Electricity Saving Tips For Homes And Offices

Refrigerators with Inverter technology can help save electricity

By on May 6, 2014

Refrigerator Inverter Are you planning to buy a refrigerator and looking for energy saving options? If upfront cost for buying is not a concern for you then do look at refrigerators with inverter technology. Rest assured that the extra money you pay upfront will be recovered in the form of electricity savings. Inverter technology that was developed in Japan is the most efficient refrigeration technology available in the market today that can save up to 30-50% electricity consumed (units consumed) compared to regular refrigerators available.

How does a refrigerator work?

Whenever it is hot and we want to feel cooler, if we take a bath, we suddenly start feeling better. The moisture (or water) on our body evaporates by taking heat from our body and makes us feel cooler. Similarly in a refrigerator there is a refrigerant called HFC (Hydro Floro Carbon) that moves in the pipes or coils on the rear part of the refrigerator. When it is in a liquid form, it takes the heat from the refrigerator contents and evaporates to form gas there by cooling the things kept in the refrigerator. The gas is then compressed using a compressor to convert it into liquid again, and the cycle continues. The compressor uses electricity to do its job and is the most electricity consuming part of a refrigerator.

Refrigerator also has a device called “Thermocouple” which senses the temperature inside the refrigerator and makes the compressor go “on” or “off”. The thermocouple works as per the temperature set in the refrigerator (yes you can set temperature in a refrigerator as well and we will explain it more in our other articles on refrigerators).

How does a compressor in regular refrigerator work?

Most compressors in regular refrigerators are single speed refrigerators. They are either “on” or “off” based on the temperature in the refrigerator and the setting in the thermocouple. Most compressors are designed to handle peak load conditions (for high temperatures in summers), which means that they run at peak load even in winters when the cooling requirement is less. Every time the refrigerator door is opened, heat enters the refrigerator and the compressor has to take care of this load as well. So most regular compressors are built to take care of peak load plus the “door open shut” load which during most of the year is much more than the actual requirement.

How does a compressor with inverter technology work?

A compressor with inverter technology works very much like a car accelerator. When the speed required is more, the acceleration is more, and when it is less, and then the acceleration is less. This makes sure that during summer months when cooling load is more, the compressor works at peak capacity taking more electricity. But during winter months when cooling load is less, the compressor works less there by consuming less electricity. Even in summer month, the night temperature is less than the day temperature and thus electricity savings happen in night when compressor can run at a lesser speed.

This kind of compressor never switches off even when the temperature stabilizes, but runs at a slower speed maintaining the temperature inside the refrigerator. The benefits are:

  • In an “on” “off” cycle of a regular refrigerator, inside temperature varies throughout. But in case of inverter technology, temperature is more stable.
  • The amount of noise made by the refrigerator is much less in refrigerators with inverter technology as compared to the regular ones.
  • Energy or electricity consumption is much less when the temperature stabilizes.

InverterTechnology

Although prices of inverter technology refrigerators are on a higher side, but they can save a good amount of electricity, there by helping you recover the money in your electricity bills.Infographic18

Source of Information:

http://www.panasonic.com/industrial/includes/pdf/invertercompressors-improvingefficiency.pdf

http://www.energyquest.ca.gov/how_it_works/refrigerator.html

Have question, doubt or comment? Leave a message (please submit once as the comments take time to appear online)

There Are 63 Comments

  1. Nitin says:

    Hello Pankaj,
    Which would be the most energy efficient side by side refrigerator with storage capacity of 550~600 ltrs, that runs on inverter technology and available in the Indian market presently. If you also gave me the price, it would be of great help. Thanks.

    • Abhishek Jain says:

      Hi Nitin,

      We do not have data on power consumption of side by side refrigerator as it is not made available in public domain by most manufacturers. However you can look at Hitachi, Panasonic, LG and Samsung brands.

  2. Dipak says:

    I am planning to buy Refrigerator for home.

    Which one is better?

    LG GL-E302RPTL or Whirlpool Neo IC 305 ?

