Electricity Saving Tips For Homes And Offices

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

By on April 26, 2017

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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I need inverter with battery. 3 ceiling fans - 8 hours, 1led TV -8hours, 4led bulb - 4 hours , 1 audio system - 2 hours . suggest me few inverter with battery.

Abhishek Jain (Mod)

Here is your calculation. I am not sure about power consumption of your audio system, so I have assumed 200 watts:

ApplianceCountWattageTotal WattageHoursTotal Wh
LED Bulbs414564224
Audio System12002002400
  Total606 3424

You need to store about 3.6 units of electricity. So you will need two 180 Ah batteries and because you need two batteries, you need a 24V system. You can look at these:

Sukam Falcon (+ or ++ series)
Luminous Zelio 1700 (Zelio is one of their most popular range)
Microtek UPS SEBZ 1500 VA

And two 180 Ah batteries along with this (same as the inverter brand or exide/amaron).


Hi Sir,

Following are my requirements for my gaming zone please suggest me the best option.

20 CPU
20 LC monitor
3 Fan
1 Printer Samsung All in one Lazer printer A4/Legal size.
1 Wifi router
2 Mobile charger
1 Lan Switch

I need backup of total 6 Hr daily (3 hour in morning and 3 hour in evening as per my area load-shading of electricity)
Also assist me if i need only 3 hours of backup?

Abhishek Jain (Mod)

Hi Anwar,

Here is your 6 hrs calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
Mobile Charger2510660
Lan Switch155630
  Total3482 20892

And here is your 3 hrs calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
Mobile Charger2510330
Lan Switch155315
  Total3482 10446

For 6 hours you need to store 20 units of electricity and for 3 hours you need to store 10 units of electricity.

Now a big battery of 200 Ah can store about 2 units of electricity. So you need a 5 battery system for 3 hrs and 10 battery system for 6 hours.

But 5 battery system will be smaller for your total VA requirement (of 3.5 kVA) so you will have to go for 5.5 kVA 6 battery system.

You can check Luminous Cruz inverters. They have 5.5 kVA 6 battery system and 7.5 kVA 10 battery system. Su-kam also has collosal series that are big.


Thank you so much Abhishek Jain,
Your solution are very helpful. I will Share this with my friends.
Thank you once again



I want to run 20 LCD computers for 6 hours backup daily, Please assist me the best option for running safely?
I am willing to installed 2 inverter, Please assist me the inverter VA and no. of battery with AH ?

Abhishek Jain (Mod)

Do you just want to run 20 computers or even lights and fans along with them?


Following are my requirment please suggest me...
2 fans-8 hrs.
2 tube lights-2 hrs.


Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total280 1640

You need a 180 Ah battery to save this much electricity. You should go for a rapid charge inverter. You can go for Luminous Rapid Charge 1650 VA inverter with a 180 Ah battery.


3 Fans - 6 hrs,Tubelights -4,1 wifi modem,mobile charger,laptop charger


Many thanks for your very clear explaination and answering all questions - This is extemely helpful.

What is the co-relation between UPS Kva vs battery capacity ? Is it the time taken to charge the battery ?

E.g. if my consumption comes up to 1657.6 Vah for 4 hours which would translate to 138.13 AH at 12v, what is the right UPS capacity I should go for ?


Abhishek Jain (Mod)

Hello Mr Shrikanth,

There is no direct co-relation between UPS KVA and battery capacity. It is just that UPS with lower KVA values have lesser charging current and those with higher kVAs have higer charging current values. So for e.g. a small 450 VA UPS may have charging current of 7 Amp, a 750-850 VA inverter may have 10-12 Amp, and a 1400 VA may have charging current of 15 Amp ....

And with 7 Amp if you charge 150 Ah battery it will take 150/7 = roughly 20-21 hrs .... then it does not make sense to have a 150 Ah battery with an inverter that has charging current of 7 Amp .... If you have inverter with 10 Amp charging current, then it will charge in 15 hrs (still better) and if you go for inverter with 15 Amp charging current, it will charge in 10 hrs (best) .... There are also rapid charge inverters that charge at 24 Amp or so. So battery selection depends a lot on charging current.

Second thing that is important is UPS Voltage. A 12 V inverter can have only 1 battery in series ... although it can have 2-3 batteries if all are connected in parallel, but then when batteries are connected in parallel, then charging current divides equally in all batteries, so 2 batteries will charge in double time and 3 batteries in triple time.

A 24 V inverter can have 2, 4 or 6 batteries. Again in parallel of 2. So charging time will double up in 4 batteries and triple in 6 batteries.

Also all batteries should be of Same AH and ideally of same age. Because output is determined by a battery that has lowest Ah. So if you mix 120 Ah and 150 Ah batteries then you will get only 120 Ah output even from 150 Ah battery.


I need inverter with battery.4 fans-4 hours,fridge-2hours,4tubelights-4 hours,1 led Tv-4 hours with hd setup box,kitchen exchaust fan-1 hour.kindly suggest me few inverter with battery of same brand

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total1065 2885

You need to store about 3 units of electricity. So you will have to go for two batteries of 150 Ah. So you will have to go for a 24 V inverter. You can look at these:

Sukam Falcon (+ or ++ series)
Luminous Zelio 1700 (Zelio is one of their most popular range)
Microtek UPS SEBZ 1500 VA

And two 150 Ah batteries along with this (same as the inverter brand or exide/amaron).


Dear Mr. Jain,

Thank you for the in-depth knowledge about inverters and batteries.
Need your suggestions on below queries:

1. Help me choose the best inverter and battery for 3 ceiling fans for 8 hours, 2 tube lights for 4 hours, 2 CFLs for an hour and one point for mobile charging?

2. Help me with the brand name and model no. / name to choose from. And approx. costing if you can

3. If for some reason the power cut is more than 8 hours then would keeping an extra battery helps or it does not work this way?

4. You mentioned about refilling RO water or distilled water frequently, how frequently is this to be done?

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total421 2621

Although VA requirement is less, but you would need at least two 120 Ah batteries to store the electricity or two 150 Ah to be safe. And in such a case you need a 24 V inverter. You can look at these:

Sukam Falcon (+ or ++ series)
Luminous Zelio 1700 (Zelio is one of their most popular range)
Microtek UPS SEBZ 1500 VA

And two 150 Ah batteries along with this (same as the inverter brand or exide/amaron).

Each battery would cost about Rs 15000 and inverter would cost about Rs 8000-10000.

If you need more backup, then you will have to add two more batteries because a 24V inverter can handle 2,4 or 6 batteries. But please note that your charging time will double up and also you will have to put same Ah battery (in general it is not good to mix old and new batteries, and different Ah batteries as output will be determined by lowest Ah).

