 12 V and of size 100 Ah, 120 Ah, 150 Ah, 180 Ah and 200 Ah. If for longer backup you need about 400 Ah battery storage, then you will have to go for two numbers of 200 Ah batteries. But this brings another challenge: that of Voltage of Inverter.

Typical small inverters (less than 1400 VA) are generally of 12 V. Which means you can either connect only 1 battery or if you want to add more batteries then you have to put them in parallel (as shown below).

Source: www.gizmology.net

Batteries in Parallel (Source: www.gizmology.net)

But typical charging current of an inverter is about 10-15 Amp. Which means if you have one number of 200 Ah battery then it will charge in:

200 Ah / 10 A = 20 hrs

If you put two such batteries in parallel then the current will divide into two parts and thus charging time will become:

200 Ah x 2 / 10 A = 40 hrs

In such case if you have power cuts every day, then the battery itself will not charge in a full day. In fact if you put a 200 Ah battery and you need 10 hrs backup, then that itself will not happen because charging time is 20 hrs.


A possible solution is to go for an inverter with higher Voltage (say 24 V or 48 V or more). In canse you go for a 24 V inverter system, then you can connect batteries in series (as shown below), which does not divide the current (same amount of current charges both the batteries).

Batteries in Series (Source: www.gizmology.net)

Batteries in Series (Source: www.gizmology.net)

So if you need 200 Ah backup, then you can go for two numbers of 100 Ah batteries and put them in series. And the charging time will be

100 Ah / 10 A = 10 hrs

But then inverter with higher voltage are of higher VA value. Like 24 V system starts with 1400 VA onwards.

So it is important to go for right Voltage inverter.

What is “C rating” of batteries?

Although it is irrelevant to think about this while buying batteries, but we have got questions on it in past. If you are not curious, you can choose to ignore this section.

But if you are curious then the C rating (or the coulomb rating) of the battery (or cell), is the measure of the quantity of charge in a fully charged cell. The Coulomb capacity is provided in AH or Amp Hour unit. In other words, we can say that the C rating of a battery indicates the continuous current drawn (in amps), the cell will support. By multiplying the C rating with the cell capacity in milli-ampere-hours (mAH), the continuous current in milli-amperes (mA) of a cell can be determined. For example, in a 1,000 mAH battery with a C20 rating, the continuous current that may be drawn out of the battery is 1,000 mAH x 20 = 20,000 mA, or 20 amps (A) (divide by 1000). Keep in mind that 1,000 milliamps equals one amp. So from the above calculation, we ascertain that the battery will produce 20 amps of continuous discharge.

However, a C20 rating battery is considered ideal for the inverters and that is the C rating with which most inverter batteries are available in market. So if you ask for inverter battery, you will mostly get one with C20 rating.

Types of Inverter and How to Choose One

There are two types of inverters available in Market: Pure Sine Wave Inverter and Modified Sine Wave Inverter (or Square Wave Inverter). The choice will depend on the kind of appliances that you have.

If you want to run electronic appliances (like TVs, Computers, etc) on inverter, then go for Pure Sine wave Inverter, else you can go for Modified Sine Wave Inverter.

Please not Modified Sine Wave Inverter can cause humming noise when used with induction motors like ceiling fans, etc.

Difference between UPS and Inverter:

Although used interchangeably, there is a difference between UPS and Inverter. The basic function and architecture remains the same, but the difference is minor.

The difference between a UPS and Inverter lies in the time in which it can switch to battery power when a power cut happens. A UPS can switch to battery power in 3-5 milli seconds, whereas an inverter does it in 100 milli seconds. The choice between the two will depend on how critical is the switching to backup for the appliances that you want to support. For e.g. a desktop computer would need faster switching as you can loose data if it switches off even for a few milli seconds.

Even in UPS there are Online and Offline UPS. Online UPS are those in which the power is drawn from the battery irrespective of the availability of power from main line. This makes sure that there is no loss of work even for a few milli seconds when there is a power cut. Offline UPS is one where the power is drawn from battery only when there is power cut. All other times it is drawn from mains.

Types of Batteries and how to choose one

There are 3 types of batteries available in market: Flat Plate, Tubular and Maintenance Free. Without getting too much into details, all we can say is that Tubular Batteries are the best choice for inverters. They may cost slightly more than Flat Plate, but they will last longer. Maintenance Free batteries may sound good, but they have lesser life (4-5 years as compared to 7-8 years of a tubular battery). But the most important thing to run batteries for a longer times is to make sure that it is topped (filled) with distilled or RO water frequently and the fluid levels are maintained.

What would be the cost of 500 VA inverter and 100 AH battery?

The cost of an inverter with 500 VA would be around Rs. 3,000 and for 100 AH battery would be approximately Rs. 10,000. Therefore, if you are looking for an inverter with 500 VA and 100 AH battery, it would cost you around Rs. 13,000. Why not go online to search and compare the best deals and save the money that you may have to pay to the middle man, the quality of products and warranty is same and since now some of the e-commerce sites are providing the options of cash on delivery, there is no need to worry more about the delivery.

Other things to consider

Warranties: While purchasing batteries, one must look for maximum warranty. An inverter battery combo of the same brand is useful at times as manufacturers send their engineers for maintenance on a regular basis, which increases the life of the inverter/battery system.

In past Inverters and batteries were manufactured by different manufacturers. Su-kam, Luminous, Microtek were known manufacturers of inverter, whereas Amaron, Exide, etc were known manufacturers of batteries. But now all of them have inveter-battery combos where batteries and inverters are designed to work well with each other. So a combo system works well.

Inverter is a maintenance free product and shall not require any schedule maintenance except failure attention. Maintenance is only needed for batteries.

Efficiency of Inverter/battery system

Inverters are not 100% efficient and thus running the same appliances on inverter would cost you about 25% more. But DG sets will be slightly more expensive (which is about 33% more).

Inverters use some energy to drive its electronics and cooling fan. Battery uses additional energy during the process of charging and discharging. All this energy is wasted as heat energy. It is in the order of 8% during no load and goes up to 20% during full load. This inefficiency is generally taken care by the manufacturer and the rating mentioned is what is at the output terminal. Therefore, energy efficiency is generally not taken into account.


We hope that this information helps you choose the right inverter for your house. We have tried to include answer to every question that we get on this website, but if you still have some doubt, you can leave a note in the comments section below.

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  • San

    Dear Abhishek,

    What if main supply is back while an inverter is in use, I mean inverter supply input & output are from a single power (Plug) cord right, so how it will turns off inverter supply to source while main supply is back.
    where I can get a wiring diagram of inverter supply to source (Fans & lights)

  • Srikar

    What happens when one exceeds load of Inverter when there is Grid power available? Will it by pass to Grid power or will it shut down? I want to purchase a lower capacity inverter but will that restrict my usage even during times when there is no power cut?

    • https://www.bijlibachao.com Abhishek Jain

      Even when the power is available from the grid, you should not exceed the load on inverter. Work with your electrician and he will be able to split the load in your house in two parts 1) on Inverter 2) not on inverter. And make sure that the one on inverter is within the range that the inverter can handle.

      If you buy a low capacity inverter, then you divide the line in your house in such a way that only the load that can be handled by the inverter is on the inverter.

    • Er Papun

      sir which brand is best for buying inverter apc or luminous?????

  • kalim shekh

    I want faster charging inverter with battery backup 6 hours. load 3 fans, 6 cfl, 1 led tv. please recommend me.

    • https://www.bijlibachao.com Abhishek Jain

      As per the calculations, the VA value you need is about 600 VA and Ah (battery backup) you need is 300 Ah. Even if you economize (or assume only 80% appliances are on at any given time), it comes to about 470 VA and 235 Ah. The biggest battery that is available for inverter is 200 Ah. So if you really want 6 hours backup, you will have to go for two 150 Ah batteries. Now two batteries will make is 12V+12V=24V system. So in that case the smallest 24V system would be a 1400 VA system. So if you really want 6 hours backup, go for a 1400 VA 24V system with two 150 Ah batteries.

  • r pawar

    I want invertor for one fan and one cfl bulb for 6 hr backup ,please suggest the invertor and price

    • https://www.bijlibachao.com Abhishek Jain

      One Fan and One CFL would hardly be 100 Watts. It is quite a small requirement. Theoretically, a 150 VA inverter and 80 Ah battery should be more than enough for your needs, but then minimum the inverters start from is 400 VA. I think yours is a great case for implementing a small Solar DC power system with DC fan and CFL bulb. You can check out something like this: http://sukam-solar.com/sukam-solar-dc-system/

    • Rajesh Calicut

      An inverter is a luxury in such cases. There are DC emergency fans and LED bulbs (with battery) available in market which can last for longer hours with cheaper cost. They would be more cost effective, cheaper, and energy efficient too. Inverter if you run at such low wattage would drain lots of battery on a run of 6hrs.

  • hasan kamal

    dear abhishek
    i am planning to buy microtek inverter 1100va with Exide battery 200ah
    i need to backup time 8 hours.
    4. ceiling fans
    4. cfl
    1. led tv
    & mobile changing.
    sir please recommend.

    • https://www.bijlibachao.com Abhishek Jain

      Typically if you have a fridge you need 2-2.5 kVA inverter. This is because compressor of a fridge needs more electricity to start. Once it starts, the electricity need comes down. But many modern inverters can handle that momentary surge. Check with your inverter dealer if the model that you have selected can handle the surge or not.

      By the way one 200 Ah battery can not give you 8 hours backup. At max it can give 3-4 hours backup. You need two 200 Ah batteries for up to 8 hours backup. For which you will have to go for a 24V inverter.

    • hasan kamal

      sir, if i use (4, ceiling fans) (6, cfl) (1, led tv) with 1100va inverter battery 200ah enough to backup 6 hours.

    • https://www.bijlibachao.com Abhishek Jain

      1100 VA will be quite big for that because total wattage would be around 500 watts. Which means 650-700 VA should be good enough. Assuming you will use 400 watts (out of 500) at any given time, 200 Ah battery should last for 5 hours.

  • Srikanth

    Very nice & informative..

    I want to know that is there any benefits to use larger capacity inverter than required with lower capacity battery???

    Thank you…

    • https://www.bijlibachao.com Abhishek Jain

      Larger capacity in inverter can help you run more appliances. Larger capacity battery can give you more hours of backup. The two are quite unrelated. When manufacturers specify ideal battery size, the backup assumed is 4 hours for ideal appliance load.

      But then you can always increase or decrease battery capacity to increase or decrease backup time. You just have to make sure that the total voltage supplied by the batteries is equal to that needed by the inverter.

    • Srikanth

      Thanks lot for such a valuable reply,

      I plan to buy 2 kva inverter which says two battery / 24v then can I use with single 12v 180Ah battery or should be 2 batteries 12-12=24v I mean is there any switch to make 12v & 24v
      Current load is approx 600w.

      Thank you again..

    • https://www.bijlibachao.com Abhishek Jain

      Hi Shrikanth,

      Firstly 2 kVA is a huge system for 600 W load unless you have an appliance that has a motor. Secondly if your inverter is 24 V, then you cannot make it work with single battery. You need two batteries. If you want 180Ah backup, then you may go for Two 80 Ah or Two 100 Ah batteries. But you will have to go for 2 batteries.

    • Srikanth

      Thank you for sharing your wisdom with us.

  • Santhosh

    Thank you for providing such valuable insights.
    my requirements for my 1 bedroom house with single phase are:
    2 fans
    2 tubelights and
    1 LED TV(40 inches) with HD set top box.
    my own calculation for 6 hours of back up came to 289 Ah and 3468 VAh.

    but only 200 Ah max is available in the market.
    can you please suggest a good inverter+ battery?

    • https://www.bijlibachao.com Abhishek Jain

      You will have to go for two numbers of 150 Ah batteries for your use. And for that you will need a 24V inverter (because there will be two batteries of 12V). The smallest 24V inverter would be about 1400 VA inverter. Would suggest you to look at 1400 VA/24V models from Sukam, Luminous, Microtek.

    • dr.neeraj

      Plz send u whats app num

  • Ujjawal Kumar

    Hii All.
    First of all I would gladly thank all experts here at bijlibachao for such a commendable work on important facts.

    Now my current scenario:
    I have a 1yr old 1600va inverter (Sukam Falcon) and what I am noticing is that whenever the compressor of the refrigerator starts the inverter gives a beep for 1-2seconds(may b bcoz of starting surge) and then everything is fine. After the compressor is started/steady there is no beep. However When I turn on air cooler the inverter overloads, if compressor of refrigerator is running, otherwise everything is fine and it doesnt even beep.

    From my understanding, this above behavior is based on the nature of Toshiba refrigerator’s compressor. But my question is: what the inverter manufacturers say about inverters is that most inverters are designed to handle overload for a few amount of seconds (10-15) before tripping so a 1600va inverter can handle 2KW of load for 10seconds before tripping and 1200watt of continuous load without any problem. I am not able to understand how much load is my refrigerator drawing so that the inverter is not even able to last 10seconds before tripping?
    The Toshiba refrigerator is about 7yr old, frost free, sizing 270l and is non-iverter tech.

    I am planning for solar expansion within a two month period i.e. to increase current 500watt solar power to 1500watt and also replace the inverter by Luminous SineCruze 2KVA.

    So, By using 2KVA (copper based) inverter will I be able to do the following or should i go for 2.5KVA (36v)?