    • Abhishek Jain says:

      LG GL-E302RPTL is BEE 4 star rated refrigerator with inverter technology compressor. Whirlpool NEO IC 305 Royal is BEE 4 star but Deluxe is BEE 3 star but both do not have inverter technology. Inverter Technology is better in general.

  3. SyedAleem says:

    Hi,

    I wanted to know what’s the difference between Smart Invertor technology (the 1 we have in LG) and the Digital Inverter technology (the 1 we have in Samsung) ?? Which is better interns of performance and durability. I likes LG product due to its build quality compared to Samsung. Please suggest on this ???

    • Abhishek Jain says:

      Smart Inverter and Digital Inverter are the same. The only type that is different is Linear Inverter which is there in LG. Inverter Technology is a SMART technology because it auto adjusts the compressor speed based on the load. It uses digital components to do the same. However Linear Inverter is a technology where motion of the compressor is linear which minimizes the energy loss in motion of the compressor. Along with that it auto adjusts its speed based on the load.

  4. Pankaj says:

    Hi Abhishek

    I want to buy a fridge around 550-600 litre which has good build quality and also easy to maintain via good after sales services. I was thinking b/w Hitachi . Sharp & Samsung. I heard Hitachi after sales is pathetic and not getting complete info on Sharp’s After sales service. SO its making me reort to Samsung side by side model rs21hstpn1. Can you comment on whether it is a good choice or not and if not would like to know your recommendations.

    Thanks

    • Abhishek Jain says:

      Hello Pankaj,

      If you are looking for star rated double door refrigerators then you can look at these:

      LG GR-B772GSPH
      Samsung RT56H6679SL

      both of these are BEE 3 star rated models. Hitachi also has some models in BEE list that are 4 star rated, but these models are not available in market. If you are looking for side-by-side models, then all I would say is look for models with inverter technology compressor. Sharp is a good brand with good value for money, but their service is patchy at places. However it would be good if you are in a big city (heard good feedback in Mumbai). The model you mentioned does not have inverter tech compressor. There are couple of benefits of inverter tech: 1) It save about 30-40% on electricity consumption 2) It gives consistent cooling so food remains fresh.

      • Pankaj says:

        Thanks Abhishek, I am in Delhi so am assuming Sharp service will be reasonable. Also one thing, usually the side shelves of refrigerators get cracked easily. Will buying Sharp product at least lower the possibility of cracking as I presume they have better quality than samsung/LG etc. Also are these parts available just in case it breaks.

  5. Kristhy says:

    Thanks a lot !! Your explanation is very helpful .
    Kindly suggest me any good model of 250 to 300 litres Frost Free with cooling gel technology
    does cooling gel technology really keeps it cool for at least 2 to 3 hours
    The fridge dealer in my place is of the opinion that direct cool keeps stuff cool for at least 3 to 4 hours because of the ice formed inside compared to frost free. I want your expert opinion
    Thanks a lot once again

    • Abhishek Jain says:

      You can look at:

      LG GL-E302RPTL
      LG GL-P302RPJL
      LG GL-D292RPJL
      LG GL-E292RPTL
      LG GL-P292RPJL
      Whirlpool Neo IC 305
      Whirlpool Neo IC 275 (has deep freezer with chilling gel)

      These can keep food cool for 9-10 hours in power cuts. And this is different from what the direct cool refrigerator does. Although if ice is formed, even direct cool can keep food cool for some time.

  6. Kristhy says:

    How long the frost free refrigerator will keep cool in case of power failure ?

    • Abhishek Jain says:

      As I said it all depends on technology. Some Frost Free refrigerators also have cooling gel technology that can keep the refrigerator cool for 9 hours during power cuts.