Checking of water depends on how frequently you discharge the batteries. But you should make sure that you check it at least once a month.


Hello Sir,

I am going to buy Inverter with Battery plz suggest me which brand is best?
requirement for 4 CFL, 2 fans, 1 LED TV.

Thank you,

Abhishek Jain (Mod)

How many hours of backup do you need?


need back up to 12 hours.. please suggest me inverter brand name & battery name..

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total329 3948

You need to store upto 4 units (4000 Wh) of electricity for which you will need two 200 Ah batteries. And although your VA requirement is quite less, but to support two batteries, you need at least 1400 VA inverter. So you can look at these:

Sukam Falcon (+ or ++ series)
Luminous Zelio 1700 (Zelio is one of their most popular range)
Microtek UPS SEBZ 1500 VA

And two 200 Ah batteries along with this (same as the inverter brand or exide/amaron).


Thank you Abhishek for providing me such a helpful information... Your website is very nice i will suggest my friends.

Abhishek Jain (Mod)

Thanks Bhushan. I am glad that you found it useful.


Plz suggest me back up 8 to 12 hours


microtek jumbo 2000 ,24 volts sinewave inverter with 220 ah ,2 tall tubular batteries , and if backup increase is needed in future one more 220 ah tubular battery can be connected to this system ,using parallel batteries connection method .primarily 2 battery 220 combination will give at least 5 to 6 hrs back with full load ,cooler ,fridge led tv stb ,modem aio computer ,a laptop woth charger ,5 cfl 4 fan ,4 tubelight ,a mixey ..door bell mobile charging ,pedestal fan etc ..not all the appliance s will be switched on at a same time ..is it possible for a medium size ,geyser ,washing machine ,immersion rod or a water heater to work on a inverter of this size ?not every thing will be used on the same time ..whts ur opinion ?

Abhishek Jain (Mod)

Hello Dr Khan,

I would request you to structure the question properly as it is extremely hard and time consuming to understand unstructured questions. And it delays the response as I tend to look at unstructured questions at the end. Easy to reply questions are answered first.

Now to your question: If you have a 24V inverter then you cannot increase backup with just 1 battery. You will need two batteries. So you can either connect 2, 4, 6 or 8 batteries to a 24V inverter. You cannot put 3 or 5 batteries. Also please note, with every parallel connection, the charging time will be double.

I doubt a geyser or immersion rod will work with a 2000 VA inverter. But you should be able to use the Washing Machine. However, you cannot exceed total load of 2000 VA. If it does exceed then the inverter will trip. In case it exceeds, you will have to switch off some of the appliances.


thats obvious ,i have already written in my comments that not all appliances will be working at a same time .so will be the backup time with 2 ,220 ah batteries ,500 to 600 w load ,ideally i need at least 6 to 7 hrs backup ..

Abhishek Jain (Mod)

220 Ah battery can store about 2-2.2 units of electricity which is 2000-2200 Wh ..... 600 W for 7 hours would consume 600 x 7 = 4200 Wh. So two batteries should be able to support 600 Watts for 7 hours.


Hello Mr Abhishek

Thank you for the great info on this site . I have a Microtek 1100 ( SEBZ ) connected to a EXide IT 500 ( 150AH ) . CAn I connect another battery of 150AH to this inverter . I am looking at doubling the back up time . Total watts is around 525. Thanks

Abhishek Jain (Mod)

Hi Abhilash,

You can certainly add another 150 Ah battery in parallel, but please note that it will double up the charging time. If charging current is 10 Amp, currently with one battery it will take 150/10 = 15 hrs. But with two batteries it will take 150/5 = 30 hrs (because 10 Amp will be divided 5-5 between the two).


1 kW system for Solar....

inverter ? ..... best performance .
Battery ? (180ah or 200ah, C10 or C20)
Solar Penal? (250watt/24va or 150watt/12va)
Solar Penal Controller?
& more information



I required 300w/10hrs regular(20w LED bulb @[email protected]) for my home.....by solar system... plz suggestion

Abhishek Jain (Mod)

300 W for 10 hrs would be 300x10 = 3000 Wh or 3 units of electricity. You would need 1 kW system to generate 3-4 units of electricity per day.



My poultry farm house load is as per
4 nos fans,
10 nos 100 watt bulbs,

For Approx of 8 hr backup.... SOLAR UNIT
plz suggestion

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattgeHoursTotal Wh
  Total1360 10880

In this case you would need 10-11 units of electricity every day. And a solar panel of 1 kW can generate 3-4 units of electricity. So you would need about 3 kW solar panel system. It will cost about 3 lakhs.

However, if you change your old Fans to BLDC fans and bulbs to LED bulbs, then BLDC fan will consume 30 watts and LED Bulbs will consume 15 Watts. And your calculation becomes:

ApplianceCountWattageTotal WattgeHoursTotal Wh
  Total270 2160

Now replacing fans would cost about 4 x 3500 = 14000. Replacing LED bulbs will cost: 10 x 150 = 1500 and the solar panel needed would be 750 watts which would cost about 75000. So all in all in about 92000-93000 you can get a better solution as compared to putting a solar panel for your existing setup.


Instead of luminous 2250 square wave inverter ,if i go for luminous cruze 2000 24 volts inverter ,or 2500 va 36 volt inverter ?whtats the difference between luminous 2250 square wave and luminous cruze 2000 and 2500 ,other than number of batteries etc ..the cost will increase to abt 2000 to 3000 a per amazon ,and flipkart shopping sites .

Abhishek Jain (Mod)

More VA will support more appliances. Also pure sine wave is better (luminous cruz is pure sine wave) for appliances as I mentioned in my previous reply.


luminous 2250va ,24 volts (with 2 , 180 ah amaron or a 220 ah tubular ones in the market ,tall tubular battery )square wave inverter , is a good option? using a 40 inch led tv with stb ,4 cfl ,led 4 fans ,1 pedestal fan ,1 computer modem ,4 tubelights ,1 aio computer ,3 to 4 smartphone mobile charging ,mixey ,air cooler ,and a 275 ltr fridge .not all things will be used at a same time ,will it give a overnight back for fridge ,fan cfl led mobile charging etc ?it is a 2 battery system .can the batteries of same voltage be increased to improve back up ?