    1. Run an air cooler+non inveter tech Fridge+3fans(70w each)+2LED TVs(both 100w each)+5LED bulbs (12w each)+ 2or 3 mobiles chargers

    2. Adjust the load by turning of Fridge,cooler etc and Run a 1Ton 5 star AC(non inverter) alone in daytime as the inverter will get charged by Solar power(1500watts).

    2. Switch everything off in Night and Run a non-invertertech 5star 1 Ton AC (O.General EER 3.53) alone. I am happy if the inverter beeps for 2-3 seconds but does not trip. My typical plan would be to run the AC for about 30min so the room cools then switch it off so the battery lasts whole night (in case if Mains go down).

    Also I’ve a few more questions ?

    1. How much surge does Inverter Tech ACs and Fridges require e.g. a 1ton invertech AC costing about 40k, how much starting current will it need? is it exactly same as normal running current? can a 1 ton invertech AC along with 2 fans and 1 LED TV be run by a 2KVA inverter ?
    2. Does the star ratings or EER rating of ACs effect there inrush starting surge ? for e.g Does a 5 star non-inveter AC require lesser starting surge then a 1star or 3star non inveter tech AC ?
    3. Does the Summersible water pump (Rated as of 1HP = 746watts) also require more load to start the motor?
    4. Generally the ACs (non-inverter Tech) use 15A plugs and internel wiring of the sockets is 4mm for them but the inverter’s phase wire is of 2.5mm in houseline so can a 2.5mm wire be used to run a 1 ton non inverter tech AC ? or will it require a changing/work around like having a seperate direct supply line right from inverter to AC?
    5. I heard somewhere that The inverters using copper based transformers have higher power factor and can handle more peak load (overloading bandwidth) before tripping – is this statement true ?

    • https://www.bijlibachao.com Abhishek Jain

      Hi Ujjwal,

      Firstly I would say if you want really accurate data, you should try measuring your appliances by using an energy meter. You can check this (and similar ones) on Amazon: http://amzn.to/29m78jN …. This model can handle upto 15 Amp or can easily help you measure a 1.5 ton AC. You can get VA value for load, max current, etc. This can help you exactly size your solar PV system.

      Now to answer your questions:

      1) Typically we suggest a 2.5 kVA inverter for a refrigerator. Smaller ones may be able to handle it (as newer ones can handle surges) but 2.5 kVA can safely handle it.

      2) Your 1st scenario can be handled with 2.5 kVA inverter.

      3) You will have to check if 2.5 kVA inverter suits your 1 ton AC. Typically for 1 ton AC we suggest 3.5 kVA to be safe. Also if you use AC on inverter, you would need lot of storage (i.e. battery) as total energy consumption of ACs is quite high (A 1 ton old AC may consume about 1 unit in an hour …. your 1.5 kWp solar PV would only produce max 6-7 units in a day)

      4) Inverter Tech ACs and Fridges do not have any startup surge. They steadily start at low current and gradually increase to peak current. So for e.g. if you have a 1 ton non inverter AC, it may start at 14-15 Amp and settle at 5-6 Amp. But an 1 ton inverter AC would start at 1 Amp and gradually increase to 6 Amp (just an example), and then may be get steady at 3-4 Amp. It will not go beyond its peak rated power. Even if it does it would not be more than 10-20%, while a non inverter AC can start at 2-3 times its steady state current. You can certainly run a 1 ton inverter AC on 2kVA inverter (along with fans and LED TV).

      5) Star rating does have an effect on starting surge. Power consumption is lower for 5 star rated AC and thus its peak requirement is less. And so the starting current is also less.

      6) Any motor will require more load to start. So even a 1 HP pump will need 2-3 times more current to start. To give you an analogy, if you are on a bicycle, when you start cycling, you have to put more efforts to start. But once you start moving, efforts to keep it running goes down. Similarly, any motor (non VFD) needs more effort to start running. And that is where VFD or Variable Frequency Drive or Inverter Technology saves the effort.

      7) Smaller wiring can lead to voltage drops, however 2.5 mm wire can handle up to 10 Amp current. 4 mm can handle upto 16 Amp current. Ideally steady state current of 1 ton non inverter AC shoudl not exceed 10 Amp. But if it gets more than 10 Amp, you will observe voltage drops. But I think 2.5 mm wire should be able to handle 1 ton non inverter AC.

      8) Copper windings are always better. It can certainly give you better power factor.

    • Ujjawal Kumar

      Thanks a lot for answering:)
      I’ve few more questions:

      1. Pls tell me does heating elements like Geyser or Ironbox or Induction Heating coil for cooking also have similar nature of requiring High initial Current at start ?

      2. Can I run a 2KW Geyser on a 3.5KVA inverter along with few led bulbs & no fans (as in winter fans are off)

      3. If i replace my existing 24v inverter by a 48v one then can I use the existing batteries with newones ? The current batteries are 150AH Sukam Bazooka exactly 1yr old and well maintained.

      4. For a 48v inverter can I employ 2 batteries of 150ah & 2 batteries of 200ah to attain 700ah backup in total ? Or the AH of all da 4 batteries be same?

      5. Also the brand of all the batteries should be same? One of Sukam & one of Exide ? Not good?

    • https://www.bijlibachao.com Abhishek Jain

      Here is my response:

      1) High surge is only needed for motors and not for inductive load. So your geyser, iron box and induction heating coil will not have high initial current. They may have high steady state current just because they are high wattage appliances, but then do not need more to startup.

      2) You can certainly run 2 kW geyser on 3.5 kVA inverter. In ideal state 2 kW geyser should be equivalent to 2 kVA … worst case it would be about 2.2 kVA.

      3) Better to not mix old and fresh batteries. Output of batteries go down with time and if you mix then the overall output will be determined by the output of old batteries. So effectively you will be able to extract less from new batteries.

      4) A 150 Ah battery has lower output as compared to 200 Ah, and thus mixing the two will result in output of about 150 Ah from 200 Ah battery. I am sure you would not want to waste the extra resource that you have paid for. Ideally all batteries should be of similar age and similar Ah value.

      5) Although not very important, but it is better to have same brand.

    • Ujjawal Kumar

      By output of batteries do u mean overall backup ?

    • https://www.bijlibachao.com Abhishek Jain

      That is right. For e.g. if a new battery may run for 4 hours after full charge, an old one may run for just 3 hours after full charge. If you mix a new and an old, you will get only 3 hours backup because the old one will die down in 3 hours and because it is part of the circuit, the energy stored in new one will not be used at all after 3 hours.

    • Ujjawal Kumar

      Thanx a lot for ur time.

      My One last question: My 1 ton AC (noniverter) is connected to a 4Kva stabilizer. Can I connect this to a 3.5Kva inverter using stabilizer? I mean 4Kva stablizer getting connected to 3.5Kva inverter will not create any overloading or mismatch ? I really don’t want to burst the transformer of either of the appliance.

    • https://www.bijlibachao.com Abhishek Jain

      All depends on how much current the AC draws at peak load. 3.5 kVA means at 220 V, max current that your inverter can supply is 3500/220 = 15.9. If at any time your system (which includes your AC) draws more current, the inverter will not work. Depending on power consumption of your AC, it may or may not draw that much current. You will have to test it out. In general 4 kVA inverter would be safer to use with 1 ton AC. Also because power consumptions of ACs are higher, it is generally recommended to use AC with Diesel Gensets rather than Inverter. Max that I have seen is inverters supporting 0.75 ton AC.

    • Ujjawal Kumar

      No no actually 1 ton AC does work on 3.5KVa inverter easily but the point is that can a 4 KVa stabilizer be connected to the inverter or should the AC be directly connected without any stabilizer in between AC and inverter? Does use of stabilizer effect the current being drawn from the power source?

    • https://www.bijlibachao.com Abhishek Jain

      I do not think there should be any problem in putting a 4 kVA stabilizer in between a 1 ton AC and 3.5 kVA inverter. The current will be determined by the AC and not by the stabilizer. 4 kVA is just the limit to which it can handle. But the actual current will depend on the AC. There may be small amount needed for the stabilizer, but it will be too small in front of the current drawn by the AC. So I would say, it should work fine.

    • Fawaz

      Very Nice set of questions but I dont have the answers :P
      you really need an expert like Abhishekh Jain.


    Very knowledgeable information for us. Thank you so much.

  • aman

    I have to by inverter battery system which one will be best the load is
    2 fans 1 led tv 3 cfl 3led lights and laptop charger point and cooler so which one i should go for! Budget is near 15k to 25k

    • dr.neeraj

      You mobile num

    • Jamal Moram


  • Mirana

    Can I use a tall tubular battery along with my sonic PBX 1500 which I think is semi-tubular(?) for my 1.5kva inverter? Both my batteries were pbx 1500 but now one is dead and I want to replace it with a full tubular battery. Do I have to replace both?

    Also great site, thank you.

    • https://www.bijlibachao.com Abhishek Jain

      Would not recommend to mix old and new batteries. Output of a battery goes down with time and if you mix two then the one that has lower output will drive the actual output.

  • dev

    Which battery is best between exide inva master IM10000 36 month warranty and amron tall tubular 48 month warranty.

    Also tell about market price of both.


  • om samantaray

    my basic requirement is 5 no of 12w led bulb with 3 fans and 1 32″ lcd with standard set top box. Also 3 5a charging points.
    n I have brought zelios 1100va, with ILTT 26048 220AH battery. Is the combination okay ?? Regarding battery i have a doubt is of charging time. How much time will it take to charge fully. And also the discharge rate of it . Kindly reply me with ur wisdom.

    • https://www.bijlibachao.com Abhishek Jain

      Typical charging current is about 13 Amp. So if you have a 220 Ah battery it will charge completely in 220/13 = 17 (about 17 hours).

      A lot depends on what you put on those 5 Amp charging points. Will they be used just for phone/laptop or will you put a heavy appliance on it?

      You have total of 1100VA ….. LEDs is 60 Watts, 3 fans would be 270 Watts, LED TV would be another 60-70 watts. So in total you have 400 Watts which means even a 500-600 VA system would be more than enough. So you have about 500-600 VA extra that you can support. If it is just mobile phone chargers and Laptop Chargers on the charging points, then it would be easy. But if you put anything big (with a motor in it), then it would be difficult to run that. 220 Ah battery can give you 5-6 hrs backup, but then it would take 17 hrs to charge.

  • Ashraf

    Hello, ur blog helped me a lot to understand about the inverter and battery system buying guide.
    I’m thinking of buying a 150Ah battery and a 800/900 W inverter. So, can u recommend a good brand for the combo/individual system, I’m kind of confused to go for which brand in inverter and battery and I’m from kerala.

    Thank u

    • https://www.bijlibachao.com Abhishek Jain

      Hi Ashraf,

      Sukam, Luminous, Microtek are great brands for inverters. Amaron, Exide are great brands for batteries. However all these 5 brands sell both inverters and batteries. They also sell their own inverter battery combo. If you buy combo then you can get better warranty and maintenance.

  • Sam

    Hello Abhishek,
    First of all thanks ever so much on very informative post. I learned something today :)
    I have gone thru the calculation like many others and come up with what I think is needed. 10*LED lights,1*Tv, 4*Fan,1*Set top box,1*Wifi router,1*Fridge = ~900watts –> ~1100VA
    So based on this I was thinking of Microtek SEBZ1100 or UPS – SWE²+ 1115VA
    But my main problem in deciding is
    1) Inverter companies market with plethora of acronyms as a marketing gimmick, so which are the real features which add value(or really matter) rather than just a feature for the sake of it.
    2) All combo inverters come with single battery so when I say I need 6 hrs back up then, from above example I need 1100*6/12= 550Ah—->which means I need 3 nos of 200Ah batteries. So how come they are saying that I can get 6hrs backup just by using a single battery in a combo pack.
    3) Thirdly and this may be because of lack of knowledge on electrical, but the specifications for inverter are very confusing. You mentioned about 24V battery but I dont know where in the spec book it refers to 24V. Its just tech jargon to confuse common buyer.

    So can you please help in distilling this in to few critical features we need to look for and how to interpret the tech spec for inverter. The sales guys from inverter company would just throw few acronyms and try to sell useless features to generate sale.


  • Chanki Shaad

    What is procedures for new connection in my home… economicAl as well as safe
    For 2 ceiling fan 2 tube lights and 1 changer 1 router plug.

  • Rahul

    Hi abhi which combo is better…Sukam inverter+autobat batteries. Or. Microtek inverter+ Amaron batteries……or any other combinations suggested

    • https://www.bijlibachao.com Abhishek Jain

      Sukam is a better inverter company and Amaron is a better battery company :)

  • royston

    Hi abhishek,
    Quick question, I am new to this. I would like to know about the wiring. Can this be hooked up directly to the current wiring system or will there have to be a separate line laid out?

    • https://www.bijlibachao.com Abhishek Jain

      Are you trying to put a new inverter system? If yes then it can be hooked to current wiring system.

    • royston

      Thanks. My basic requirement is 10 tube lights+ 06 fans+ 2 x 5A charging points + 1 fridge ( If possible).
      I have narrowed it down to a Luminous Cruze 2KVA + ILTT 18048 150Ah Tubular Battery ( 2 batteries)
      Would you suggest this set up. this is taken in consideration that my requirement might go up.

