Electricity Saving Tips For Homes And Offices

Refrigerators with Inverter technology can help save electricity

By on April 19, 2015
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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.

Refrigerator Inverter

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

Lesser known benefits of Inverter Technology

  • Regular motors need 3-4 times more current (more than running current) at startup. So the inverter/generator size needed to run any AC or Refrigerator increases significantly. But Inverter Technology air conditioners and refrigerators have variable speed motors that start up gradually needing much lesser current at startup. Thus the size of inverter/generator required to startup is less. For e.g. A 1.5 ton fixed speed AC that runs at about 10 Amp current may need up to 30 Amp current at startup and thus a 5 kVA inverter/generator. But an inverter technology Air Conditioner needs about 6-7 Amp current and not much more at startup and thus a 1.5 kVA or 2 kVA inverter/generator is good enough to support it.
  • Regular motors have much lower power factor. In commercial and industrial connections there is penalty for low power factor and rebates for higher power factor. An inverter technology motor will have power factor close to unity (or 1) which not only results in lesser electricity consumption but also help get rebates on better power factor.
  • If you are planning to use Solar PV for air conditioner, then it is the best to use inverter technology air conditioner or refrigerator as it not only reduces the size of PV panels because it consumes lesser electricity, it also reduces the size of inverter to be put along with the PV panel.

Here is a short video for tips to buy the best refrigerator in India

Source of Information:

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

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


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There Are 134 Comments

  1. Sriram says:

    Hi,

    I am planning to Buy this refrigerator “Samsung RT27JARYESA/TL 253 L Refrigerator” is this good? does this work on Inverter technology?
    could you please suggest some alternatives in 230 – 270 litres please.

  2. Vaibhav says:

    Dear Abhisek,
    I am planning to buy inverter based refrigerator about 400 to 500 liters capacity. Which is better Panasonic inverter refrigerator or LG smart inverter ???

    • Bijli Bachao Team says:

      Hi Vaibhav,

      If you are looking for BEE Star rated inverter refrigerators then Hitachi, LG and Samsung have some models. Panasonic has models that do not have freezer on top. They have more of bottom freezer and side by side models that are not rated by BEE. These are some of the BEE star rated models in your capacity range:

      Brand Model Number Gross Volume(Litres) Electricity consumption (unit per year) Star Rating Price
      HITACHI R-VG540PND3 489 317 4  
      HITACHI R-V540PND3K 489 317 4  
      HITACHI R-V540PND3KX 489 317 4 70000
      LG GL-M472GLJM 420 282 4 43100
      LG GL-M472GSHM 420 282 4 47200
      LG GL-M542GPHM 495 299 4 54600
      LG GL-M472GPHM 420 282 4 48600
      LG GL-M522GSHM 470 290 4 52500
      SAMSUNG RT42HDAGESL 415 281 4 48333
      SAMSUNG RT42HAUDEGL 415 281 4 51933
      SAMSUNG RT47H567ESL 462 296 4 54633
      SAMSUNG RT49H567ESL 481 299 4 59000
      • Vaibhav says:

        Thank you, Can I ask why there are not any star rating’s for bottom freezer with inverter technology??

        • Bijli Bachao Team says:

          HI Vaibhav,

          We are also not very sure why other types of refrigerators are not included in star rating.

  3. Ayubhusen says:

    Dear Abhisek,
    I am interested to buy inverter based refrigerator about 350 to 400 lts. capacity with top freezer and my budget is 40k to 50k INR. So let me suggest which brand is best for me.
    thank you.

    • Bijli Bachao Team says:

      Hi Ayubhusen,

      You can look at these models:

      Brand Model Number Gross Volume(Litres) Electricity consumption (unit per year) Star Rating Price
      LG GL-D402RPHM 360 256.92 4 42014
      LG GL-D402RPJM 360 257 4 42833
      LG GL-P402RPJM 360 264 4 41200
      LG GL-P402RSJM 360 264 4 41000
      SAMSUNG RT39HDAGESL 393 276 4 43500
  4. Avishek says:

    I want to buy a Samsung Inverter Technology Refrigerator, 275L with 5 Star power savings. The model number is RT29JDRZFSA. I want to know whether this fridge is worth buying or not. Please suggest me the pros and cons for this particular model.

    • Abhishek Jain says:

      Samsung Inverter Technology Refrigerator, 275L with 5 Star power savings has inverter technology so it will be able to keep the vegetables fresh for a long time. It has a power consumption of 195 units/year. We could not find any details about it on Samsung website so we cannot comment more on it.

      • Avishek says:

        Thanks, please suggest the best fridge of 275 L of your choice..

        • Abhishek Jain says:

          You can look at these Samsung refrigerator models:

          SAMSUNG RT29JDRZFSA/TL
          SAMSUNG RT29HDRZESA/TL
          SAMSUNG RT29HARZERY/TL
          SAMSUNG RT29JARYESA/TL
          SAMSUNG RT29JARZESP/TL
          SAMSUNG RT29JAMSESZ/TL
          SAMSUNG RT29JAMSERZ/TL
          SAMSUNG RT29JAMSEPZ/TL
          SAMSUNG RT29JARZEPX/TL

  5. Jayesh Dutia says:

    Dear Abhishek,
    Thanks very much for your response. Considering that I live in Baroda Gujarat, service for Hitachi will be a question mark. So I think I will go with Panasonic or Samsung. Also, wanted to check if LG is a good choice when compared to Samsung Double door with inverter technology for 500+ Litre fridge. Please advise.