  7. Kristhy says:

    Hi Abhishek
    I am planning to buy a refrigerator, can you suggest me few options – my criteria are below
    1. Volume less than 300 litres
    2. There is a not much electricity problem in my area, so looking for a product which is good in 1/2 to 1 hours long power cut.
    3. Cost around 15 thousand
    4. Exclusively to keep fish, meat& vegetables
    5. You Can suggest any good brand .. I am not particular to this.
    6. How long the frost free refrigerator will keep cool in the power cut
    7.Which one is good direct cool or frost free from cooling point in area where 1 to 1&half hours power cut
    8.Difference between direct cool & frost free refrigerator

    • Abhishek Jain says:

      Hi Kristhy,

      It will be difficult to get a 300 lts fridge at around 15 thousand. You can get refrigerators of around 200 lts in that budget. Brands like LG and Samsung have technologies to store cooling in gel which can be used during power cuts. LG claims that it’s power cut evercool technology can keep the refrigerator cool for 9 hours during power cuts.

      Also it will be difficult to get frost free refrigerator in your budget. Direct Cool refrigerators are single door refrigerators that need manual defrosting. Which means ice accumulates around the freezer and you need to switch it off periodically to remove the ice. Frost free refrigerators do this automatically and you need not switch off the refrigerator.

  8. AKASH PARMAR says:

    Hello Abhishek,

    I want to buy low coast refrigerator around 15k of 190 Ltr. But I am confused in brand. My choices are LG and Samsung.
    I tried searching over internet but could not come to decision that which one is better brand..?
    Please guide me which refrigerator should I purchase..? LG or Samsung..?

    • Abhishek Jain says:

      Although they are almost equally energy efficient. Samsung provides slightly more volume with slightly less energy consumption. So you can go for Samsung.

  9. Vandana says:

    Hi Abhishek we plan to buy a 550/ 600 l refrigerator with a higher fridge is to freezer ratio. Also there is a lot of confusion in the market regarding an inverter tech. compressor. As per my understanding, truly invertor compressor refrigerators or ac s should not have a star rating. How come most of the brands are advertising inverter compressor refrigerators, but also have a star rating alongside? To me, it appears like an advertising gimmick rather than anything else. The only refrigerators with invertor tech compressors are Hitachi or Panasonic, I think. Could u pl clarify this for me and also suggest a good model for my needs?

    • Abhishek Jain says:

      Hi Vandana,

      There is no star rating for Inverter Tech ACs, but there is star rating for double door inverter tech refrigerators. Side-by-side, Multi door and bottom freezer refrigerators are not rated on BEE star rating yet. Hitachi and Panasonic have inverter technology refrigerators in bigger size (in the size range that you are looking for), however most of them are side-by-side and multi door that are not rated on BEE star rating. In fact Hitachi also has 6 double door models registered as BEE 4 star rated refrigerators, but they are not available in market. The only double door refrigerators (of the size you need), that are registered on BEE star rating are these 3 that are BEE 3 star rated:

      LG GR-B772GSPH
      SAMSUNG RT56H6679SL
      SAMSUNG RT54H6679SL

  10. sameer says:

    Hi Abhishek,, I am planning to but a 450-500 ltrs double door refrigerator. I was thinking iof buying Bosch. Any feedback on bosch?. I live in mumbai so is service an issue? And what are the best invertor tech refrigerator in this segment?

    Also 2nd question is, we need smaller freezer so is there a 80:20 ratio in some models . Mostly i found 70:30.

    Pls guide.

    • Abhishek Jain says:

      Hello Mr Sameer,

      If you need less of freezer space then you should look at convertible freezer models from Samsung having digital inverter compressor (e.g. RT45H5809SL). In this you can use the freezer space as refrigerator when needed. This models is BEE 3 star rated. Bosch models are BEE 2 star rated and do not have inverter tech compressor.

  11. Abby says:

    Hi Abhishek,
    This is very helpful and explained it in a way that non-technical people will understand. Thank you very much. Can you help decide between LG’s Linear Inverter and Samsung’s Digital Inverter. Which is better in terms of energy efficiency pls? Thanks!