    • https://www.bijlibachao.com Abhishek Jain

      All depends on how long do you want the backup for. Just tubelights and fans would be total 1.1 kW. Assuming 70% are on at any time it would consume 0.7 units in an hour. Fridge would be another 0.1 unit in an hour. Assuming 1 unit consumption per hour, two batteries of 150 Ah would give 3 hours backup. 2 KVA should be fine for the setup.

  • Medy Karattong

    Hi Abishek,

    Thank you for sharing your knowledge, I want to apply it in my house.
    Following your mathematical theory, I found total power about 1800 watts, than i want backup for 5 hours, the result is need battery with 756 Ah.
    I want to purchase an inverter luminous 2500 VA / 36V and 3 battery 200mAh in series, or maybe you have another suggestions.

    Thanks in advance.

    • https://www.bijlibachao.com Abhishek Jain

      Hi Medy,

      Your calculations are right. You can go ahead with 2500 VA/36V 3 battery 200 Ah system. Just keep in mind that the charging time will be about 10-12 hrs.

  • Ajit Jadhav

    Hi Abhishek,

    Thank you for sharing this valuable information for your website visitors.

    At my place we face frequent power cuts multipal times a day some time power wont be available for 6-7 hrs also.

    I want to use 2 LED lights of 20 watt = 40 watt
    1 Tube light 50 watt = 50 watt
    2 Fans = 180 watt

    I will need the power backup of at least 6 hours also please suggest a battery or an inverter that charge battery faster.

    • https://www.bijlibachao.com Abhishek Jain

      Your total wattage is 270 Watts. Which means in 6-7 hrs you would need 1.6-1.8 units of electricity. Going for a 180 Ah battery would be safe. Also 450 VA inverter would be more than enough for your needs. But for faster charging, it is better to go with bigger inverter. So 800-850 VA with 180 Ah battery should be more than enough for you. Try to go for a single brand inverter battery combo. Sukam, Luminous and Microtek are leading inverter brands.

  • chandan das

    4 LED Lights(7 watt)- 28 watt
    2 Celling Fan(100 Watt)- 200 watt
    1 Led 36 inches TV( 100 watt)- 100 watt
    1 setup box Normal( 10 watt)- 10 watt
    Total 338 watt
    VA required 338/0.7=482 approx 500VA

    for 8hr back-up 500*8=4000
    for a 12V batt. 4000/12=334Ah i,e 180Ah X 2

    so i have to buy a 500VA / 2Nos-180Ah connected serially to inverter
    is that correct ???

    • https://www.bijlibachao.com Abhishek Jain

      For two batteries you need a 24V inverter to connect batteries in series. With 500 VA inverter you will have to connect them in parallel but then the time taken to charge completely will double up.

      Smallest 24V inverter would be a 1400 VA inverter. A single 180 Ah battery will charge in 180/12 = 15 hours.

    • chandan das

      Thank you Mr. Jain
      so i shall purchase 24V inverter of 1400 VA rating with two batteries of 180 Ah connected in series with the Inverter system

  • Abhishek Kumar

    Hi Abhishek,
    My requirements are for a 3 BHK, 5 tubelights, 3 fans,refrigerators and a TV. I am looking for 4-5 hrs backup. what shd be the ideal battery and ups


  • ashvini

    Exide Launches SF Sonic Batteries and now those on direct sale. Exide do not sale batteries, customer has to buy from Shop or retailer or dealer. Now, Exide has Power Bay store and from here you can directly buy batteries from Exide SF.

    This is for those who do not know:
    SF Sonic is Exide Battery devision that launched for high performance batteries. You can find your self on Exide Official web site, there is link for SF sonic. Also for new launched Power Bay Store (for Direct sale of battery, you can click on Power Bay store of SFSonic official web site.

    Here is the link of Power Store to buy:

  • balaji

    My home Inverter has few micro seconds delay. when power is turned off, inverter switching to battery has some delay. For eg: My TV turned off and turned on back after the power. Could you tell me what would be the reason? I am using Exide Inva Master 150Ah battery and V-Guard Ei Power 600 Plus.

    • https://www.bijlibachao.com Abhishek Jain

      Is it happening since the beginning (when you purchased the inverter) or has it started happening lately (due to a defect that may have come up)? Typically inverters have a switchover of microseconds, but then it varies from inverter to inverter. Vguard company should be able to find the real reason.

    • Balaji

      Thanks Abhishek. It has started happening lately. When I purchased the inverter, I did’t have this issue. Could you guess what would be the defect.

    • https://www.bijlibachao.com Abhishek Jain

      Not really. But it certainly looks like a defect that has started happening now. I think you should call up VGuard helpdesk for the same.

  • Thabraiz UL Aalam

    my need for a clinical lab is one desktop with crt,one desktop with lcd,40w tubelights(4nos) 12w led bulbs(2nos),analyser(140w) from above info ,just did a rough calculation.
    CRT SYSTEM-250
    LCD SYSTEM-150
    LED BULBS-12*2-24
    VA NEEDED-724/0.8=905VA
    FOR TWO HOUR BACKUP-905*2=1810

    • https://www.bijlibachao.com Abhishek Jain

      Your calculation is correct. 1100VA model with 150 Ah battery should work fine. You can look at models from Sukam, Luminous or Microtek. These are good brands in Inverters.

  • http://www.sherlockholmes-fan.com/ Meghashyam Chirravoori

    Hello. Thanks so much for the amazing information about inverters and batteries. It has helped me a lot.

    I have a question. I am planning to buy a Sukam Shiny home
    inverter and an Exide Powersafe SMF battery. Is that fine?

    Some inverter dealers have told me that Exide Powersafe should not be used
    with home inverters and it will lose its warranty.

    Which SMF battery would you recommend with a home inverter?

    I’d be really
    grateful for any advice in this regard.


    – Meghashyam

    • https://www.bijlibachao.com Abhishek Jain

      HI Meghashyam,

      In general SMF batteries are not recommended for use with inverters. These days inverter + battery combo from the same brand is a much better option as brands provide good warranties (3 years + ) on combos. Also as part of warranty, they send technicians to do regular maintenance of the system (battery + inverter). So you need not worry about the maintenance of the battery. And well maintained tubular batteries last long. I would suggest that you go for a inverter battery combo from Sukam.

  • Abhinandan Choudhary
  • Ayaan

    Hi Abhishek,
    Could you please suggest the inverter and the number of batteries that I should opt for the following:
    Tube Lights – 6
    Ceiling Fans – 4
    LED 43″ TV – 1
    Set top Box – 1
    Laptop – 1
    Router – 1
    Backup Required for 6 hours.

  • srikanth chary

    hello Abhishek sir,
    afterall a survey in the market i am just confused which inverter and the number of batteries to buy can u help me out in choosing a right inverter, batteries with their ratings as per my requirements

    i want to run 4- tube lights, 4-fans, 1-led tv of 32inches with HD box, and one refrigerator of 510liters and it is an inverter model
    i want to run all these appliances for 3-4 hrs.

    • https://www.bijlibachao.com Abhishek Jain

      Total load would be about 1 kW, but then electricity consumption may reach to about 3 units in 4 hours. So a 1400 VA/24V inverter with two 150 Ah batteries should work.

  • Ankur Jain

    Hi Abhishek,

    I want to install an inverter to achieve the following –

    Total Hrs. of backup – 8 Hrs.

    1. 4 Fans
    2. 4 LEDs Lights 7watt
    3. Refrigerator (180 Watt)
    4. LED TV
    5. 2 Mobile Charging Points

    Please suggests which one i should buy. My location is Pune. I am looking to buy today/tomorrow

    Ankur Jain

    • https://www.bijlibachao.com Abhishek Jain

      Hi Ankur,

      You should go for a 1400 VA/24 V inverter as you would need two batteries at least to support 8 hours. You would need two 180 Ah batteries. These batteries will get charged in about 14-15 hrs.

  • naqshpa

    i want o run gyeser + lights on an inverter. is it possible or would i need to use a generator. Also can a generator be used in flats?

    • https://www.bijlibachao.com Abhishek Jain

      You can certainly run geyser + lights on inverter. But then a huge inverter will be required for a geyser. And typically large inverters can work only on big array of batteries. And you may not need that much batteries as I guess your usage of geyser will not be for hours and hours.

  • saurav

    Hi Abhisekh,

    This article is really informative. I have 2 questions to you please..

    1) I have a luminous modified sine wave inverter and I have recently baught a 50 inch LED of micromax. Now I am worried about the TV. My area is a heavy power cut area. So I use this TV frequently with that inverter during loadsheding. Do you suggest me to change the inverter to a sine wave inverter or just I can keep it like this, as the TV has 3 years warranty.

    2) My voltage goes as low as 120 V for these peak 3 months. If I put a 1 kva stabilizer in front of my 875 VA inverter, then can I get stabilized output in the lines where the inverter is connected. There is no problem of voltage when inverter is on.



    • https://www.bijlibachao.com Abhishek Jain

      Here is my response:

      1) Modified SINE wave inverters are not good in general for electronics. It will be better if you go for a SINE wave inverter.

      2) You can certainly put a stabilizer in front of an inverter.

  • abhishek khanna

    Hi Abhishek Jain,

    I am planning to purchase SU -KAM 3.6 KVA Fusion invertor with 4 SF Sonic Stan Master 10000. In my area, power cut is even more than 24 hours sometime. I want to run laptop for 8 hours with one cooler 200watt Kuntocom Supreme DX, 1 fan and 1 LED 10watt for upto 30 hours. Please suggest if this will support.

    • https://www.bijlibachao.com Abhishek Jain

      A laptop is 50 watts and that along with a 200 watt cooler would make 250 watts. In 8 hours it would consume 250×8=2000 Wh or 2 kWh or 2 units of electricity.

      A fan would be at max 90 watts. That with 10 watts LED would make 100 Watts. In 30 hours, it would consume 30×100=3000 Wh or 3 units of electricity.

      So in all you need to store 5 units of electricity. You are going for 4 numbers of 150 Ah batteries, which would store at max 1.5×4=6 units of electricity. Which should be good enough.

      For 4 batteries you need 48V inverter. Sukam 3.5 KVA inverter will be 48V, which should again be good enough to support 4 batteries.

      Although with 3.5 kVA you can add lot many appliances, but then to support for 8 hours and 30 hours, you need that much. Please note that it will take about 10-12 hours to charge the batteries.

  • saurav suman

    hi sir, my need is 2 led bulb each of 14 watt, one laptop without any battery backup(means need continuous power supply, 8 year old laptop) and one cooler (usha cooler (CL601PM) 165 W as it is mention on the product) for 5 -6 hour, there is continuous power cut in my area .power remain hardly for 10 hour. so please suggest me good inverter battery combo. i am looking for exide invatubular (IT 750) 200 ah battery and exide pure sinewave ups 1050 va , will it be good to opt for this combo. please suggest me.

    also sir there is voltage fluctuation and low voltage problem in my area so which stabilizer should i opt for and of what rating

  • mohan

    could u suggest an inverter and battery combo for 1 fan 1 tube light 1cfl 1tv and a port for charging mobile and laptop, back up for 4-5 hours

    • https://www.bijlibachao.com Abhishek Jain

      A 450 VA inverter with 120 Ah battery should be good enough for your needs. Sukam, Luminous, Microtek are good with inverters, Amaron, Exide are good with batteries.

  • David

    Hi Abishek, I am planning to buy àn inverter set pls help me out. I am using maximum of 600wt, not regularly. I need 4-5 hours backup. What battery and inverter do you suggest? Someone refer tall power zone 150ah, is this good brand or enough for 5 hours? Or what should i buy for 5 hours back up? Thanks!

    • https://www.bijlibachao.com Abhishek Jain

      600 watts for 5 hours means 600 x 5 = 3000 Wh …. or 3 kWh or 3 units of electricity.

      Which means if you go for two 180 Ah batteries it would be perfect … or if you are tight on budget then two 150 Ah batteries (which would be optimized to store 3 units of electricity).

      As you need two batteries, you need a 24V inverter (12V for each battery). Smallest 24 V inverter would be a 1400 VA inverter.

  • Brar Col Hs Brar

    I am planning Roof Top Solar Power Project. I am to choose between Su kam 3.5 KVA 48 v fusion UPS and Su Kam 3 KVA 48 V PCU.
    Kindly advise which one shall I choose?

  • Amol Adat

    Hello Abhishek Sir ! Can I connect Luminous Zelio 1100 pure sinewave inverter with single Luminous tall tubular 220 ah battery ? Is it right combination ? Reason behind to buy 220 ah battery is long battery backup . I have 2 bhk home . [ 4 Tubes , 1 Television set , Videocon HD set top box , 2 celing fans , 0.5 HP motor for water need , Kent Grand plus water purifier ]

    • https://www.bijlibachao.com Abhishek Jain

      Hi Amol,

      220 Ah battery can store about 2-2.2 units of electricity. Which is 2200 Wh of electricity. Your total load would be 220 (for tubes) + 100 (TV+HD Set top box) + 180 (Ceiling Fans) + 350 (Motor) + 60 (Water Purifier) = 910 Watts.

      Now a lot depends on how much you use these appliances for. If you use all of them together for some time then 2200 Wh will last for 2200/910 = about 2-3 hrs. But I doubt you will use the motor all the time. Also other things will also not be used for all the time. My guess is that it would give you 4-5 hrs of backup.