    • Abhishek Jain says:

      Both LG and Samsung are good. I cannot say that one is better over other. Both have good number of energy efficient models in the market. The choice will depend on how good their service is in your area. And for the feedback on the same, your best source would be local dealers and users of the brand.

  6. Jayesh Dutia says:

    Dear Abhishek,

    I am planning to buy a Double Door Fridge with capacity of 500+ Litres. I want to go for Invertor Technology for reducing the power costs. Please suggest which is the best value for money from among Samsung, Panasonic, LG, IFB, & Hitachi

    • Abhishek Jain says:

      You can go for Hitachi or Samsung. You can look at these:

      HITACHI R-V610PND3K 565
      HITACHI R-VG610PND3 565
      HITACHI R-V610PND3KX 565
      SAMSUNG RT54H667ESL 528
      SAMSUNG RT56H667ESL 555

  7. Uday says:

    Hi Abhishek,

    I thought inverter range is beyond star ratings. How come inverter fridges have star ratings as well? I don’t see the same thing applied to Inverter ACs. I haven’t been able to find anything on this topic online. Can you please explain? Also, none of the e-tailers seem to have any 5 star inverter range fridges.

    Can you also suggest a couple of inverter fridges in the 300-400 liter range? I don’t mind if it’s little costly upfront as I know the small difference in cost will save big in running expenses.

    Regards,
    Uday

    • Abhishek Jain says:

      Hi Uday,

      In case of air conditioners the star rating is provided on the value of Energy Efficiency Ratio (output watts/input watts), for inverter ACs this value is not constant and thus comparing ACs (inverter and non inverter) on EER values is not possible and thus inverter ACs are not provided star rating. However in case of refrigerators, the star rating is provided on annual electricity consumption. And it is easy to measure annual electricity consumption for both inverter and non inverter refrigerator. And thus inverter tech refrigerators have BEE star ratings.

      Now there are very few (about 6-7) refrigerators that are BEE 5 star rated. In 2014 BEE revised their star ratings and made them more stringent. So the old BEE 5 star rated refrigerators moved to BEE 3 star. You can look at these refrigerators:

      BEE 5 star rated refrigerators:

      LG GL-D322RPJZ 310 lts
      LG GL-D322RSJZ 310 lts
      Samsung RT36JDRZFSL/TL 345 lts

      BEE 4 star rated refrigerators:
      LG GL-D402RSHM 360 lts
      LG GL-D402RPHM 360 lts
      LG GL-D402RLJM 360 lts
      SAMSUNG RT39HDAGESL 393 lts
      SAMSUNG RT39HDJTESP 393 lts
      LG GL-D402RPJM 360 lts
      LG GL-P402RPJM 360 lts
      LG GL-P402RSJM 360 lts

  8. sudipto says:

    i am planning to buy whirlpool 240 ltr. FP 263D PROTON ROY FIN (N) Refrigerator with vegetable drawer option available in this model. Is it advisable to buy this product? How good the refrigerator performance is in regard to power consumption and cooling technology? please suggest. Budget is between 25k and my requirement is 240 to 260ltr fridge.

    • Abhishek Jain says:

      Hi Sudipto,

      This Whirlpool model is a 3 door model and BEE has not rated 3 door models yet, so I cannot comment on it’s power consumption. Whirlpool as a brand typically has good BEE 3 and 4 star models, so I would assume that this specific model would not have bad compressor to consume a lot of electricity. But technical data for the same is not available. Most whirlpool models have sixth sense technology which is good for maintaining ideal temperature for keeping food fresh. However in my opinion Inverter Technology compressor is better in saving electricity along with maintaining the right temperature. Are you looking for 3 door models only?

  9. ranjana says:

    hai abhishek

    can u tell me the difference btw this models?

    1.LG GL M292 RLTL (PV)
    2.LG GL M292 RLTL (PZ)

    which is best to buy?

  10. Raghu says:

    HI Abhishek,

    I want to buy a double door refrigirator of 250 ltr. Could you please suggest a most efficient and economic good one model.

    Thanks in advance,

    Raghu.

  11. sandeep shah. says:

    dear abhishekji we are planning to buy a referegarator of about 500lit to 600lit ..What about SHARP SJ PK 64 G SL .It is of 585 lit .regular -compressor .they say it is of 4 bee star rating.please suggest us about it or of any other modles. thank u .

    • Abhishek Jain says:

      Sharp does not have any model with BEE 4 star rating as per revised standards in 2014. These are models with 4 star rating as per 2013 ratings. You can go for any of the Hitachi, Samsung or LG model with inverter technology compressor.

  12. Richard SMith says:

    Will the new Digital Inverter Compressors work with a Modified Sine Wave Inverter used in most older recreational vehicles or is an upgraded Pure Sine Wave Inverter required?

  13. raghu prathap says:

    HI Abhishek, You are doing Great help around here. It is helpful verymuch. I want buy a refrigirator of 195L >capacity<240L of single door. My budget is 15k INR. Please suggest a good refrigirator with inverter tchnology and power saving one also. I am seing there is no inverter tch for single door refrigirators. Is my assumption correct?

    • Abhishek Jain says:

      Hi Raghu,

      You got it right. There is no inverter technology in single door refrigerators. You can look at these single door refrigerators that are the most efficient in the category and budget you are looking for:

      LG GL-225BAD5
      LG GL-225BDD5
      LG GL-225BM5
      LG GL-225BMG5
      SAMSUNG RA20GCPR1/CTL
      SAMSUNG RA20GCRR1/CTL

      These refrigerators are equally efficient as the smallest double door inverter tech refrigerator in the market.

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