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
LED TV + STB180804320
Pedestal Fan160604240
AIO Computer160604240
Mobile Charging4520480
  Total2377 6258

Biggest things are mixie and cooler. If you use mixie, you will have to switch off a lot of things if you go for a 2250 VA inverter. Also 220 Ah battery can store about 2200 Wh of electricity and so 2 batteries can store about 4400 Wh. As per the calculation above the requirement would be about 6300 Wh for 4 hours backup. I have taken mixie for 1 hour in the calculation. You can adjust the calculation as per your usage and can recalculate the same. Also for fridge I have assumed daily (for 24 hours) about 2000-3000 Wh (or 2-3 units of electricity). You can adjust your calculation based on the hours of backup you need. Calculation is simple Wattage x count = total wattage and Total Wattage x hours = Total Wh.

Luminous Cruz is a Sine Wave inverter. In general Sine wave inverters are better for the appliances as they induce less harmonic distortion. Square wave models induce harmonic distortion, which is specially not good if you have electronic appliances like TV, etc. Also Ceiling Fans when operated on Square Wave inverter produce humming noise which is not there in Pure Sine Wave inverters.

You can add batteries but you have to make sure that the Total Voltage of batteries in a series is same as the voltage of the inverter. Also the Ah value of all batteries should be same and never mix old and new batteries.

Sachin Singh Tomar

Thanks for useful information. Please suggest me batteries which will be best....I should go for Okaya or any other??

Abhishek Jain (Mod)

I think Exide and Amaron are great brands in batteries.



I am planning to an inverter and battery for home use. My requirement is to run 6 LED tube-lights, 4 Ceiling Fans, 1 32inch LED TV, 1 WiFi Router, 1 Water Purifier, 3 LED bulbs for about 4-6 hours.

What inverter and battery combination do you recommend?

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
LED TLs6201206720
TV + STB160606360
LED Bulbs315456270
Water Purifier180806480
  Total670 4020

You will need two batteries of 150 Ah to store about 3 units of electricity. And so you would need a two battery system or 24V system. You can look at these:

Sukam Falcon (+ or ++ series)
Luminous Zelio 1700 (Zelio is one of their most popular range)
Microtek UPS SEBZ 1500 VA

And two 150 Ah batteries along with this (same as the inverter brand or exide/amaron).



I have brought 1.5Kva luminous solar inverter(24v) and 2- 12v 200 ah solar tall tubular battery.
I want to buy solar panel and make move most of the things in my home to use solar power from inverter.
Inverter is supported upto 1000watts solar panel.

I want to run following (* optional which can be removed from off grid list based on availablity)
Appliance Count Wattage Total Wattage Hours Total Wh
Fans 3 90 270 8 2160
Led TLs 4 6 0
Led bulbs 2 3 0
TV + STB 1 80 80 12 960
Mobile 4 5 20 2 40
Wifi* 1 5 5 5 25
Water Purifier 1 80 80 5 400
Samsung AC 3star interver * 1 3
Laptop* 1 60 60 8 480

Can you please how many watts solar panel is required. how to maximize utilization of this system. i am based out of Chennai. Round the year solar power can be used.
Suggest solar panels company also.

Thanks and Regards,
Ashok Kumar Ponnaiah

Abhishek Jain (Mod)

What is the tonnage of inverter AC that you have? Also do you have 4 LED TLs that are run for 6 hours and 2 LED bulbs to be run for 3 hours? Running time for AC is 3 hrs?

Please note, if you can connect only 1 kW (1000 W) of panels, then 1 kW panel can generate max 3-4 units per day (on an average throughout the year). AC itself will consume 1.5 units (or more) in 3 hours.


Hi Abhishek,
I am using 1.5 ton ac.
AC is optional, if i can use in my off-grid it should be fine, else not an issue.
how about other items, FAN(3fans 12 hrs), TV+STB(12), lights & water purifier(2-3hrs).

Thanks and Regards,
Ashok Kumar Ponnaiah

Abhishek Jain (Mod)

If you want to use the fans for 12 hours then fans themselves will consume more than 3 units and will take up all the power generated by 1 kWp solar panel. Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
LED TL420806480
LED Bulb215306180
Water Purifier180802160

With some basic things, the total power consumption is more than 5 units.


uminous 1650 va inverter square or sine wave , with a 220 ah single tubular battery can handle ,a 275 ltr fridge and 2 cfl one fan for at least 3 to 4 hrs ?this inverter can run on both single as well as double batteries of same ah .if there are 2 batteries of same 220 ah attached to this inverter ,can it handle ,1 275 ltr fridge ,1, 40 inch led tv with stb ,4 cfl , 1 tubelight .1 mixey .2 fans for at least 3 to 5 hrs ,on battery backup ?all appliances will not run at the same time obviously do u know any other inverter which has power more than this one ,and primarily it can be used with single 220 ah battery ? infuture batteries can be increased 2 ,or 3 as per the backup requirement ?

Abhishek Jain (Mod)

Hi Faisal,

A 24V inverter can only run on two batteries. It has to be a 12V inverter to run on one battery. Single 220 Ah battery is much more than enough for a 275 ltr fridge and 2 cfl one fan for at least 3 to 4 hrs. A 150 Ah battery would have been more than enough. Even for 1 275 ltr fridge ,1, 40 inch led tv with stb ,4 cfl , 1 tubelight .1 mixey .2 fans for at least 3 to 5 hrs you need two 150 Ah batteries. Two 220 Ah would be much more than enough.

Mostly inverters with more than 1400 VA are 24V inverters that run on 2 batteries. So for more power requirement you need more batteries.

A 24 V inverter can have 2, 4 or 6 batteries (in parallel branches of 2). But then charging time will be 2 times in case of 4 batteries and 3 times in case of 6 batteries.


pls read my earlier message carefully ,i am talking abt ,luminous 1650 va square wave inverterthat is some thing in between ,(its unique) ,12 volts and 24 volts as seen in the advertisements on different portals ,it can work with 12 volts single battery primarily and after words a extra battery can be added to it ,of 150 ah to 220 ah ..depending upon the back up needed .generally a 24 volts inverter or a 36 volt or a 48 volts cannot work with a single ,or double or triple batteries ,respective ,needed as per the inverter voltage ..

Abhishek Jain (Mod)

Which Inverter model are you looking at. Because I know only 3 models from Luminous (1650VA):

Luminous Eco Volt 1650 Home UPS which is a 24 V double battery inverter
Luminous Rapid 1650 Home UPS which is a 12 V single battery inverter
Luminous Eco Watt 1650 Home UPS which is again a 24V double battery inverter.


My matter of concern is that putting 2 batteries of 180 ah or above in the way u have just explained in ur latest revert will increase the backup time and number of appliances or not .Or this inverter rapid charge 1650 single battery will not work as efficiently as a 24 v double battery inverter ?

Abhishek Jain (Mod)

Hi Faisal,

If you look at Luminous Eco Watt 1650 VA/24 V inverter, it has a charging current of 17 Amp. So if you put two batteries of 220 Ah as well, both the batteries will get 17 Amp and both of them will get charged in 220/17 = 12.94 hrs.