      Looking at Specs of Luminous Zelio 1100VA, I think it should be good enough for your needs. Just make sure that you need just 4-5 hrs backup. Also note that 220 Ah at a charging current of about 13 Amp would charge the battery in 220/13 = 16-17 hrs.

    • Amol Adat

      Thank you so much Abhishek Sir for your valuable opinion.

  • Prasad AV

    Hello Abhishek. I need to better understand the battery configurations.
    1. Can I mix in series my two old 88AH batteries with two new 180AH battries in a new 48v inverter
    2. Can I mix in parllel my two old 88AH batteries with two new 180AH battries in a new 24v inverter
    3. Can I connect only 2 12v 88AH batter to a 48v inverter?

    • https://www.bijlibachao.com Abhishek Jain

      Be it parallel or in series, to get the best output, the internal resistances of the batteries have to be the same. If you mix then the lowest size will drive the output. You will get output, but it will be lower than expectation.

    • https://www.bijlibachao.com Abhishek Jain

      Hello Mr Prasad,

      I would not suggest mixing of battery sizes. Reason being that the output will be determined by the smallest battery. If the voltage of 88 Ah battery drops, current will also not flow from the 180 Ah battery. So effectively the output from 180 Ah battery would be similar to that of 88 Ah battery (as the current drawn from all the batteries would be same, but the internal resistance of both batteries would be different). The system will work because both are 12V batteries, but then the output will be as much as 88 Ah. So here is my answer:

      1) No
      2) No
      3) No because you need 4 12V batteries for making 48V.

    • Prasad AV

      Thanks for your answers. Can I mix 2old 88ah batteries(6yrs old) with 2 new 88ah batteries in series for a 48v inverter. I ask this because the batteries are good and I want to reuse it. I don’t want to throw it at dirt cheap prices.

    • https://www.bijlibachao.com Abhishek Jain

      Again adding two old and two new will work, but is not recommended, because internal resistances of old batteries would have changed over time and those of new ones would be different.

    • Prasad AV

      Thanks. I have made a decision to retain the old batteries with 1.6kv falcon plus inverter. I have a 3kv electric meter so I assumed that the lighting load of not more than 1.5kva. Also the wiring for lighting may not support 3.5kva peak load. So I was forced to go for lower kva.


    Sir My power requirement is 500 watt and i neet back up of 6 hower in my area there is long power cut of about 10-12 hours so what rating of invertor and battery will be suitable for me pls reply

  • Ganga Suru

    hi abhishek.. good article, gained knowledge…
    still confusion with choose inverter.. can you help, i have two workstations and one fridge.. which runs continuously… i need three hours backup in most critical case., nothing else i want to use with inverter.. can you suggest good inverter

    • https://www.bijlibachao.com Abhishek Jain

      Hi Ganga Suru,

      You can go for a Sukam Falcon + inverter (900 VA or 1100 VA both will work). This along with a 150 or 180 Ah battery should be more than enough for your needs.


      Sir My power requirement is 500 watt and i neet back up of 6 hower in my area there is long power cut of about 10-12 hours so what rating of invertor and battery will be suitable for me pls reply

    • https://www.bijlibachao.com Abhishek Jain

      500 watts for 6 hours makes it 3000 Wh (= 500 x 6) … which means 3 kWh … so you need batteries to store 3 kWh …. which would be two 180 Ah to be on safe side or two 150 Ah (bit agressive). ….. and to support two batteries you need a 24V inverter (12V for each battery)….. smallest 24V inverter that you would get would be 1400VA.

  • Dorjee Wangdi

    Hello Sir i read your article and it was very usefull. I need a favor sir i am planning to buy a invertor which can run 1Led tv 15inch, 1 table fan, 8 CFL bulb 18w and charge a laptop plus i want it to last for atleast 2weeks so can u suggest me which invertor i should buy with how many betteries??

    • https://www.bijlibachao.com Abhishek Jain

      Hi Dorjee,

      If you want the setup to run off grid for 2 weeks, then the best solution is to either go for a Diesel Generator set or on solar (even Solar is doubtful, but DG should certainly work). I do not think inverter will work in your case as batteries cannot store that much energy that it can run for 2 weeks.

    • Dorjee Wangdi

      What if i use 2 or more batteries then will it work..??

    • https://www.bijlibachao.com Abhishek Jain

      The biggest batteries that are available are 220 Ah batteries. Each 220 Ah battery can store about 2-2.2 units of electricity. Two batteries can store 4 or 4.4 units of electricity.

      Your LED TV would be about 30 watts. Assuming you use it for 5 hrs a day, it would consume 30×5=150 Wh per day. In 14 days it would consume 150×14=2100 Wh or 2.1 kWh or 2.1 units.

      Table Fan would consume 50 watts. Assuming you use it for 10 hours a day, it would consume 50×10 = 500 Wh per day. In 14 days it would consume 500×14=7000 Wh or 7 kWh or 7 units.

      8 CFL bulbs of 18 W in 6 hrs a day would consume 8x18x6=864 Wh per day. In 14 days it would consume 864×14 = 12096 Wh or 12.096 kWh or 12 units.

      Laptop would consume 50 watts. Assuming you use it for 10 hours a day, it would consume 7 units in 14 days.

      So total you need is 2 + 7 + 7 + 12 = 28 units. So you need at least 14 batteries.

      To support 14 batteries you need 12 * 14 = 168 V inverter (each battery is 12 V). There is no inverter in market that can support so many batteries.

  • Sohail Merchant

    Hi Abhishek,
    Please suggest me a long life & good battery. I need a battery to use for 3 fans, 5cfls, 1tube light,1PC (LCD monitor-21inch), 1 LED (40inch). Please advice me what would be a better options. In my area there is lot of electricity issue (Load Shedding). I need back for apprx 4-5 hrs. And, one more thing not everything will be turned on at once apart from LED & PC (sometimes not always), 2 fans, 2 CFLs (always). I had taken batteries in the past but their life was only till 3 yrs. After 3 yrs they were of no use. Thanks a lot in advance.

  • Ankit Kumar


    I have a 1 PC with 1000W consumption, 1 Laptop and a light 14 W, Can you suggest what inverter power is enough ? I want only PC only to run for 4-6 hr in worst case.


    • https://www.bijlibachao.com Abhishek Jain

      Are you sure your PC consumes 1000 W??? It’s unrealistically high. Typically PCs consume about 120-150 Watts.

  • Rohit kumar

    Sir what is difference between 32 bit DSP processor used in luminous zelio and 4th generation 44 pin micro processor used in sukam falcon + .Sir plz tell me which one is advanced and best

  • Siv

    Hi Abhishek,
    I’ve just started researching on inverters and this morning almost zeroed in on Sukam falcon + (1050 VA – dealer said 1100VA would take ages). How ever this evening I met a Microtek dealer who quoted me around 4000/- less for a similar configuration and said Microtek was the best and Sukam was dying (especially here in Hyderabad ).

    Now I’m very confused. Is Sukam really fading away? I need advice on which of these combinations would work out best:

    A) Sukam falcon+ 1050VA + SUKAM 180 Ah with 4 yes warranty at 19.5k/-
    B)falcon+ with exude inva 180 Ah?
    C) Microtek 1100VA with 150 Ah for 4k less?

    My usage would primarily be 2 LCD bulbs + 2 fans + very rarely LCD TV + WiFi modem for as long as possible.

    Appreciate your timely advice. Thanks.

    • https://www.bijlibachao.com Abhishek Jain

      I do not think Sukam is fading away. He is just trying to sell you microtek. I think Sukam is a good brand with great products. I would say go for Sukam inverter with sukam battery.

    • Siv

      Thank you Abhishek. I finally found a distributor closer to the area where I live and invariably went with a Sukam Falcon + 1100VA and Exide Inva Master tubular batteries (150 AH).

    • Siv

      Thank you for the assurance. The only bit i’m trying to decide is – Sukam 1100VA is unknown to the distributor and online – it takes at least 7 days. Nevertheless, I’ll probably go for Sukam then if he promises good service.

  • Rohit kumar

    Sir, i am confused between sukam falcon+ 1600av ,microtek hybrid 1600av & luminius zelio1500av.
    I have no budget issue .I want best inverter with best battery backup(10-12 hrs) especially.
    Plzzz sir guide me
    I want to run 1 19′ lcd tv + 5(25w) cfl + 3fans + 1 room cooler(when needed)

    • https://www.bijlibachao.com Abhishek Jain

      Sukam Falcon+ is a great inverter.

    • Rohit kumar

      Sir what about its battery backup and charging…
      In its manual written 2hrs backup for 150ah battery using 10 tubelights+ 2 cfl (for 1100av model)
      Plz tell me why its low??
      Is luminous zelio 900av has better battery backup and managment??

    • https://www.bijlibachao.com Abhishek Jain

      A 150 Ah battery stores about 1.5 units of electricity. 10 tubelights would be 10×55=550 Watts. Two CFls would be about 50 watts more. So total would be 600 watts. Total of 600 Watts in 2 hours would consume 600 x 2 = 1200 Wh or 1.2 kWh or 1.2 units of electricity. So a 150 Ah battery would support 10 tubelights and 2 CFL for more than 2 hours but less than 3 hours. And it is not just with Falcon+ …. any inverter with that size battery and that kind of appliances will support only 2 hours.

      The charging for typical 1100 VA model would be at rate of 13 Amp. So a 150 Ah battery will get charged in 150/13 which is roughly about 12 hours.

    • Rohit kumar

      Thanx sir for your reply.Now it has cleared my confussion.
      Sir,One last question
      In my area there is long power cut for 8-10 hrs.
      So suggest me right combination of best inverter and best battery that can give 10-12 hrs backup for running 6(15W) CFL + 2 ceiling fans + 1 table fan + 19′ lcd t.v(occasionally)??

    • https://www.bijlibachao.com Abhishek Jain

      To get that much backup, you would need at least two 150 Ah batteries. And for that you would need a 24 V inverter. Smallest 24V inverter would be a 1400 VA inverter. So you would need a 1400 VA / 24 V inverter with two 150 Ah batteries.

    • kingsleyuk2003

      Ok, what if he uses 12V inverter, and he connects the 2 150ah batteries in parallel. will Rohit kumar still get up to 10hrs. Or will it be about 5hr?

    • https://www.bijlibachao.com Abhishek Jain

      He can certainly put batteries in parallel, but then charging time will double up. Instead of 12 hours, it would take 24 hours to charge up the batteries.

    • kingsleyuk2003

      ok, so how many hours can he get. Thesame 10hrs or more or less.

    • https://www.bijlibachao.com Abhishek Jain

      Same 10 hrs.

  • Sohail Merchant

    Please suggest me a long life & good battery. I need a battery to use for 3 fans, 5cfls, 1tube light,1PC (LCD monitor-21inch), 1 LED (40inch). Please advice me what would be a better options. In my area there is lot of electricity issue (Load Shedding). I need back for apprx 4-5 hrs. And, one more thing not everything will be turned on at once apart from LED & PC (sometimes not always), 2 fans, 2 CFLs (always). I had taken batteries in the past but their life was only till 3 yrs. After 3 yrs they were of no use. Thanks a lot in advance.

  • David

    I would be using
    12 pc,
    3 ceiling fan,
    6 wall fan,
    4 tubelight
    For my cafe .. which one will be suitable as I ve no idea about this.
    Thank you

    • https://www.bijlibachao.com Abhishek Jain

      You need 3 kVA inverter.

  • nitesh srivastava

    Hi abhishek. i need to run 1 fan, 1 modem, 1 cfl, 1 wireless landline phone and laptop for 8 to 10 hrs. Please suggest optimum inverter and battery.

    • https://www.bijlibachao.com Abhishek Jain

      Go for smallest possible inverter (say 400-450VA) and a 150 Ah battery. Better go for pure sine wave inverter.

  • Ulhas Tilekar

    Hello Sir,

    My requirement is like following

    2 Tubes = 2 X 40 = 80 W
    1 Fan = 1 X 90 = 90 W
    1 Laptop= 1 X 50 = 50 W
    1 Router= 1 X 25 = 25 W
    Total Requirement= 245 W per Hr

    My requirement varies from 6 to 8 hrs (Little pessimistic)
    245 X 6 Hrs = 1470 / 0.8 = 1838 /12 = 153
    245 X 8 Hrs = 1960 / 0.8 = 2450 /12 = 204

    so is it ok to go with following combination and add one more battery (may be after 1 year) if required?
    My friend recommended me for APC 1500 VA as it may take more load in case if we start multiple appliances load and one of best brand in world.
    Please let me know your guidance/suggestions?
    What should be frequency of Battery water check/maintenance?

    APC BR1500G-IN-Backup Power Supply – 13,745/-
    Exide Inva Tubular Inverter Battery 150 Ah – 13,750/-

    Note – APC claims about Power saving upto Rs 2000 per year with this model.

    Links to refer

    Thanks and Regards,
    Ulhas Tilekar

  • Shashwat

    Sir mujhe ek office ke liye inverter battery chahiye.
    Office me 1pc 2 laptop 2 printer 1fan 1cooler 1modem 2cfl light chalana hai sir mai janana chahta hu eske liye kitne battery kitne Ah ka hona chahiye aur kitne VA ka inverter Lena chahiye office ke liye sahi hoga
    Aur kitne RS lagega aur kis company ka inverter battery accha rahega.
    Sir please guide me
    Thanks sir ji

    • https://www.bijlibachao.com Abhishek Jain

      How long do you want the backup for (in hours)? The Ah of battery will depend on that.