    • Abhishek Jain says:

      LG in general has more energy efficient models as compared to Samsung. You can check the list at http://www.bijlibachao.com/top-ten-appliances/what-are-best-refrigerator-fridge-lg-samsung-whirlpool-india.html

  12. Ajayk says:

    Hi Abhishek,

    Can you please suggest which is the best one out of the below mentioned.

    1: LG GL-M522GSHM(SV) Frost Free

    2: Samsung RT49H5679SL

    Consider all the factors energy saving, after sales service and long term working product.

    • Abhishek Jain says:

      Hello Mr Ajay,

      LG GL-M522GSHM is a BEE 4 star rated refrigerator with rated electricity consumption of 290 units a year. Samsung RT49H5679SL is a BEE 3 star rated refrigerator with rated electricity consumption of 360 units a year. Both are inverter technology refrigerators, so good products. The price difference between the two is quite less. The LG model will save more electricity for you because the rated difference is 70 units, which will turn out to be a difference of about 100 units on use (because usage units are 30-40% higher than rates units in refrigerators). So depending on your rate of electricity you can work out the energy savings for 100 units a year.

      Now from after sales service perspective both LG and Samsung have similar standings. Depending on location one brand may be better that the other, but on the whole, both are equally good. So I think LG will be a better option for you.

  13. chhaya says:

    Hi Abhishek

    We are planning to buy 300 – 400 litre capacity refrigerator. I have heard that LG and Samsung will b best. Would like to know from you that which brand should we go for so that for next many years we don’t have to think of changing it.

    Rods
    Chhaya

    • Abhishek Jain says:

      Hi Chhaya,

      Both LG and Samsung have inverter tech refrigerators in this range, which is the technology to look for. Most of Samsung models are BEE 3 star as per 2014 ratings. LG has 5 and 4 star rated refrigerators as well.

  14. Vishnugopal VG says:

    What is the difference between lg inverter linear compressor and the newly launched smart inverter?

    • Abhishek Jain says:

      Linear inverter is LG’s technology where the movement of compressor is linear instead of reciprocating. LG claims that it is more energy efficient that regular inverter compressor. And all inverter compressors are called Smart Inverter because they adjust according to the need of the system.

  15. Bhargav says:

    Abhishek,

    Just wondering about haier three door refrigerator with inverter technology. Apart from Hitachi only haier is providing economical three door fridge. What are the views for haier ?

    Thank you
    Bhargav

    • Abhishek Jain says:

      Hi Bhargav,

      Just looking at BEE data I can see Hitachi having lot more BEE 4 star rating models whereas Haier is mostly 2 and 1 star and some 3 star rated models. I cannot give you data more objective than this to give a comparison.

  16. asis patnaik says:

    Compresser is on always in inverter technology there by will not get any rest. Breakdown of compresser will be there or not ?

    • Abhishek Jain says:

      companies give warranties on compressors. LG and Samsung give 10 years warranty on inverter compressors.

  17. Vikasa says:

    Hi…plz suggest a Best energy saving fridge 340 to 360 litres? And how come the same model Samsung fridge RT36FDJFASL is 5 star rated in 2013 & 3 star rated in 2014? My cousin has brought the above mentioned 2013 model this year, so is that means his fridge is 3 star efficient only. Kindly clarify please.

    • Abhishek Jain says:

      Try LG GL-D402RSHM or GL-D402RPHM or GL-D402RLJM. The BEE star rating standards have been revised in 2014, so some of the refrigerators have come down in ratings. So yes the refrigerator you mentioned is BEE 3 star.

      Hope this helps.

      Regards,
      Abhishek

  18. jagat says:

    Hi Abhishek,

    I have a doubt regarding inverter technology.. if an inverter ac cools the room to desired temprature while working at its minimum capacity and if temp drops further then will its compressor turn off for some time as a normal ac?? actually i see many time the fan of my 2ton Mitsubishi ac outdoor unit turns off and then on even the daikin 1,5ton ac in other room does the same. If this happens does it have any bad effect on the life of compressor???