But if you put two batteries in luminous rapid charge, each battery will get 28/2 = 14 Amp current. And so two 220 Ah batteries will get charged in 220/14 = 15.71 hrs.

If you take 180 Ah batteries then in Eco Watt, each battery will get charged in 180/17 = 10.59 hrs.

While in Rapid Charge 180 Ah batteries will get charged in 180/14 = 12.86 hrs.

However if you put only one 180 Ah battery with rapid charge, it will get charged in 180/28 = 6.43 hrs.

So certainly Rapid Charge will not work as efficiently (if you mean time taken to charge as efficiency).


It is luminous 1650 rapid single battery inverter ,i have brought online with luminous e shop ,they are showing it their ad that as per the needs in this inverter batteries can be increased .

Abhishek Jain (Mod)

OK I got the reason for confusion. Rapid Charge is an inverter with high charging current. It charges at 28 Amp. Usually typical inverters charge at about 15 Amp.

Batteries can be connected in series and in parallel. In case you connect them in series, you have to make sure that the total voltage of the batteries is same as the total supported by the inverter. So if inverter is 12V you can connected only one battery. If inverter is 24V, then you can connect two batteries.

When the batteries are connected in parallel, each branch should match the total voltage. You can connect as many batteries as you want (maintaining the branch voltage), but then the charging current divides equally for each branch.

So now this inverter that you have bought is 12V, so you can have only 1 battery per branch (if you connect in parallel), but then each brach will get 28/2 = 14 Amp charging current (in case of two braches). A 14 Amp charging current will charge a 150 Ah battery in 150/14 = about 10 hrs, which is reasonable. But if you put 3 batteries (each in parallel) then each battery will get 28/3 = about 9 Amp charging current, so a 150 Ah battery will charge in 150/9 = approx 16 hrs.

Had the inverter been one with 15 Amp charging current then if you put 2 batteries in parallel, then each battery will get 15/2 = 7.5 Amp. This will increase the charging time for the battery.

The only reason you can add 2 batteries with this inverter is because it has high charging current of 28 Amp. But you will find it extremely difficult to take it to 3 or 4 batteries as charging time will keep on increasing if you add more batteries. 2 batteries is still reasonable considering the fact that each battery will get 14 Amp charging current.


Thank you very much very useful information

Sandip Chakraborty

Hello Sir,
This is very Informative portal.. I think everyone follow this portal before purchase Inverter/Battery.
Sir, Can you please suggest me the best option for following requirement.
1. 3 ceiling Fans (Approx. 8 Hrs Backup)
2. 3 Tube Lights ( Approx. 4 Hrs Backup)
3. 2 CFL Bulb (Approx. 3 Hrs. Backup)
4. 1 TV (approx. 2 Hrs. Backup)
5. 2 Ports for Mobile and Laptop Charging.

Please suggest the right choice with Budget Products.Its Urgent.
Thanks and Regards
Sandip Chakraborty

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
TV + STB180802160
  Total611 3543

You will need two 180 Ah batteries to store about 3.5 units of electricity. So you will have to go for a 24V inverter. A 1400 VA inverter with two 180 Ah batteries would be good. You can look at these:

Sukam Falcon (+ or ++ series)
Luminous Zelio 1700 (Zelio is one of their most popular range)
Microtek UPS SEBZ 1500 VA

And two 180 Ah batteries along with this (same as the inverter brand or exide/amaron).


Hello Sir,
I am planning to buy Microtek UPS SEBz 1100 VA (1.1 KVA) Pure Sine Wave Inverter. If I need 2 hrs backup, I see I need 183.33 Ah battery [(1100*2)/12]. Can you please suggest a couple of good batteries (180 Ah?) with full/exact names for this requirement?


Abhishek Jain (Mod)

Hi Karthik,

The calculation of Ah will depend on the appliances you have, their wattage and the time for which you want to run them. The calculation that you have done will not hold true if you connect any and everything to the inverter. You can check Exide (Tubular or Inva Tubular ) batteries or Amaron batteries.


Also, please suggest if it is safe to order and get batteries online or is it hazardous? How much may be the average installation charges in a metro city [material + labour] ?

Thanks sir for all the good work you are doing..this is the only site which has given all info I was looking for.


Abhishek Jain (Mod)

You can certainly purchase battery online. I myself puchased one from battery bhai a few years back and it worked fine. I am not sure of installation charges. You will have to check with them on the same.


Hi Abhishek,

I have a newly constructed 4 BHK home. I am planning for power back up, however I am really confused between opting for Solar power which is costing me around 4.5L for 4KVa or should I go for a basic inverter.
There are four members in the family unless we have some guests and backup requirement is for 4-5 hours.
> LED lights - 8 - 5W
> LED lights - 3 - 22W
> LED tube lights - 4 10W
> LED TV - 50" - 2
> Electric hob and chimney - 1
> Fans - 4nos
> Refrigerator - 360L - 2
> Destop and Laptop - 2
> Security Systems including DVR
> Internet Wifi
> Mixer Grinder
> Water purifier
> Automatic Water Softner

Kindly advise what should I go for with the best ROI. Also, based on your suggestion please let me know if there is any specification and brand that I should go with. I am pretty confused.


Abhishek Jain (Mod)

Hi Saj,

Here is my calculation based on best of my knowledge of power consumption of various appliance that you have (the exact number will be there on the specs of your appliances):

ApplianceCountWattageTotal WattageHoursTotal Wh
LED Lights85405200
LED Lights322665330
LED Lights410405200
TB + STB11001005500
Electric Chimney11001005500
Security System11501505750
Mixer Grinder17507501750
Water Purifier180805400
Water Softner180805400
  Total2681 8405

Based on this, I do not think you need a 4 kWp Solar PV system. I think a 2 kWp system should be good enough for 4-5 hrs backup.

You would need a 4 kVA inverter, but then that does not mean that you need a 4 kWp Solar PV system. 2 kWp panels with 4 kVA inverter would be good enough and that should not cost 4 lakhs, but about 2 lakhs.

If you do not go for solar panels, then you need a 3.5/4 kVA inverter with four 150 ah batteries. This should cost you about 60-70K.

ROI for non solar system would be faster, but then in case of Solar, once the ROI is obtained, the cost of electricity is almost nill. You will need inverter + batteries in both solar and non solar systems. Just that in case of solar, the electricity will be generated by panels, whereas in case of non solar, electricity will be taken from grid.

Depends on how much you want to invest. But from a long term perspective Solar is certainly better.