  • nidhi

    what is difference between pure sine wave, sine wave ,modified sine wave and square wave ?
    if i use 900va(considering future load requirement) instead of 700va (which is sufficient for my present load requirement) would it have any demerits??

    • https://www.bijlibachao.com Abhishek Jain

      There are only two types: sine wave and square wave.

      Modified Sine Wave and Square wave are one and the same thing. They have lot of harmonic distrortion and are in general not good for use with electronics. With ceiling fans and lights, they add some humming noise when in use. Pure sine wave will not have any noise. Pure Sine Wave is a must if you plan to run electronics.

      You can buy for future load as well. Bigger size may have some additional electricity losses. But then if you plan to add more appliances soon, then it is better to go for bigger one.

  • pravth


    We have power cut approx for 2 hours daily. I would be using, 3 tube lights, 2 fans, 1 setup box, 1 40″ LED TV.,1 port for laptop charging and 1 for Wifi modem charger. Could you please suggest the inverter and the battery I should go for. Thanks.

    • https://www.bijlibachao.com Abhishek Jain

      You can go for a 750 to 800 VA inverter (pure sine wave) with a 120 Ah battery. That should be good enough for your needs.

    • pravth

      Thank you Sir

  • shanmukh

    wow…. this is a nice article…

  • Janvi

    Hi sir, we r in chennai, and here the power cut is for almost 5 hrs, i would like to use
    1 tubelight
    1 cfl
    2 table fan
    190 ltr Fridge , pls suggest me a good inverter

    • https://www.bijlibachao.com Abhishek Jain

      Hi Janvi,

      Do you really want to include Fridge in it? It will significantly increase the size of inverter required.

  • RAVI

    Hi, I recently purchased V Guard DU 800 Plus inverter with 150 AH vguard battery.
    I have 1 TV , 3 Fans 3 CFL to use. The power. Cut is for. 8-11 hrs. But the inverter provides backup for just 4-5 hrs. Pls suggest any solution.

    • https://www.bijlibachao.com Abhishek Jain

      If 150 Ah battery is just providing 4-5 hrs backup then you need two of such batteries to get 8-10 hrs backup.

      But then each battery would be 12V. So your inverter has to be a 24 V inverter to handle two batteries. Typical 800 VA inverter cannot handle 24V. You will have to go for a 1400 VA inverter of 24V to connect two batteries.

  • Aditya Gupta

    hi Abhishek,

    I want to use the following appliances for a 4 hr backup:
    4 fans (90X4= 360)
    4 tubelights (50X4 = 200)
    3 cfl’s (25X3 = 75)
    1 LCD TV (42 inch) (150X1= 150)
    1 HD set top box (18X1=18)
    As per your instructions this comes to 803X 4 = 3212 watt hr or 3.2 kilo watt hr

    The VA of inverter 803/0.7=1147 VA

    The battery size 1147X4=4588 VAh
    4588/12= 382 Ah

    But as the inverter and battery are not available with these exact specifications, what is your reccomended combination of Inverter and Battery apt for my use.


    • https://www.bijlibachao.com Abhishek Jain

      Hi Aditya,

      You may not need 382 Ah battery as you may not use all your appliances all the time. I think 300 Ah should be good enough. In that case you will need two numbers of 150 Ah batteries. Each battery would be 12V, so total would be 24V. And the smallest 24V inverter would be about 1400VA inverter. So a 1400 or 1450 VA 24V inverter with two 150 Ah batteries would be good for you. You can certainly find 1400 VA/24V inverter in the market (Sukam, Luminous or Microtek).

  • Moni.Singh

    need a suggestion from you guys

    3 Fans
    2 A C
    1 Fridge
    1 Oven
    5 Lights

    • https://www.bijlibachao.com Abhishek Jain

      Would not suggest you to run ACs on inverter. Even a fridge would not be good on inverter unless it is a new inverter technology fridge.

  • हर्ष चौधरी

    I already own Microtek 625VA Pure Sine Wave inverter (With Luminious 150Ah Battery) – 04 years old. I recently bought a 2 BHK house and feel the need of beefier inverter.

    My existing peak load is 3x55W fans, 3x20W LED Tubelights, 1×40″ LED TV(Sony KDL-40W900A @130Watts but I run it on low power saving mode), 1xSTB(18 Watts), 1XKent RO System (Occasionally on inverter) but I don’t use them all but they have the inverter connection.

    My standard usage on inverter is generally 1×14 Watt CFL, 1x55W Fan, 1x130W LED TV, 1x18W STB, slew of other low wattage gadgets(occasionally), 1x600W Hand Blender (I don’t know how it runs but it runs- Usage is occasional)

    I want to add my refrigerator (253Ltr Samsung Digital Inverter Compressor – 2014 Model- RT27HAJYASA which is always set at 1 notch below optimal settings) which I don’t feel is feasible in the current setup. I want around 08 Hours on my standard load (I am rarely going to use my peak load) after including the Refrigerator. I feel a 2KVA System with two 150/160 Ah will be sufficient. Also, I may not be running the refrigerator on inverter all the time. I am provisioning it in case there is a grid failure, I may run the refrigerator for 4-5 hours, so the stuff inside the freezer (04 days of my backup milk supply) doesn’t melt.

    • https://www.bijlibachao.com Abhishek Jain

      Hi Harsh,

      Even for your existing peak load, a 625 VA inverter is more than enough. But then if you want to add refrigerator then you may need to go with a 1000 VA. But if you want 8 hours backup, then you may need more batteries. So you will have to go for a bigger system. You can go for 2 kVA but I think even 1400 VA/24 V system with two 150 Ah batteries would be good enough. Refrigerator would not have a lot of power consumption in 4-5 hours so two 150Ah should be fine.

      Also your hand blender would run slow if it does not get good enough voltage, but yes it would still run (just like a ceiling fan). But it would not need very high startup current.

      I think you should go for 1400VA/24V system with two 12V 150Ah batteries.

  • Wasi Ahmed

    I am planning to buy an inverter and I am looking for backup of
    3 fans
    3 tube lights
    2 LCD desktops
    1 router
    1 40″ LCD (optional)
    I am looking for back up for 4 to 5 hours. I am being offered zelio 1100 and RC 150ah, is it a good option. what options do I have. will it be sufficient for my requirement. please help me with this.

    • https://www.bijlibachao.com Abhishek Jain

      1100VA inverter would be sufficient but only one 150 Ah battery would just give you about 2 hours of backup. You will need two 150 Ah (total of 300 Ah) to get 4-5 hrs of backup. Also because you need two batteries, so two batteries will total up to 12V + 12V = 24V. So it will be better for you to go for a 24V inverter rather than a 12V inverter. The smallest 24V inverter you would get would be around 1400VA. So you need 1400VA/24V inverter with two 150 Ah batteries for 4-5 hrs backup.

  • Radhika Chiluka

    am planning to take a inverter .
    I need 1 fan
    3 tubelights
    mixi of 750wats capacity (optional)
    LCD tv including sundirect setup box

    suggest me which to take preferably with company name as i dont have any idea of this.
    and how much does it cost for inverter and battery

    • https://www.bijlibachao.com Abhishek Jain

      Hi Radhika,

      I would not suggest including mixi in the setup as it can significantly increase the size of inverter you would need. Otherwise for the rest of the things a 450 VA inverter would be more than enough. The size of battery will depend on the number of hours you want to use these appliances on inverter.

      Typically batteries are the most expensive part of any inverter. A battery would cost anywhere above Rs 8000 depending on the size that you need. Rs 8000 is for smallest 80Ah battery. You also need to replace batteries every 4-5 years.

      Inverters are cheaper. They cost about Rs 3000-4500.

  • Baleshwar Mishra

    I need a suggestion from you guys

    2 fans

    5 LED (7 watt per)

    1 LED TV 24″

    1 Laptop

    1 Desert cooler medium size

    Suggest me a good Inverter & Battery or combo

    • https://www.bijlibachao.com Abhishek Jain

      850 VA should be good enough for your load. How long (in hours) do you need the back up for?

  • D.P.Joshi

    Thanks for providing a very valuable information. Pls let me know Microtek inverter EB700 fitted with Exide Inva Plus 1500 Fully charged can run an air cooler Koolair 40(Havells) 150 watts (Hrs Reqd) also how much time it will take for the inverter battery for regaining full recharge(Charging duration required) Once again thanks.

    • https://www.bijlibachao.com Abhishek Jain

      700 VA inverter should be able to run your air cooler. So I do not think there is any problem with that. If you check the specs of the inverter, it says charging current is 10 Amp. So a 150Ah battery will get fully charged in 15 hours.

  • ലാലാല ജ്പത് റോയ്

    my required load can go upto 700W, So as per your tutorial, I think I require 1000VA inverter. I checked many models of sukam like falcon+, falcon++, brainy eco, falcon HBU. Can you suggest me a good inverter out of these. Is there any other inverter in the market with star rating

    • https://www.bijlibachao.com Abhishek Jain

      I think Falcon+ and Falcom++ are great models.

  • Vyasmaharaj

    Hi .
    I need inverter for two ceiling fans 2 8 watt cfl and 230 ltr inverter technology Refrigerator. Power cut is just 2 hours a day .Kindly guide me which inverter I should buy??. Thanks and Regards. Vyasmaharaj

    • https://www.bijlibachao.com Abhishek Jain

      Two Ceiling fans would be 180 watts, Two CFLs would be 16 watts, Refrigerator would be max 350 watts. Total would be around 550 watts. I think a 650 or 700 VA inverter would be good enough with a 120 Ah battery.

  • Anindya

    Hi Abhishek,

    At any given time, maximum I will need, 2 tubes, 2 fans, one mobile charging point, one microwave (limited use), one CFL. I need backup of at least 4 hrs and if more the better. What inverter and what battery shall I purchase?

    • Anindya

      If I leave microwave aside but need backup for longer time say 6-7h hrs,then?

      I want an inverter that can handle if I add another battery in future.


    • https://www.bijlibachao.com Abhishek Jain

      HI Anindya,

      If you leave out microwave a 450VA inverter would be more than enough for you. But if you add microwave then you will have to increase it to 1450 VA or more (depending on the size of the microwave). Any heating or cooling appliance has significantly high electricity consumption. A 150 Ah battery should be more than enough for your use.

  • Avinash Mahato

    Hi Abhishek,

    My requirement is

    2 Tubelight

    2 fan

    4 desktop with LCD screen

    3 Laptop

    1 AC(1 Ton)

    Backup time required: 4 hours approx..

    Please suggest me a good choice else pleases suggest me a good inverter and battery combination.



    • https://www.bijlibachao.com Abhishek Jain

      Hi Avinash,

      Inverter is not good for running AC. If you want to run AC then it is better to go for DG set.

  • Suresh RM

    Hi Abhishek,

    First of all thanks a lot for the simple and detailed explanation. My requirement is

    3 Tube lights – 40W (120W)
    3 fans – 90 W each (270W)
    1 led tv 32″-100W
    1 set top box-25W
    1 Mixer grinder / 1 wet grinder – 350 W
    1 Laptop with router
    1 Refrigerator 190 L wirpool brought 6 years back

    Backup time required: 6 hours approx.

    Kindly suggest the best possible options .

    Suresh RM

    • https://www.bijlibachao.com Abhishek Jain

      Is it really necessary to have Grinder and Refrigerator in the mix? It will significantly increase the size of inverter required.

    • Suresh RM

      No not necessary . I can exclude fride , AC and wet grinder. I may need mixer

      Suresh rm

    • https://www.bijlibachao.com Abhishek Jain

      Mixer Grinder is also a motor. I think if you want to use that then you will need a 2.5 kVA inverter. I would say go for a 2.5 kVA/24V inverter with two numbers of 150Ah batteries.

    • Suresh RM

      Thanks abhishek. Sorry for not putting my requirement clear. I will use. Mixer grinder only in need time and will switch off other fittings. In this case what is the capacity I should look for ? Also can u suggest some of the brands and models I should look for.

    • https://www.bijlibachao.com Abhishek Jain

      I would suggest going for a 1000VA Sukam Falcon+ for your usage. However if you need 6 hours backup, you would need about 3 units of electricity. Which means you would need two numbers of 150 Ah batteries. In that case, Sukam Falcon + 1400 VA with 24 V would be needed (24 V to support two 12V batteries). Faclon+ and Falcon++ can handle high inrush current, so you may run Grinder as well on it.

    • Suresh RM

      Thanks a lot for your suggestion.

  • Rut


    I have calculated my usage according to the given equations. It comes out as requirement of 350ah battery and 625KVA Inverter. This is for home purpose and we have to live for around 8hrs in a day and twice in a week so require battery with more capacity.

    What brands would you suggest for inverter and battery?

    Key concerns for the brand:
    1. Should provide good service.
    2. Longativity

    One more thing is I have space for inverter in the loft in dark passage. What should I keep in my in terms of inverter/battery heating when placed in such a place?