    • Abhishek Jain says:

      Hi Jagat,

      Inverter ACs are designed in such a way that the compressor never turns off. Firstly let me tell you that even if the thermostat senses that the optimum temperature has reached, the flow of heat into the room does not stop. If your room is cooler than the outside temperature, the heat will flow into the room continuously. It does not stop even for a moment. What the inverter AC does is that it optimizes the speed of the compressor in such a way that the rate of heat it takes out from the room is same as the rate of heat coming into the room. So initially it does run at a higher speed (to reduce the temperature), but it stabilizes at a consistent speed once the rate at which it is taking out heat is equal to rate at which heat is coming in.

      Thus it is also said that inverter ac is much more consistent in maintaining temperature, as the temperature will never go down from what you have set on thermostat. Whereas in a fixed speed AC the temperature may go down about a degree centigrade more when it stops.

      Hope this helps.

      Regards,
      Abhishek

  19. Murali says:

    Which is best Inverter Technology Fridge available in 200-300L Range ?

    • Abhishek Jain says:

      Hi Murali,

      Below are the most efficient AC models in 200-300 L range as per BEE data. Most of them are inverter tech models:

      S.No Brand Name Model Number Gross Volume(Litres) Storage Volume(Litres) Electricity consumption (unit per year)
      1 LG GL-D302RPJL 285 259 242
      2 LG GL-D292RPJL 258 237 238
      3 LG GL-E302RPTL 285 259 242
      4 LG GL-M302RATL 285 259 242
      5 LG GL-M302RLTL 285 259 242
      6 LG GL-E292RPTL 258 237 238
      7 LG GL-M292RATL 258 237 238
      8 LG GL-M292RLTL 258 237 238
      9 SAMSUNG RT29HDRZESA/TL 275 255 248
      10 LG GL-P302RPJL 285 259 242
      11 LG GL-P292RPJL 258 237 238

      Hope this helps.

      Regards,
      Abhishek

  20. Gurpreet Singh says:

    Hello Abhishek,

    Thanks for your valuable and precise inputs about the inverter technology of refrigerators.

    Which company provides the best Split ACs with inverter technology in 1.5 ton ?

    Thanks in advance.

    Gurpreet Singh Sidhu

    • Abhishek Jain says:

      Hello Mr Singh,

      Personally from a technology point of view we have a preference for Japanese brands, but truly every brand has its own pros and cons. But all brands offer inverter technology AC in 1.5 ton.

      Regards,
      Abhishek

      • Gurpreet Singh says:

        Hello Abhishek,

        Prior to buy split Inverter AC, I want to know what would be the Tonnage of the Air Conditioner for following:-

        *Area (sq. ft) – 130
        *Height of the room. – 10 ft
        *Usage of the room – Bedroom
        *Maximum No. of Persons in the room at any given point of time. – 3
        *There is no wall which that is directly exposed to sunlight
        *Even roof is not exposed to sunlight

        Regards,
        Gurpreet Singh

        • Abhishek Jain says:

          Hello Mr Singh,

          The best thing about inverter tech is that it can auto adjust to your need. So even if you go for a 1.5 ton inverter tech AC and your room needs only 1 ton, then it will auto adjust its tonnage. However to tell you the right tonnage I need to know the city where you are based.

          Regards,
          Abhishek

          • Gurpreet Singh says:

            I live in NOIDA

          • Abhishek Jain says:

            Hello Mr Singh,

            A 1 ton inverter tech AC would be enough for your room. Below are some brands/prices that we got from the internet:

            LG BS-Q126B8R8 Max tonnage 1.15 ton, Price about Rs 39,999 (on compareindia)
            LG BS-Q126B8A4 Max tonnage 1.15 ton, Price about Rs 42,990 (on reliance digital)
            Sharp AH-XP13LV Max tonnage 1.2 ton, Price about Rs 31,700 (on compareindia)
            Carrier Kurve Inverter AC, Price about Rs 35,488 (on compareindia) — Carrier also has a superia inverter range for which price is not known to us.
            Daikin 1 ton Inverter FTKE35, Price about Rs 35000 (on snapdeal)
            Mitsubishi has MSYGE13VA (price of which is not known to us).
            Voltas Delux (DC Inverter) 12V DX 1.0 Ton, Price about Rs 39,990 (on Naaptol)

            Hope this helps.