You can check Luminous, Sukam or Microtek inverters. They also have solar PV off grid systems.


i want use total 3fans in three different room,1 tubelight and 3 cfl. which inverter and battery is better for me. and what should be approx. cost?

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total389 2334

I think a 700 VA inverter with 180 Ah battery would be good enough. You can look at these:

Microtek UPS SEBz 700VA Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/k9chxTuuuN )
Su-Kam Shark 700 Va Square Wave Inverter (Flipkart Link: http://fkrt.it/klbvXTuuuN )
Luminous ECO VOLT 700VA Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/xE44z!NNNN )

you can go with any of these with a 180 Ah (same brand as inverter or exide/amaron tubular battery). Inverter should cost you about Rs 3500-4000 and battery would cost about Rs 17000-18000.


for 6 hours



My poultry farm house load is as per
4 nos fans,
10 nos 100 watt bulbs,

For Approx of 8 hr backup....
plz suggestion

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total1360 10880

You need to store about 10.8 units of electricity. Which means you will need 6 numbers of 180 Ah batteries. And for that you need 12x6 = 72 V inverter. You can look at these:

Microtek Max+ Series Online UPS 2 KVA / 72V (1800 Watts)

or big ones like:

Luminous Cruz 5.2 kVA/72 V inverter
Sukam Colosal Sine Wave Inverter

This along with 6 numbers of 180 Ah batteries.


10 number of 100W bulb can be changed to LED bulb of 7W if it is for light only (not to heat the farm). This will cinsume 70Watt instead of 1000 Watt. 7Watt LED bulb gives the light slightly more than 100 W filament bulb.

Govt of India is distributing 9Watt Philips LED bulb in 50% subsidy. It will be available in your electricity office. Show your connection proof like bill etc and you can get upto 10 bulbs. After that, your lighting will be of 90 Watt. I am using these bulbs in my home for 6 months. If you do not get it at subsidy, the market price is Rs 150.00

If you put these bulbs, your power need will be
2880 for fans
800 for lights (100 Watt aprox for 10 bulbs total)

Total 3600 Wh

Moderator please chech this calculation and if LED bulb is fit for poultry then please suggest the suitable inverter and battery.

Abhishek Jain (Mod)

Hi Jiban,

Thanks for the reply. We will have to wait for Imran to confirm if 100 Watt bulb is needed for heating the farm or if it can be replaced. If the replacement is possible then the requirements will come down significantly for sure.

srinivas -kishore

Hi sir, i'm in need to taking inverter backup for my home plz suggest. Inverter capacity and battery power that is needed.
3 Fans, 3 tube lights, 1 led tv, 1 setupbox, 1 power socket for phone charing.
So, plz suggest.......

Abhishek Jain (Mod)

Hi Srinivas,

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
TV + STB180803240
  Total505 1515

I think a 700-750 VA inverter with a 120 Ah battery can give you 3-4 hrs backup. You can check these:

Microtek UPS SEBz 700VA Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/k9chxTuuuN )
Su-Kam Shark 700 Va Square Wave Inverter (Flipkart Link: http://fkrt.it/klbvXTuuuN )
Luminous ECO VOLT 700VA Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/xE44z!NNNN )

you can go with any of these with a 120 Ah (same brand as inverter or exide/amaron tubular battery).


I want an inverter of nearly 850-900va.

I will be using 3 tube lights, 4 fans and 1 tv for 1 hour. I am loving in Delhi.

Currently I was using 650va luminous inverter which died after serving nearly 14 yrs. I already have 1 battery named SF Sonic power box pbx1500 which is working perfectly.

Any make with less power consumption is needed, please suggest.

Abhishek Jain (Mod)

Hi Rohit,

You can look at these:

Microtek UPS SEBz 900 VA Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/zka5pTuuuN )
Su-Kam SHINY 900VA/12V Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/7cukn!NNNN )
EXIDE XTATIC850VA UPS Pure Sine Wave Inverter (Flipkar Link: http://fkrt.it/EroiJ!NNNN )



What is the difference between 3 inverters and what is MCB in inverters.

I already have MCB at home, do I need MCB in inverters?

Abhishek Jain (Mod)

Hi Rohit,

These are three top rated inverters based on user feedback. Now Su-kam model is a Square wave inverter, so it would be the least favoured one among the three because square wave inverters do not have good harmonics which creates noise. Between the other two, I think Luminous Eco Volt is better because along with everything that Microtek inverter has, this model also has water level indicator which is important to take care of the batteries.

You may have MCB at home but then Inverters also have overload and short circuit protection. And your Inverter will be used when power from mains is off.


Forgot to mention: we do not have long powercut here. 2 hours of backup is enough.


Dear Sir,
I have just ordered Sukam 2000 VA Falcon ECO 2000/24V Inverter online. It is described as pure sine wave ups/inverter . But here you said su-kam inverters are square wave. Please tell me this model is pure sine wave or not. If it is not sine wave, I will cancel it ASAP.
If it is pure sine wave then I need your suggestion to choose proper battery for this model. I will use 4 fans, 1 CRT TV (21 inch), 1 CRT desktop (17 inch) now. Also have a plan to add 1 freeze(inverter tech) and 1 AC (inverter tech) in future.

Abhishek Jain (Mod)

Not all Sukam inverters are square wave. The reply that I had written was for a specific inverter. In fact Sukam mostly has pure sine wave inverters. Sukam Falcon is pure sine wave.

A few questions for you: 1) What will be the tonnage of AC you plan to add? 2) You can also change to BLDC Fans, LED TV and Desktop and save a lot on electricity as well as reduce the size of inverter/battery that you need. Do you plan to do so? Because otherwise 2 kVA will not be good enough if you add AC and Fridge.


Thanks Sir,
I have ordered an energy saving BLDC Jupiter fan some day ago. In fact, I first heard about Jupiter fan from this website. It is still on the way. It is 25 Watt fan. After using, it it is satisfactory, I will replace all the 4 fans with this 25 watt model.

Now about AC: the room size is 12/14 ft, so I think 1.5T is required. But if 1T AC can do it, it is better. Please suggest.

What if I do not connect the freeze with backup? Is it OK to keep a freeze without power maximum of 2 hours per day? Can it keep the cooling for such time? Please suggest battery with and without freeze both case.

Planning to get LED monitor for desktop next year. But the TV can not be changed soon.

Abhishek Jain (Mod)

For right sizing calculation of the AC, I would suggest that you use the calculator on this page: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

As for fridge, it depends, many modern fridges have cooling retention technology (with cooling pads) that can keep the fridge without power for 8-9 hrs. But if your fridge does not have that, then you would need backup for it.

Also you should NOT keep AC on inverter. Your 2 kVA inverter will not be able to support it along with other appliances.