    • https://www.bijlibachao.com Abhishek Jain

      Go for 1400 VA / 24 Volt inverter. Each battery is 12V and for 350 Ah you would need two numbers of 180 Ah batteries to make 24V (12V + 12V). Also please note that the charging current for most inverters is about 13-15 Amp. So 180 Ah battery will get charged in 180/15 hrs.

      It is better to keep batteries in open space. Not just heat, they also release some fumes.

      You can look at models from Sukam, Luminous or Microtek.

    • Rut

      Which brand you prefer for inverter? Actually I have got ideas about battery and Exide battery seems to be good but in terms of Inverter it is really confusing.

    • https://www.bijlibachao.com Abhishek Jain

      Sukam, Luminous or Microtek are leaders for inverters.

  • Parminder singh

    I had purchased India battery around four years ago. It is of 12 volt with 150 ah. Earlier it was giving very less back up. Now it seems it is dead. Even after charging continuously it is not giving a single min back up. How can I ensure that it us really dead.

    • https://www.bijlibachao.com Abhishek Jain

      The performance of a battery can be measured using “Specific Gravity” test. If the specific gravity is about 1.26 then it is completely charged. If it goes below 1.18 and does not increase even after charging, then it is dead. Any technician who deals with inverter/battery in your area should be able to check it out using a hydrometer.

  • Gaurav Singla

    Hi Abhishek, I am planning to buy an inverter and here are my back up requirements:

    4 tube lights – 40W each
    3 ceiling fans – 100W each
    1 LED tv 43 inches – assuming 100W
    1 HD set top box – 20W
    I refrigerator of 350 L capacity – assuming 350W

    Based on the equations and formulae you have provided, it seems like I will need a battery set up of about 650 Ah. Is my calculation accurate?

    • https://www.bijlibachao.com Abhishek Jain

      Hi Gaurav,

      Here is the calculation:

      4 x 40 = 160
      3 x 100 = 300
      1 x 100 = 100
      1 x 20 = 20
      1 x 350 = 350

      160 + 300 + 100 +20 + 350 = 930 Watts.

      In terms of VA that comes to 930/0.8 = 1162 VA … let’s take roughly 1200 VA.

      But there is a catch …. You have a refrigerator. If it is a non-inverter technology compressor refrigerator, then it would need 3-4 times more starting current. Typically, in that case, a 2.5 kVA inverter would be recommended. However, these days there are many inverters available that can handle high starting current without going for a larger capacity (e.g. Sukam Falcon+). So you either go for a regular inverter of 2.5 kVA or a 1200 VA -1400 VA one that can handle high inrush current.

      Also the size of battery (in Ah) will depend on number of hours of backup (time for which you want to run the appliances on batteries) that you need. It won’t be 650Ah.

    • stalin

      hi Abhishek,

      I want to use the following appliances for a 4 hr backup:

      tubelight 3

      computer 3

      cfl 3

      tv 1

      battery size 180ah * 3 is available

      But as the inverter not available with these exact specifications, what is your reccomended combination of Inverter a apt for my use.

  • Rajat Gupta

    Hi Abhishek,Iam following Bijli Bachao for past 3 years and it helped me alot.I really appericiate the ratings and layman approach towards technical details.

    My requirement is

    3 Tube lights – 40W,28W,20W (88W)

    2 fans – 90 W each (180W)

    1 led tv 32″-100W

    1 set top box-25W

    1 Refrigerator 310 L(LG GL-T322GP) – 140 W(Defrost Capacity)

    Backup time required: 4 hours approx..Total load 533W

    Kindly suggest the best possible options

    • https://www.bijlibachao.com Abhishek Jain

      Hi Rajat,

      I don’t think your refrigerator is the new inverter technology compressor refrigerator. I guess it is an old one (with regular compressor). Regular compressors have a high initial current and in regular cases I would have suggested 2-2.5 kVA model (just to handle the high initial current). However these days many inverters claim to handle 2-3 times more initial current (some claim to even handle 6 times inrush current). I think something like Su-kam Falcom + 900VA or 1100 VA of 12V should be good with a 150 Ah battery.

    • stalin

      hi Abhishek,

      I want to use the following appliances for a 4 hr backup:

      tubelight 3
      computer 3
      cfl 3
      tv 1
      battery size 180ah * 3 is available

      1 LCD TV (42 inch) (150X1= 150)

      1 HD set top box (18X1=18)

      As per your instructions this comes to 803X 4 = 3212 watt hr or 3.2 kilo watt hr

      The VA of inverter 803/0.7=1147 VA

      The battery size 1147X4=4588 VAh

      4588/12= 382 Ah

      But as the inverter not available with these exact specifications, what is your reccomended combination of Inverter a apt for my use.



    • Rajat Gupta

      Thanks Abhishek for the prompt response and guidance.

    • Rajat Gupta

      One more thing, for refrigerator I have voltage stablizer will it affect the initial current.

    • https://www.bijlibachao.com Abhishek Jain

      No it will not. Even with Stabilizer, the initial current will be high.

  • D.P.Joshi

    Havells air cooler some cooler motor is aluminium winded while the other are copper, what is the difference copper v/s aluminium which one is more durable, also cooler motor fan some 3 or 4 or even five , so which one will make less noise(not exhaust fan) Kindly let me know.

    • https://www.bijlibachao.com Abhishek Jain

      Copper is a better conductor of electricity and thus, copper models are more energy efficient. Copper is also more durable. In general copper windings in a fan make them last longer. As for number of blades, a 3 blade fan is much more optimized and should make less noise.

  • Trideep

    Hi Abhishek,

    Am looking for a solution for a place where they have 8-10 hours of power cut on a daily basis. The basic requirement would be 1-2 fan, 2-3 cfl/led and 1 crt tv. What would be the ideal solution and any recommended brands? This will be in the North East, so we wont have a huge selection of brands.

    • https://www.bijlibachao.com Abhishek Jain

      Hi Trideep,

      Normally a 450 VA inverter would have been more than enough for your appliances, but a 450 VA inverter comes only in a 12V variant which can connect only 1 battery. For 8-10 hrs backup you would need two 150Ah or 180 Ah batteries. Each battery is 12V so two batteries make it 24V. The smallest 24V inverter you would get in market would be of 1400 VA. Which can actually support 3-4 times more appliances than you currently have. But if 8-10 hrs backup is a must then you will have to go for 1400VA inverter of 24V with two 150Ah or 180 Ah batteries (bigger the battery, more the backup). You can go for the likes of Sukam, Luminous or Microtek inverters (better go for same brand inverter/battery combo).


    hi, abhi sir i have sukam shinewave inverter 850va with sukam long tubular 150ah battery combo. but my inverter or battery regularly consumes about 200watts electricity wtihout power cuts (no power cuts for long time ).this consumption shown by electric meter whenever checked . but when i plug out inverter and battery from main line then meter shows zero consumption . why this occur ??????? due to this reason my electricity bill remian very high with last 2 year . pls tell me solution or reason ………. with regards

    • https://www.bijlibachao.com Abhishek Jain

      200 watts is quite high. That would be 2 units in 10 hours of usage or more than 4 units in a full day (that is much more than what a refrigerator consumes). Most likely the battery would have gone bad. But if there are no power cuts, why are you using it?


      thanks abhi sir, what are the symptoms of battery gone bad. my su kam battery is 4 years old, it also consumes very high quantity of water regularly. and their is very small power cuts 5 to 10 minutes in a day or 3 to 4 days not regularly . pls tell that on stand by mode a battery should consume how much electricity in watts??

    • https://www.bijlibachao.com Abhishek Jain

      Hello Mr Sharma,

      To check if an inverter battery has gone bad, engineers check the specific gravity of the acid inside it. Typically specific gravity of sulphuric acid (acid inside the battery) is 1.84. When it is diluted with water, it goes down to 1.2. A battery has gone bad if the specific gravity is much below that number. Any battery guy should be able to test that for you. They will use a hydrometer to test it. I cannot comment on how many watts it may use on stand by mode.

  • eswar_n

    is the godrej(875 VA DLX) inverter and exide(IT 500 150AH) battery comb is correct or not.we are getting so many problems with this comb.It doesn’t charge and it does n’t goes to mains mode etc.. If this comb is wrong then tell me the reason

  • JOJO

    dear Mr. abhishek
    Pls suggest me best inverter for 4 fans, 3 tube light, 4 cfl, 32 tv lcd

    • https://www.bijlibachao.com Abhishek Jain

      You should go for a 850 VA sine wave inverter. A 150 Ah battery can give you 3 hours backup.

  • D.P.Joshi

    Hi, I have microtek EB 700 inverter & exide unvatubular 150 Ah battery, Can I run a Havells air cooler copper winded with five fan leaf, as per their manual it is 150 Watts and can run on inverter, can it run in the inverter and battery mentioned above for short duration say for an hour or two. Pls clarify.Thanks D.P.Joshi Vill Bharatpur Distt Rampur U.P

    • https://www.bijlibachao.com Abhishek Jain

      Hello Mr Joshi,

      You can certainly run a 150 Watt cooler on a 700 VA inverter.

  • Gupta

    Hi Abhishek,

    I have few doubts and I am sure you will be able to help.

    I can see 2 type of batteries “tabular” and “Tall Tabular”. Please
    suggest the difference as Not found anything for this by google.

    have a 1000 va UPS. But UPS comes with 7ah battery. can I replace 7ah
    battery with 80/100ah battery to run LED TV+WIfi+setup for 2-3 hours.



    • https://www.bijlibachao.com Abhishek Jain


      Here is my response:

      1) As the name suggests the size of the battery is taller as compared to normal tubular battery which gives more life and low maintenance.

      2) It is strange that you have a 1kVA system with just 7 Ah battery. 7 Ah is too small and can just give few mins of backup for an appliance like Desktop. I would suggest not to disturb the back of the UPS and having another Inverter for the purpose for other loads. The cost of inverter is much less as compared to the cost of battery.

  • Shekhar Iyer

    Hi abhishek, My questions are as follows

    1. For the following requirements is there any inverter battery combo for less than 10k that I can order them from amazon and can supply power for 3-4 hours?

    1 tube light 50 watts
    2 Laptops 100 watts
    wifi = 10 watts

    Are these 2 products a good choice? 1. Exide 150AH New InstaBrite Inveter UPS Battery – 36 Month Warranty & APC Home UPS 850VA Sine Wave BI850SINE
    or should I opt for a tubular battery of exide as you had mentioned that tubular batteries are good in the long run but it has only one review from amazon ( Exide Inva Master Tubular Battery 150Ah/12V (White & Red))

    2. Is the installation easy or should I use a local electrician for installation.
    3. If the power keeps coming and going every 15 mins, does the inverter keep switching from inverter to power and vice-versa automatically? Does it keep charging automatically in case power comes?
    4. Lastly i think it helps to cut down our electricity bill as we are not charged while using inverter?

    • https://www.bijlibachao.com Abhishek Jain

      Hi Shekhar,

      Here is my response:

      1) Laptops are typically not more than 60 Watts. Your total load would be about 180-200 Watts. So even a 400 VA inverter would be more than enough (because your load is mostly resistive and the power factor would be close to 1). 850 VA would be a lot for that load. A 100 Ah battery would give you more than 5 hours backup. 80 Ah can give you 4 hours.

      Getting it for less than 10K would be difficult because the battery itself would not come for less than 7K. And the inverter would be additional 3-4K. The options you have chosen are too big for your needs.

      2) You should get it installed by a local electrician.

      3) If power keeps coming and going, then the inverter will keep switching automatically. It does charge automatically when power comes. So you do not have to do anything.

      4) If you buy an inverter with intelligent battery management feature, then it will switch off automatically when the battery is charged.

    • Shekhar Iyer


  • saroj

    hi can u suggest any ac for 150 sqft room.budget 40k

  • Picmeup

    Hi Abhishek, This is a wonderful article. Can you also shed some light on typical charges for installation of an inverter? In an existing 2 bedroom house, what should be the charges.

    • https://www.bijlibachao.com Abhishek Jain


      Do you want to know costs for buying an inverter/battery system or installation? Cost of buying will depend on the appliances that you have and hours of backup that you need. Cost of installation will depend on how much your local electrician charges. It varies from city to city as cost of human labor varies in cities.

    • Picmeup

      I was looking for ball park estimates for cost of installation

  • Ananth

    I need a suggestion from you guys

    2 fans 200watts
    3 tube lights 150 watts
    1 CFL 25 watts
    1 LED TV 100 watts
    Settop 25 watts
    Laptop 50 watts
    wifi 10 watts

    Suggest me a good Inverter & Battery or combo

    I need to purchase online as i dont have enough visibility at home towns. Request you to share the links to purchase online.
    I need 3-4 hrs backup continously. Please suggest me a combo (i feel combo is good, not sure). or suggest me a inverter and battery to purchase online.

    Just fit and forget type. no other maintainance with good warranty. (close to 36 months or 24 months)

  • Anup Raghunath


    My requirement is

    2 led lights
    2 fans
    1 led tv 32″
    1 settop box
    1 wifi

    Backup time required: 4 hours approx..

    I was planning for Sukam Falcon+ 1100 and Exide inva tubular 150. Please suggest me a if it’s a good choice else pleases suggest me a good inverter and battery combination.


    • https://www.bijlibachao.com Abhishek Jain

      Hi Anup,

      From whatever you have listed, the load would not even be 250 watts. For that kind of load even a 400-450 VA inverter would be more than enough. And I am sure not all of it would be used for full 4 hours. Even if you keep everything on, then with a 150 Ah battery, you can run everything for 6 hours. So your choice is much more than enough for your needs. You can go for a smaller size as well if you want. Or if you plan to add more appliances on inverter then you can go for this one as well.