            Regards,
            Abhishek

  21. vijay says:

    why it is the difference between Inverter compressor and linear inverter compressor

    • Abhishek Jain says:

      Hi Vijay,

      Inverter Technology adjusts speed of compressor motor depending on the heat load in the refrigerator. A regular compressor motor has a rotational movement. LG has a proprietary technology which it calls linear compressor where the movements are linear instead of rotational. LG claims that it saves electricity. Now they have combined the inverter technology with their linear compressor technology and call it linear inverter compressor. So logically thinking linear inverter compressor should have benefits over regular compressor, but the effect needs to be studied and we at Bijli Bachao have not done any research on that yet.

      Hope this helps.

      Regards,
      Abhishek

  22. bhavesh soni says:

    Hello Abhishek,

    I love the direction you work in!! congrats.

    can you guide me apart from SAMSUNG what are other economical models available with inverter tech.

    I have heard about this

    Panasonic NR-B295STW4.

    I am looking aroung 260-300 litre..
    Again thanks!!

    • Abhishek Jain says:

      Hi Bhavesh,

      There are several brands that make inverter tech refrigerators. In fact these days almost all brands have a few models that are inverter tech. But not all brands have models in all sizes. Most brands including panasonic have inverter tech in model of sizes 400 lts and above. I checked the model you mentioned online and it does not have inverter technology. Samsung is the only brand that has inverter tech in smaller size refrigerators. Haier has few that are less than 400 lts but still they are bigger than your requirement. You may also look at BEE 5 star rated refrigerators of the size you need (although inverter tech may save 20% or more electricity as compared to regular ones). Please note a 5 star refrigerator of 260-300 lts would consume about 1.5-1.75 units a day.

      Hope this helps.

      Regards,
      Abhishek

      • bhavesh soni says:

        Thanks Abhishek!!

        Precisely samsung digital inverter does the job neatly. Also as mentioned in reference PDF http://www.panasonic.com/industrial/includes/pdf/invertercompressors-improvingefficiency.pdf

        These refrigerators do work efficiently. :)

        • Abhishek Jain says:

          Inverter tech uses variable speed motors that help it adjust its speed according to the system requirement. Regular compressors have fixed speed motors and are mostly sized for higher capacity which is not always the case as seasons change and heat in the environment varies. Inverter tech is elastic and thus more efficient.

  23. Prasad Mayya says:

    very useful info as usual…. but i found your website very late….

    • Abhishek Jain says:

      Thanks. I am glad that you found it useful. Do sign up for our monthly newsletter to get regular updates.

      Regards,
      Abhishek

  24. sasikumar says:

    it very good, thanks this is same method to air conditioner compressor

    • Abhishek Jain says:

      That is right, the method is same for air conditioners as well. And because of their capability to vary capacity, they save energy. I am glad that you found the information useful.

      Regards,
      Abhishek

  25. Shwetha says:

    nice info…so, if is better I opt for an inverter based refrigerator, if I want to power it using solar energy…since the compressor does not turn ON or OFF but only varies the speed of operation, the surge is usually very low or non existent..am I right?

    • Abhishek Jain says:

      Hi Shwetha,

      You can use PV system with any kind of refrigerator (inverter tech or regular). Just that the sizing of the system must match the maximum power requirement of the refrigerator. You will need a PV module, charge controller, batteries and DC/AC inverter to connect to the refrigerator.

      Regards,
      Abhishek

  26. mayur says:

    This is very helpful information.

    Thank you

    • Abhishek Jain says:

      Thanks Mayur. You can sign up for our monthly newsletter through which we provide latest updates on the website.

      Regards,
      Abhishek

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