Also 24V inverter is not suitable for you. It will be a two battery inverter. I think a single battery inverter of about 1100 VA should be good enough for you along with 150 Ah or 180 Ah battery. Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
TV + STB11501502300
  Total1050 1450

You can go for Exide InvaTubular Battery of 150 Ah.


Is there any single 24V battery for inverter? I could not find any online. I have ordered the 24V 2000VA inverter as it was available at 50% discount. I thought some extra wattage will be useful. 2000VA can be 1200 Watt at 60% power factor.

I am thinking about adding some solar panels with this in next year.

Abhishek Jain (Mod)

There are no 24V batteries. Inverter batteries are only 12V batteries. You will have to go for two batteries for a 24V inverter.



muje poultry farm ke liye 1500volt./ 8hrs ki supply wala inventor bataie...

Abhishek Jain (Mod)

Hi Imran,

Battery ek paani ki tanki ki tarah hoti hai. Tanki paani rakhti hai aur battery bijli. Jabtak aapko yeah nahin pata hai ki kitne paani ki zaroorat hai tab tak aap tanki ki size nahin bata sakte. Isi tarah jab tak aapko yeah nahin pata ki kitni bijli ki zaroorat hai aap battery nahin bata sakte.

Aur tanki ka paani 4 ghante chalega ya 8 ghante woh isse pata chal sakta hai ki kis kis cheez mein kitna pani ka istemaal hai. Isi tarah battery 8 ghante chale gi ki nahin usi se pata chal sakta hai ki aap kya kya upkaran uspar kitni der chalane wale ho. Bina uske kuch nahin bata sakte.


Dear Abhishek,
Firstly I should mention that you have done a really commendable job of enlightening people like me. This was so much required. A big thank you from all of us!!
I have a small query which I would request your advice. I have an old (5+years) UPS which has 500VA capacity. I am planning to use this with a local make tubular battery of 210AH. My need is to run basic home light fittings like 3 LED lights, 2 FANS, 1LED TV + SET top box, 2 Power/charging points for roughly around 4+ hours. My question is will it be wise to use such an old UPS? Are current UPS any more advance? Is this configuration right?
Thanks in advance for your reply.

Abhishek Jain (Mod)

Hi Nirav,

A lot depends on the kind of technology your old inverter has. These days several advanced battery management technologies have come in newer inverters that help charge/discharge batteries better based on climate and voltage. Also newer inverters are equipped to handle high inrush currents, so that even an appliance with motor like refrigerator, washing machine, mixer grinder that have high startup current are handled easily. So sometime back people had to buy inverters with 3 times steady state VA value (to handle high inrush current), but with modern inverters that is not required. But then you do not have any motor so that should be fine. But yes, better battery management improves battery life and charge.

If you think from a technology perspective then buying a newer inverter/UPS would be better. But then you will also have to consider the economic costs as you will have to spend more to buy a new one.

By the way a 500 VA inverter may not have high enough charging current to charge a 210 Ah battery fast. Most such inverters would have charging current of 10 Amp or less. And even with 10 Amp, a 210 Ah battery will charge in 210/10 = 21 hrs. So if you have a 4 hours power cut every day, then you will not get a fully charged battery all the time.

Your wattage would be 3 x 18 (LED Lights) + 2 x 90 (Fans) + 80 (TV+STB) + 2 x 60 (Laptop Charging points) = 434 watts. So 210 Ah will give you about 5 hrs backup.


Can you suggest good inver1050 VA and 150ah battery.

Abhishek Jain (Mod)

You can look at these:

Microtek UPS SEBz 1100 VA (1.1 KVA) Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/JayrVTuuuN )
Su-Kam Falcon + 1100 Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/YTnpQ!NNNN )

and For best battery you may go for Exide InvaTubular battery.


Hello sir please suggest me a good inverter for 1 led to,1 pc,3fans & 4-6 led lights ? How much will be the back up time?

Abhishek Jain (Mod)

Backup time will depend on the battery size that you put. Just like a tank stores water, battery stores electricity. Just like I cannot tell you how long will the water last without knowing the size of the tank, I cannot tell you how long will be the backup time without knowing the size of battery you are considering.


Exide it 400 115 àh


Hi please suggest a good inverter that can be used for 3-4 hours for 2 CFL 1 TV 2 fan

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total306 1224

Go for a 750 VA inverter with 100 Ah or 120 Ah battery. That will be good for your use. You can check these:

Microtek UPS SEBz 700VA Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/k9chxTuuuN )
Su-Kam Shark 700 Va Square Wave Inverter (Flipkart Link: http://fkrt.it/klbvXTuuuN )
Luminous ECO VOLT 700VA Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/xE44z!NNNN )

you can go with any of these with a 100 Ah or 120 Ah (same brand as inverter or exide/amaron tubular battery).



Abhishek Jain (Mod)

What is the number of backup hours that you need?


Around 3-4 hrs

Abhishek Jain (Mod)

Here is your calculation. I have assumed that you will charge laptops on charging point. There are some overestimations:

ApplianceCountWattageTotal WattageHoursTotal Wh
Charging Point (Laptop)3601804720
  Total880 3520

I think a 1100 VA inverter with a 220 Ah battery should be good enough for you. You can look at:

Microtek UPS SEBz 1100 VA (1.1 KVA) Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/JayrVTuuuN )
Su-Kam Falcon + 1100 Pure Sine Wave Inverter (Flipkart Link: http://fkrt.it/YTnpQ!NNNN )

This with a 220 Ah Tall Tubular battery of the same brand or Exide/Amaron would be good.


could u plz explain the difference between tubular ,,short tubular and long/tall tubular batteries ??

what are merits and demerits which is the best among and all? which to buy n use??

thanking in advance

Abhishek Jain (Mod)

Short Tubular Batteries are usually lesser capacity batteries (low storage) whereas Tall Tubular batteries have bigger storage capacities. If you need say a 150 Ah battery then you will get options in both and in such case you can go for a short tubular battery if you want to save on space. But a 150 Ah tall tubular battery should last longer. However, if you want to go for less than 150 Ah then you will get options only in Short Tubular and if you want capacity more than 150 Ah then you will get it only in tall tubular.


Hi sir, aforesaid article was so useful.
I need ur assistance regarding setting up a inverter to my home with the following details.
Ceiling fan-2
Stand fan-1
CFL bulbs-3
Mobile charging-2 (Phone+lappy)

Abhishek Jain (Mod)

How many hours of backup do you need?


Hi Abhishek Sir,I forgot to mention backup hours of the appliances. And now here it is...Ceiling fans (2) for 6h. CFL bulbs (3) for 4h. Tubelights (2) for 4h. Mobilecharging 2h. Laptop charge for 3h. Aircooler for 4h.