  • saroj

    hi abhishek I am planning to buy a inverter for 4cfl 2tbl 1crt tv 4fan around 700w load for 8hrs
    .pls suggest which brand with model and supportive battery.

    • https://www.bijlibachao.com Abhishek Jain

      For 8 hours backup, you would need at least 2 batteries of 200 Ah. So I would say go for a 1400VA 24 Volt inverter with two numbers of 200 Ah batteries.


    Hi Abhishek,
    Its very informative chat that i have gone through, its an helping guide for first time user like me.
    Well i will also need your help since i am planning to buy an inverter for my 2 BHK flat,
    4 cfls, 2 tube lights,3 fans,1-32′ LCD TV,1 double door refrigerator,1 air cooler for approx 5 hrs.
    pls suggest which would be the best brand inverter with model no and supportive battery details,
    also it would be greatfull if you could give it with price estimation so as to make the quick decision.

    Thanks a lot in advance :-).

    Nitin Nilekar.

    • Imsoftware lab

      Hi abhishek, nice site and just the information i was looking for. So if I want to just powerup one laptop through a charger, one tube light and wifi for around 4 hours (during which time I think I should be able to charge my laptop so that I can use it once the inverter stops) in about 4 hours, then can i get an inverter and battery combo for under 10k for my requirements

    • https://www.bijlibachao.com Abhishek Jain


      Your total power requirement would not be more than 120 watts (and mostly electronics with high power factor) so a 150VA inverter will also be good enough for your needs. And for 4 hours you would not need more than 0.5 units of electricity, so even an 80Ah battery would be more than enough. But then batteries are costly. I guess you can get a 150 VA inverter for about 3K while 80 Ah battery may cost above 7K. It will cost slightly above 10K. I am not able to find anything specific online to make a recommendation. But many brands (Sukam, Luminous, etc) have 150VA inverter and Exide, etc have 80 Ah batteries.

    • https://www.bijlibachao.com Abhishek Jain

      I would suggest that you look at Sukam Falcon+ 1600 VA/24 V inverter (http://sukamfalcon.com/) and use it with two 200 Ah batteries.


      Thanks a Lot sir..

      It would be a great help if you can share the approx price of (Inverter +2 batteries)all inclusive.

      Awaiting your valuable response.

    • https://www.bijlibachao.com Abhishek Jain

      The inverter would cost you about Rs 7000 and the batteries would cost you about Rs 16-17K each. So total cost would come around Rs 39000. Batteries are most expensive element and they are needed because you have appliances like cooler for 5 hrs backup.

  • Prashant

    Hi ,
    I have earlier installed a 150 watt solar panel , a Luminous 850VA hybrid solar inverter and a Luminous solar battery model LPT 200L .
    But now my requirements have increased as i have installed a Samsung smart convertible refrigerator having inverter technology ( Model RT27JSMSASZ Top Mount Freezer with Digital Inverter 253 L) . i have average need of 1125 watts .

    so what should i do to fulfill my requirements.
    if i have to buy i would like Luminous products so please suggest!

    Thank You!
    Prashant Priyadarshi

    • https://www.bijlibachao.com Abhishek Jain

      Samsung Smart Convertible can easily run on 850 VA inverter, but it all depends on what all other things that you run on it. Average of 1125 watts will not run on 850VA inverter. You need a bigger inverter. Or separate out appliances on two different inverters.

  • pawanm

    we need a inverter with tabular battery for 04 desktop pc with LED monitor ,01 printer (EPSON L 220),04 led bulb(07 watt),02 silling fans,and 01 tube light.
    kindly suggest the which company and how much amount i have to pay???

    • https://www.bijlibachao.com Abhishek Jain

      Hi Pawan,

      For your setup, a 1400VA inverter would be good. The size and number of batteries will depend on the hours of backup that you need on inverter.

    • pawanm

      need 04-05 hours backup .

    • https://www.bijlibachao.com Abhishek Jain

      You should go for a 1400 VA 24V inverter with two 200 Ah batteries. That would give you 5 hours backup. Also you should go for a pure sine wave inverter as you have electronics to run on it. Sukam Falcon 1400VA/24V inverter should be good for you.

  • srikanth

    I live in Chennai where blackouts of 6 hours or more are now very common. Last year we had no power for 3 consecutive days following the deluge in December. As a result of this experience. I would like to have back up power, if feasible, for 2 full days to run a Samsung 331 litre fridge ( model Samsung RT33JSRZESP Frost-free) which, the manufacturer claims consumes only 261 units of power in a year.

    Besides the above, I would also like to power 2 ceiling fans for 24 hours a day for two days and 4 CFL lights for 12 hours a day for 2 days.

    Cost is not a consideration. However, I would like the inverter to have the flexibility to be charged by solar panels and a diesel generator.

    Will greatly appreciate your guidance. Thank you very much

    • https://www.bijlibachao.com Abhishek Jain

      Hello Mr Srikanth,

      I guess your refrigerator is the latest inverter technology refrigerator. It should not consume more than 1 unit a day.

      2 ceiling fans 90 watts each for 24 hours would consume: 2 x 90 x 24 /1000 = 4.32 units of electricity in a day

      4 CFLs of 23 watts each for 12 hours would consume: 4 x 23 x 12 /1000 = 1.1 units of electricity in a day.

      So total energy requirement for a day would be 1 + 4.32 + 1.1 = 6.42 units. So in 2 days it would be 12.84 units.

      The biggest battery commonly available in 200 Ah batter that can store 2 units of electricity. So to store 12.84 units you would need 6-7 batteries. Each battery is 12V, so to support 6-7 battery you need an inverter that can handle 12×6 = 72V inverter.

      Microtek has a 3 kVA 72 V inverter. Luminous has 5 kVA 72 V inverter. But your appliances won’t need 5 kVA so 3 kVA should be enough.

      Microtek’s 3kVA 72 V inverter would cost about Rs 30,000. Each battery would cost 17-18K each.

      If you want flexibility to be charged by grid or by solar then you will have to go for a solar conversion kit. Su-kam has a solar conversion kit to convert regular inverter to solar-grid hybrid. But I am not sure if it can handle a big system like this one. You will have to check with Su-kam on that.

      A solar 1 kWp system would generate 4 units of electricity per day. So if you want to charge the batteries in one day then you would need 3 kWp system. Else 1 kWp system can charge it in 3 days. A 1 kWp system would cost about Rs 75-90K.

    • sreenivasan srikanth

      Dear Mr. Jain,

      I greatly appreciate your clear response which puts the whole thing in perspective. I did not quite realise that I would need 6-7 batteries! I will analyse my requirements in light of what you have said and revert with further questions, if need be. Thank you so much for your reply. Regards,


  • Arihant

    Can I use a single 12V big battery like 200 Ah for a 24V Inverter?? Pls. suggest

    • https://www.bijlibachao.com Abhishek Jain

      You will need two of them 12V + 12V to make 24V.

  • Ananth Kumar

    I need a suggestion from you guys

    3 fans 300watts
    3 tube lights 150 watts
    1 CFL 25 watts
    1 LED TV 100 watts
    Settop 25 watts
    Laptop 50 watts
    wifi 10 watts

    Suggest me a good Inverter & Battery or combo

    I need to purchase online as i dont have enough visibility at home towns. Request you to share the links to purchase online.

  • vasudevan

    pl suggest inverter and battery capacity for 3 bed room house. I use 1pc (60w) + 2 fan (60 w each) 1 tv (100w) + 3 tube light (60 w each) for 6 hours back up. thanks vasudevan

    • https://www.bijlibachao.com Abhishek Jain

      Your total wattage would be about 565 watts (the numbers you have mentioned look slightly off). So a 750-800 VA inverter should be good for it. Assuming only 75% of the appliances are on at any given time, the 6 hour consumption would be about 2.5 units. If you go for 800 VA inverter then it would just be 12V inverter which can have only one battery. The biggest battery that you can get is 200 Ah which can store 2 units and would give you about 5 hrs backup. So if 5 hrs backup is fine, then 800 VA inverter with 200 Ah battery would be fine. If you want 6 hrs backup, then you will have to go for a 1400 VA inverter of 24V, which can support 2 numbers of 120Ah batteries. In that case you can get up to 6 hrs backup.

    • vasudevan

      Thanks for your detailed reply

  • ashok joshi

    my requirement-32’LCD 8led 15 watt,1fan only for 2-3 hours than which battery i should purchase flat plate or tubleor battery

    • https://www.bijlibachao.com Abhishek Jain

      Tubular batteries are better than Flat plate batteries.

  • shaikh

    Hi Abhishek;
    Need your help, I am looking for good Inverter/UPS and my requirement would be 1 ’32’ led, 2 Ceiling fans, 4 ‘7watts’ LED bulbs, 1 Laptop.
    where I am looking for backup 5-6 hrs. please guide me on this along with good brand too.

  • suresh

    Hi Abhishek,
    I have 3 CFL, 1 tube light, 42″ Plasma TV , 2 fan & Refrigerator please advise on the Inverter & the battery suitable.

    suresh V

    • https://www.bijlibachao.com Abhishek Jain

      Plasma TVs actually consume a lot of electricity. It would be about 300 watts. 3 CFLs would be about 60 watts. Tubelight 50 watts, 2 fans would be about 180 watts and refrigerator another 300 watts. So total would be about 900 watts. So a 1400-1500 VA inverter should be good enough. One with 24 V would be better. Two 200 Ah batteries should be able to give you 5-6 hrs backup.

    • suresh

      Thank you

  • Sagar

    Hi Abhishek,
    Appreciate the informative article. By the above formula I’ve freezed on buying a Pure Sign-wave 850/900 VA inverter with 150 Ah battery. Wanted specialist opinion from you on the below;

    1) Which brand of inverter can i buy keeping efficiency (power wastage) and durability factor in mind.

    2) Whether to buy Tubular battery or a Flat plate battery keeping charge drainage, warranty and maintenance in mind.

    3) How much additional costs will be incurred wrt. to the current electricity bill?

    Thanks much.

    • https://www.bijlibachao.com Abhishek Jain

      Hi Sagar,

      Here is my response:

      1) Brands like Sukam, Luminous, Microtek have been traditionally know for making good inverters. Okaya, Amaron, Exide have been known for batteries. These days inverter manufacturers have gotten into batteries and battery manufacturers have gotten into inverters. Also buying same brand inverter battery combo makes it better from service viewpoint.

      2) Tubular batteries are better than Flat plate batteries.

      3) Additional cost will depend on the amount of energy you store and the efficiency of the inverter. In general inverters have about 90% efficiency.

    • Sagar

      Thanks for the info Abhishek. !!

  • Prince

    Hi abhishek,

    Recently I purchased 900 VA luminous sinewave inverter with luminous tall tubular battery. My problem is when my fans are on inverter backup mode they are working slower compared to working on direct electricity. Even if just one fan is working its runs slower. As per dealer there is no issue with inverter and it’s normal.

    Can you please tell me is it normal ?

    • https://www.bijlibachao.com Abhishek Jain

      Fans run slower when the voltage is low. Somehow the inverter is not able to provide right voltage. It should not be like that. I do not think it is normal.

    • prince VARGHESE

      dear abhishek , for the above matter i called luminous installation person who checked that direct electricity coming thru gvt line is 235 volts & supply thru inverter is coming 206 volts on inverter mode , same thing he showed on the other new peice which he brought along with him. He said that in inverter mode voltage is fixed by company in between 206 to 210 volts by default & on double battery or higher models voltage will be recieved as we are getting from govt line . is it true ?? they made it check on other new pcs so i can’t complain that my inverter is not working fine ?? pls reply

    • https://www.bijlibachao.com Abhishek Jain

      Hi Prince,

      Battery voltage does play a role and you would certainly get better output with two 12 V batteries than one 12 V battery. But then the speed should not drop too much at 210V. I think the reason would be that you would have a square wave inverter rather than a pure sine wave inverter. Does your inverter make a humming sound when you put on a ceiling fan? If yes then you have a square wave or modified sine wave inverter. If no, then it would be a pure sine wave inverter. A pure sine wave inverter is expensive, but it has very less losses and thus it does not impact fan speed. A modified sine wave inverter will have losses which can result in reduced speed of ceiling fan. There is nothing much that can be done if you have a modified sine wave inverter. Adding two batteries is possible only if your inverter can handle it. And then again increasing the size does not make sense if you do not have that much load.

    • prince VARGHESE

      Thank you very much Abhishek for responding to my mails inspite of whole a lot of querries you have to answer on daily basis. regarding my querry its a pure sine wave Luminous Zelio 1100 Sine Wave Home Inverter with Luminous Electra LT 550N 160 AH Tall Tubular Battery. it is not modified sine wave or square wave. Backup is very good but only issue is the drop of voltage (206 volts compared to 230 volts which we are getting from govt electricty line) on inverter mode which reduces fan/cooler speed.

      My last question Is this problem with everybody or just me ??

    • https://www.bijlibachao.com Abhishek Jain

      Hi Prince,

      We have not heard about such complaint from anyone else.