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total814 3546

Because you need about 3.6 units backup, you will have to go for two 180 Ah batteries. And in that case you will have to go for a 24 V inverter, so at least a 1400 VA inverter. You can look at these:

Sukam Falcon (+ or ++ series)
Luminous Zelio 1700 (Zelio is one of their most popular range)
Microtek UPS SEBZ 1500 VA

And two 180 Ah batteries along with this (same as the inverter brand or exide/amaron).


Hi Abhishek,
Thanks for this wonderful article.

I am looking for following backup option. Can you please suggest the Inverter & Battery best matching this requirement?

Fridge 1 x 4Hrs
Mixer Grinder 1 x 2hrs
Washing Machine 1 x 1hr
Aqua Guard 1 x 2hrs
TV 1 x 2hrs
Fan 3 x 4hrs
TL 4 x 4hrs
CFL 4 x 4hrs
Mobile 2 x 1hr
Laptop 2 x 2hrs

Thank You

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
Washing Machine14004001400
Aqua Guard160602120
  Total2332 5178

You need to store about 5.2 units of electricity for which you need 3 numbers of 180 Ah batteries. Which means you need to go for a 12x3 = 36 V system. But then you VA requirement is about 3.5 kVA and usually 3.5 kVA inverters are 48V inverters or 4 battery inverters. So you will have to go for a 4 battery system and in that case you can go for four numbers of 150 Ah batteries with a 3.5 KVA inverter.

You can check:

Fusion Series Pure Sine Wave Commercial UPS 3.5 kVA/48V
or Luminous Cruz 3.5 kVA/48V inverter.


Hi Abhishek,
Thanks for your response.
I realise this is going to be a costly option. Inverter cost itself in 15k range and 4 batteries on top of that.

So if i need to limit to 2 battery backup inverter, will you be able to help me on what all of these will need to be dropped off?
Some of these will be in alternate like TL & CFL.
Mixer & Washing Machine.
Also if I have to operate these high volt appliance, I can always switch off the lights, fans etc.

Abhishek Jain (Mod)

Hi Abhijeet,

The biggest 2 battery (24 V) inverter would be a 2 kVW inverter. You would need to reduce the total connected wattage to about 1500 watts for the same. If you remove mixer grinder and washing machine then it can come down to 1500 watts (or less). If you remove mixer grider and washing machine then total Wh required will also reduce by 2000 Wh or 2 units and will come down to about 3000 Wh or 3 units. And in that case you can go for two 150 Ah or 180 Ah batteries.

You can certainly run these high wattage appliance if you switch off lights and fans, but then if you run both of these together then you will have to practically switch off every thing as you will have to limit the wattage to about 1500-1600 watts and fridge will be the only thing that can continue running.

Also please note that batteries are like storage tanks. If you switch on a high wattage appliance, the stored electricity will also reduce quickly.


Hi Abhishek,
Thanks. Can you please suggest the Inverter and Battery models for this?

I read on some other sites that even though most of the manufacturers are now manufacturing or supplying both Inverter and Batteries, its better to purchase Inverter and Battery (Exide or Amaron) of different makes from better quality perspective.
I did read on other responses from you in this post that by purchasing Inverter and Battery of same supplier, it serves better from maintenance perspective.

Abhishek Jain (Mod)

Hi Abhijeet,

If you want the best inverter and best battery then you will have to go for different brands. But as I have mentioned, you get better service if you go for a single brand inverter/battery. The technician will come and make sure that the fluid levels in the battery are maintained (which is very important for long battery life). This will usually happen if you go for single brand combo. I would suggest that you go for Luminous Cruz 2 kVA/24 V inverter with two 150 or 180 Ah Luminous Tall Tubular battery. I usually recommend same brand because most people do not take good care of the batteries which results in less battery life. With a person coming and doing maintenance, it works out better. But if you think you can make sure that you check battery fluid levels regularly then you can go for an Exide or Amaron Battery.


Thank you very much Abhishek! Appreciate you taking out time and explaining the things in detail.


hi abhishek, great article ...learned alot from it

A little help plz...

can i put 12v battery of 200ah with an 24v 1400va inverter??

Abhishek Jain (Mod)

If you have a 24V inverter then you will have to put two batteries of 12V (12V + 12V = 24V) .... you cannot put a single 12V battery .... for e.g. if you get a gadget that need 2 AA batteries, can you run it on a singe AA battery? No you cannot. Similarly a 24V inverter needs 2 batteries.

If you need less storage then you can put two 12V 100 Ah batteries to make 200 Ah.


Hi Abhishek ,

I am planning to to buy inverter Please suggest the brand as well as the power configuration for both the inverter and battery. Also kindly suggest the type of inverter and battery. I have
1 kitchen chimney
1 aqua gard
1 symphony air cooler
1 43' inch led tv
5 fan
10 (7 w ) led bulbs
3 mobile charges
Minimum 8 to 10 hours of backup needed
Thank you

Abhishek Jain (Mod)

Hi Ashish,

10 hours is a really long backup and the system that can charge batteries in less than 14 hrs (because there are only 24 hours in a day) would have to be really huge. I think it will be better if you can go for a Diesel Generator set for the setup. 10 hours on an inverter would be highly highly ambitious.


Which solar inverter is best. Is excide solar inverter is good with excide battery?

Thanks and Regards,
Ashok kumar ponnaiah

Abhishek Jain (Mod)

Exide is a good brand. You can certainly go for it. Usually Sukam, Luminous and Microtek are leaders in inverters.


Hi Abhishek,

Thanks for producing a big resource on the inverter and home UPS. I've been using APC 850VA Home UPS and 12V 150AH Tubular Battery of Amara Raja Xenon from 2011. May be from the last month, I'm hearing beep sound during nights. I suppose it's a sign of dead battery. Please suggest me a good battery for my need.

I require backup for 1 PC (LED monitor, CPU, WiFi Router), 1LED TV with set top box, 5 Tubelights, 5 Fans, 2 CFL bulbs. Though all of them will not be used simultaneously, they are wired wrt inverter. Probably, only 1 PC, 2 fans and 2 lights require backup in the day time. I am looking for a power backup for 5-6 hours during day time.

However, If it is night, the power backup is needed for just 3 fans that should give me 8 hours backup. Been facing sleepless nights so I made that point.

Please suggest me which brand and capacity of the battery to opt.


Abhishek Jain (Mod)

Hi Sree,

1 PC + 2 Fans + 2 lights will be equal to 150 + 2 x 90 + 2 x 50 = 430 watts. And for 6 hours it would consume 430x6 = 2580 Wh. Usually a 200 Ah battery can store 2 units or a 220 Ah battery can store 2.2 units of electricity. But then that will not give 6 hours backup. Also an 850 VA inverter may not be good enough to charge a 200 Ah battery. You would need a 1100 VA for that.

3 Fans would be 3 x 90 = 270 Watts, and For 8 hours you would need 270 x 8 = 2160 Wh ..... So at the least you need a 200 Ah battery and 850 VA will be really slow in charging a 200 Ah battery. A 1100 VA inverter would be better.

Amaron and Exide are good battery brands. You can go for Exide Inva Tubular battery (200 Ah or 230 Ah).


Thank you, Abhishek for the recommendation. I came to know that one can use this setup with solar panels too. How can I make it? Any info on it.

Abhishek Jain (Mod)

Hi Sree,

Any regular inverter can be converted to solar using a Solar Conversion Kit. Brands like Sukam and Luminous have solar conversion kits that can be used to convert a regular inverter to solar (to work along with solar panels). You can check more on this link:


It is also available on amazon: http://amzn.to/2uA34Xy

Ashish Kumar Sharma

Dear Abhishek,
I am planning to buy a inverter and battery for following load :
4 fans (8 hr.)
3 CFL (4 hr.)
1 tube light (4 hr.)
1 TV (4 hr.)
2 mobile chargers (3 hr.)
1 RO water system (1 hr.)
Please suggest me a suitable product.

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
  Total649 3786

You need almost 4 units of electricity, so you need two battery (24V) system with two batteries of 200 Ah. So it will be better if you go for a 1600-1700 VA system with two 200 Ah batteries. You can look at these:

Luminous Zelio 1700,
Sukam Faclon+ (or ++) 1600 VA/24V models
Microtek SEBZ 1600 VA.

This along with two 200 Ah batteries (same brand or Exide/Amaron), would be good for you.


Hi, Nice article.
I want to go off grid for selected equipo enga. Running using solar. Can you please suggest.
I want to use 4 fan , led tv, 4led bulb & 2 tubelights. 2 mobile.

How many solar panel would be featured and ingeeyee system configuration.

Thanks and Regards,

Abhishek Jain (Mod)

Hello Mr Ashok,

It will be good if you can put this question related to solar on this page on this website: https://www.bijlibachao.com/solar/solar-panel-cell-cost-price-list-in-india.html

There are many vendors of solar that follow that page, and they will be able to provide you better data.


very nice advice.


very nice,helpful and technically justified topic


Hi Abhishek...
Planning to buy an inverter for back up of 6 to 8 hours. Please suggest the brand as well as the power configuration for both the inverter and battery. Also kindly suggest the type of inverter and battery.
7 Fans
7 led tubelight
10 cfl bulb
1 led TV 32inch
1 Refrigerator Double door
1 aquagard
1 kitchen chimney
1 mixer grider
1 symphony air cooler
1 washing machine (700w)

Abhishek Jain (Mod)

Hello Mr Rajesh,

I guess I did reply to you with the calculations yesterday. I think the requirement is too high and it will be better if you go for a Diesel Generator set to support so many appliances for such a long time.


Dear abhi..
I've 2 doubts..

1) i want to buy microtek sebz 1100va/luminous 1100va inverter with anton/microtek(mtek) 200VH tall tubular battery..Please chose which combination is good for me.. I'm not able to get 200VH tall tubular amron battery in online..Please chose the combination of right inverter with suitable battery..

2) i usually follow your information.. Sometimes you are mentioning microtek sebz 1100va and sometimes luminous 1100va and sometimes sukam 1100va with exide/amron battery like..If we take same company combination of inverter and battery then it's good like you wrote
here.. which I've to follow? I went through your link for inverter but microtek showing little rating and luminous showing high rating in flipkart..Its different in snapdeal too...

Please tell which inverter and battery I've to take..Previously i got 1100VA inverter and 200VH battery suitable for me like so please tell the best option for inverter and battery to buy for my home..I'm not able to get 200VH battery in online also..

I'll buy whenever I'll get a reply from you..

Hope I'll get detailed information for those questions and doubts..

With regards..


Abhishek Jain (Mod)

Hi Vijju,

Here is my response:

1) You can go for microtek sebz 1100va + microtek(mtek) 200VH tall tubular battery ... as single brand battery inverter combo gets you better warranty and service.

2) I have recommended all 3 brands as all of them are leaders in the market (based on volumes sold). I cannot say one as number one two or three because the recommendation is very subjective (opinion based) and I cannot give parameters to rate one of the as number one. If you go by popular response then on most ecommerce platforms you will find Luminous to be number one. However, that does not mean Su-kam and Microtek are bad. In fact having interacted with people at Su-kam and having seen their technology I think they have great technology. But then lot of market perception builds on price and marketing. If you expect me to pick one, then I will not be able to do that based on fixed parameters.


I can understand jee.. thank you..



Very Nice Article :)

Need you advise!

I am planning to buy Microtek HB 950 VA battery with Microtek Okaya 150 Ah Tubular battery. Can you please suggest if this is a good combination or do i have to re-consider other brands?

Abhishek Jain (Mod)

Hi Karan,

Microtek is a great brand. One of the leaders in inverters. You can certainly go for the combination.


Hi , abhishek
I am planning to to buy inverter Please suggest the brand as well as the power configuration for both the inverter and battery. Also kindly suggest the type of inverter and battery. I have
1duble door refrigerator
1mixer gringder
1 washing machine- 700w
1 kitchen chimney
1 aqua gard
1 symphony air cooler
1 32' inch led tv
7 fan
7 led tubelight
10 CFL bulb
1 laptop charging point
Minimum 6 to 8 hours of backup needed

Thank you

Abhishek Jain (Mod)

Here is your calculation:

ApplianceCountWattageTotal WattageHoursTotal Wh
Mixer Grinder17507501750
Washing Machine170070021400
Aqua Guard170702140
LED Tl7221546924
  Total3774 15534

I think for that much energy needs it is better that you go for a DG set. Inverter will be too big (with too many batteries) and not very economical.


hey Abhishek ,
I have a microtek UPS SEBz 1100 VA Pure sine wave inverter and and a 150 mah battery of the same brand .
How much battery back up will i get if 2 lights, 3 fans, 1 tv+stb and 1 CFL are in use ?

Abhishek Jain (Mod)

Assuming from lights you mean tubelights and they are old T8 tubelights, the total power consumption would be 2x50 + 3x90 + 80 + 23 = 473 watts. Now if all of them are in use at any given time then a 150 Ah which stores roughly 1.5 units of electricity will give 3 hours of backup (= 1.5 x 1000 / 473) ... so you will get roughly 3 hours backup.

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