  • Kumarvel

    Hi Abhishek,

    Im planning to buy a LUMINIOUS ZELIO
    1700 model with 2 x 220ah batteries since its a 24v inverter. I added up
    my total load as you have explained so very well in your above article.
    My load adds up to 925w in total. Can you tell me if the above model
    would suit my needs and @ full 925w load running how many hours back up i
    can get ?

    Also the rating for this system is 1500w max
    i think ? So does that mean when there is grid power also i can only
    have 1500w max thru the inverter running in my home ? What if i want to
    have about 2000w of load running thru the inverter WHEN there is power
    from the grid ? Will that be possible please ? Im asking because its a
    large home and we would (for flexibility sake) like to have all rooms
    supported by this UPS but we wont necessarily use more than 1500w in
    case of a power failure.

    If the above is a yes, then
    hypothetically when the power fails and at that moment if incidentally
    there is a 2000w load running, will the UPS identify it as an overload
    and buzz at it usually does for an overload so that we can manually
    switch off appliances and lower the load ?

    Thanks in advance

    • https://www.bijlibachao.com Abhishek Jain

      Hi Kumarvel,

      1500 VA inverter for 925 W load looks more than enough. The batteries you have selected should give you about 6 hrs of backup.

      Also when you cannot connect more than 1500 W to the inverter. Your electrician will make sure that only those appliances are connected to the inverter that the inverter can handle. So a separate connection will have to be made for some appliances through the inverter.

  • Pranjal Jain

    Very informative article. Helped me choose an inverter for my new apartment. Thanks. BTW, what do you have to say about the new type of inverters being advertised to support even Air Conditioners, are they just bait or do these perform well in the long run?

    • https://www.bijlibachao.com Abhishek Jain

      Hi Pranjal,

      The biggest challenge with Air Conditioners is that their initial startup current is very high. For normal operation they may need just 9-10 Amp current, but to startup that may shoot up to 20 Amp or more. I am increasingly seeing that manufacturers are making inverters that can handle 4-5 times more instantaneous current than the normal current they provide. So yes manufacturers are making such inverters.

      On top of that the new breed of ACs with inverter technology do not need high startup current. And thus a lower capacity inverter can easily handle such ACs. So yes they can perform.

  • Prasun Rai

    Hi Mr. Abhishek, my requirement is of running a 32″ LCD TV,1 Set Top Box, 3 LED Tubeligts-20 watt, 2 ceiling fan, 1 Cooler & 1 260 L Samsung Fridge for at max. 5-6 hrs. Kindly suggest an apt inverter for my use.

    • https://www.bijlibachao.com Abhishek Jain

      Hello Mr Rai,

      The total wattage of appliances would be about 1000-1200 watts. You have a fridge and cooler that would need high startup current, but then these days inverters claim to handle much more startup current than their rated VA value. So I think a 1600 VA 24 V inverter should be good.

      I think a Sukam Falcon+ 1600 VA/24V inverter with two 200Ah batteries should work for you. You can look at this: http://www.su-kam.com/power-solution/inverter-ups/falcon-plus

  • Akshant Gupta

    please suggest inverter size and number of batteries for 1 Ton inverter AC (Hitachi Kashikoi 5400) and 1 260L LG inverter fridge, and maybe 2 tube lights.

    • https://www.bijlibachao.com Abhishek Jain

      Hi Akshat,

      Hitachi Kashikoi 5400 1 ton AC has maximum power input of 1250 watts whereas nominal power input (at 1 ton) is 850 watts. Still let’s assume that some time it will run at peak capacity. So that is 1250 watts. LG Inverter fridge would also have max about 150 watts power input. And 2 tubelights would have about 100 watts. So all in all it would be about 1500 watts. Now power factors of these appliances would not be bad so ideally a 1600 VA inverter should have been fine. But just to be safe a 2 kVA inverter should be good for all of them.

      Now batteries will depend on hours of backup that you want. A 1 ton inverter AC would consume about 1.6-2 units in 4-5 hours. Fridge would hardly consume 0.2-0.3 units in that much time (not even that). Tubelights would consume another 0.5 units in 5 hrs.

      So if you go for a 2 kVA inverter which would be mostly 24V, then if you go for 2×150 Ah batteries that can store about 3 units of electricity. It can work well for 4-5 hours for your setup.

  • Gurpreet Singh

    Hi Abhishek,
    I want to run 3 fans, 3 led(120w), 1 tubelight, 1 router, 1 40″ vu led tv. Please suggest, should i go with flat plate or tubular battery inverter. I am looking for a long battery life. Which brand is the best in terms of warranty n service?
    Someone suggested me okaya tubular and inverter as its the no.1 brand in tubular as per his saying.

    Thanks in advance.

    • https://www.bijlibachao.com Abhishek Jain

      Here is my response:

      1) Tubular batteries are better.
      2) Go for same brand inverter-battery combo. You would get better warranty and service.
      3) Okaya is a good battery brand. Su-kam, Luminous, Microtek are top inverter brands.

    • Gurpreet Singh

      Thanks Abhishek..

      150 AH and 900 VA should be enough for my requirment?

      if you can help me in choosing the brand between Microtek, Sukam and okaya that will be great.

    • https://www.bijlibachao.com Abhishek Jain

      Your total wattage would be 3×90 (fans) + 3×120 (LED) + 50 (tubelight) + 80 (TV) + 5 (router) = 765 watts. Assuming all run at any given time and power factor of 0.8 the VA value would be 765/0.8 = about 950.

      But then I guess not everything would run at any given time so 900 VA should be good. Also let’s assume only 70% of the appliances are on at any given time, the total instantaneous wattage would be 765*0.7 = 535 watts. So a 150 Ah battery that can store about 1.5 units, would give a backup of about 3 hours.

      Brand wise all three are good, Sukam in general has better features.

  • Theerta Prasad

    Hi sir,
    Thanks lot for providing very informative insight on inverters.
    I request you to guide me to decide which type of inverter I should buy? My requirements are
    3 ceiling fans, 3 Tube lights, 1LCD TV 32 “, 1 air cooler, 1 desktop, 3 CFL required for 6 hrs

    • https://www.bijlibachao.com Abhishek Jain

      Your total VA value would be about 1100 VA (about 900-1000 Watts). I think a 1600 VA/24V inverter with two 200 Ah batteries should work well for you. However please note that 200 Ah battery will take about 200/15 = 13 hrs to charge the battery completely. You should also go for a pure sine wave inverter as you have LCD and Desktop to run on it. I think Sukam Falcon Plus 1600 VA/24V model should be good with two 200 Ah batteries.

    • Theerta Prasad CS

      Thanks a ton sir

  • Chaitanya

    Hello Sir,Need your suggestion here.Thinking to buy a new inverter with battery.My usage is 4 tube lights,4 Fans and one 32″LED tv with Router.Please suggest me right power for it for 8 hrs backup.Also suggest the best brand in it.

  • Vikram

    Hello Sir,
    Thanks for the wonderful insight on the Invertors. Its pretty helpful.

    TV – 100 W
    Router – 5 W
    DTS set top box – 25 W
    PS4 – 200 W
    External Storage – 5 W

    The total load that i want to run on backup: ~ 350 W / .8 = 438 VA

    Total number of hours for which backup is required: 1 Hour
    438/1 = 438 VAH
    A regular inverter battery available in market is of 12 V, so the Ah value of battery required would be:
    438/12 = 40 Ah

    I already have gen backups in my apartement. But it usually takes 10 mins for the maintainece to bring it up. So anywhere between 10 mins to 60 mins would be ideal. I dont want my ps4 or my router to reboot because of that power cut. So in this case do I need to go for online UPS? Does inverter or offiline ups would also be fine in this case? Can you recommend some product as well?

    • https://www.bijlibachao.com Abhishek Jain

      Hello Vikram,

      Your calculations are correct. Online UPS can be good, but it will be expensive. Also it will have more electricity losses. You should go for an Inverter/UPS that has fast switching and pure sine wave. If the inverter/ups switches in milliseconds, then there won’t be a reboot. Something like Su-kam sine wave falcon inverter/ups should be good.

    • Vikram

      Awesome. Thank you so much for you help :) Appreciate it

  • bina

    sir, my requirement is 2 CFL,2 FANS,1 LED TV FOR 6 hours back up, pls suggest a good inverter plus a battery.
    Preferable for village use.

    • https://www.bijlibachao.com Abhishek Jain

      A 450 VA inverter with 150 Ah battery should be good enough for you to run the appliances you have mentioned. Because you have a LED TV, a pure sine wave inverter would be better for you. Sukam, Luminous, Microtek are some good inverter brands.

  • Raja Sahoo


    I have purchased Luminous 2KVA Sine Cruze Pure sine Wave inverter.However iam confused regarding the batteries which need to be used.My doubt is Which will be the best – 2*150Ah exide batteries or 2*200AH exide batteries?Also what will be charging time for the same combination?

    • https://www.bijlibachao.com Abhishek Jain

      Depends on the charging current of the inverter. I could not find the exact details in the specs available online. Typically inverters have a charging current of about 12 Amp. In case of big ones, it goes up to 15Amp (max 20 Amp is what I have seen). If it is 15 Amp then a 150 Ah battery will get charged in 150/15 = 10 hrs. A 200 Ah battery will get charged in 200/15 hrs.

      However, the choice will also have to depend on the backup you need. 2*150 Ah batteries would store about 3 units of electricity while 2*200Ah would store 4 units. And so 2*200Ah would last longer.

    • Raja Sahoo

      Thank you for the reply.I have one final question in the same regard.If I use Luminous 2KVA sine wave inverter along with 2*200AH batteries what will be the additional power increase in my electric bill per month(Approx)?

    • https://www.bijlibachao.com Abhishek Jain

      Ideally a 2*200 Ah battery should store 4 units of electricity but Inverter are generally 90-95% efficient. So max 4.5 units is what I would guess for 1 charge. Rest all depends on how frequently your power goes. Inverter itself should have a better power management feature and should not consume a lot when batteries are charged.

  • nilesh

    Is it better to have battery/inverter combo from the same manufacturer from a service perspective? I was zeroing on sukam inverter + exide tubular battery until somebody told me that the better to go with the combo from same company. This has delayed my purchase. Any help is appreciated.

    • https://www.bijlibachao.com Abhishek Jain

      It is certainly better to go for a battery/inverter combo from the same manufacturer from service perspective. So you have heard the right thing.

  • Nitin

    I need a inverter for my home to run 3 ceiling fans ; Total CFL 100w & 32′ Led & set top box to run around 6-7 hrs.
    Please suggest a good long life inverter & battery.

    • Nitin

      I need a inverter for my home to run 3 ceiling fans ; Total CFL 100w & 32′ Led & set top box to run around 6-7 hrs.
      Please suggest a good long life inverter & battery. [ i also messaged 6 days back.]

    • https://www.bijlibachao.com Abhishek Jain

      3 ceiling fans would be about 270 watts, plus 100 watts of CFL and 50 watts of LED+Settop box would make it 420 watts. A 600 VA inverter with 150 Ah battery can give you about 4-5 hrs of backup. If you go for 200 Ah battery then it can give you about 6 hrs of backup, but then it will take a long time to charge (about 20 hrs). A 150 Ah battery can charge (full) in 14-15 hrs. You can go for a Sukam, Luminous or Microtek inverter. Going for same brand battery+inverter would be good. Also look for pure sine wave inverter (as you have electronics to support).

  • Sanjeev

    Hi Abhishek ,

    Very nice article neat and clean !!

    This is sad to to tell you that i am also one of the sufferer of regular Power Cut in Kolkata.

    So my question is to you that if I need 3 CFL each 20Watt one 42″Tv and 3 ceiling fans then what should be the exact power consumption and what would be the ideal inverter and battery for my home ?

    Awaiting for your suggestion.

    Thanks a ton.

    • https://www.bijlibachao.com Abhishek Jain

      total wattage = 3×20 + 100 (worst case) + 3×90 = 430 watts.

      A 600 VA inverter should be good enough to support this. Add 150 Ah battery and it should give power backup of 3 hours.

  • Ansh

    Sir I really appreciate your article, I didn’t knew anything about inverter and batteries, now I feel like i know lot..
    would really appreciate if you can tell how i can tell how i can get to know which battery to buy in combination of inverter. I am looking for 900VA inverter but don’t know which AH battery will fit into it.
    As I am looking to buy online.

    • https://www.bijlibachao.com Abhishek Jain

      Hi Ansh,

      Most brands recommend an ideal battery size for inverters. However, you need to know your daily consumption to determine battery size. If you need 1 unit or kWh backup then 100 Ah battery. 1.5 units then 150 Ah, 2 units then 200 Ah. Each battery would be 12 V. Typically inverter charging current would be 10-12 Amp. So a 200 Ah battery will charge in 200/12 = about 15-17 hrs. A typical 900 VA inverter could only support one 12 V battery. So suppose you need 4 units backup then you need two 200 Ah batteries and in that case you will have to go for 24 V support (so you would need a bigger inverter).

  • Bharat Kumar

    One dealer told me 12000 rs for luminous inverter 850 v and luminous battery 150 ah
    Is it reasonable rate or not
    my requirement is 3 fan and 3 cfl and one led tv

    • https://www.bijlibachao.com Abhishek Jain

      850 VA is a lot for your needs. As per the calculations even a 450 VA should work … but if you want to be extra safe, even 600 or 650 VA would work.