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Home Inverters :How to Select the Right Inverter for your House

Updated on January 5, 2009

Selecting the right inverter for your home has become a tough task these days. There are so many terms we need to understand - 800VA/ 1000VA, Tubular Batteries/ Flat Batteries, Half Load/ Full Load and the list goes on. And on top of all these, availability of multiple power back up solutions and misleading information provided by sellers have further added to buyers woes. So I did some research and study before buying an inverter for my home and I'm sharing the details of same so that you don't have to go through the same problems while buying an inverter.

So What do You Need - UPS or Inverter?

This is one of the basic confusion people face, so let me start with answering this first. UPS and Inverter are words used interchangeably though there are not exactly same. UPS (Uninterrupted Power Supply) is just a system which allows INSTANT switchover to the power back-up source in case of a power failure. The power back-up source can be a battery or something else. Whereas an Inverter is a system which converts direct current to alternate current hence enables using a battery for backing up equipments running on AC power supply. Inverter uses a battery to provide power back-up. Computer UPS comes with in-built battery which works as back-up power source and can provide back-up for 15min. to 30 min. So if that much of back-up is sufficient for you, you should be fine with buying just a UPS for your need. But Inverter comes with more powerful battery and can provide support for electrical equipments, computers, home appliances etc. and also gives more hours of back-up. Most of the inverters come with in-built UPS which ensures that power failure doesn't cause fluctuation and your system switches instantly to Inverter's Power Back up battery.

What Capacity of Inverter is Good for Your Home?

Once you are sure that you are looking for an Inverter, it's important to calculate the capacity of Inverter that will suit your requirement. Following table will give you brief idea about the power consumed by various equipments.

Tubelight - 60W

Fan - 70W

Television - 120W

Laptop - 100W

CFL - 25W

Modem - 50W

Now you are in a position to understand as what capacity inverter do you need and I'll let you do that in 3 simple steps -

1. Calculating your power need

Now I'll explain you how to use above table to calculate the right capacity Inverter for your need. Let's say you need Inverter to run 2 Tube lights, 3 Fans, 1TV and 1 Laptop. As per the table above, you'll need a total power of 550W(=2X60 + 3X70 + 1X120 + 1X100) to support all of your equipments at the same time.

♣ Your Total Power Need = 550W

2. Calculating required inverter's capacity

Now that you know how much power is required, it's easy to get the VA rating of inverter. In ideal condition, the VA rating would have been same as the power need i.e. 550VA. But in practical conditions, the power factor of Inverter is less than 1 hence power supplied by 550VA Inverter won't be 550W but lesser than that. Assuming power factor of Inverter to be 0.7, following are the details of calculation -

Required VA of Inverter X 0.7 = 550W

♣ Required VA of Inverter = 550/0.7 = 786 VA

Now luckily we have inverters available in the market with 800VA capacity, so such inverters will fit into my requirement.

3. Calculating battery capacity

Till now, you will have clear understanding of the Inverter capacity required for your need. But the next question is that how much back up will the inverter provide and for how many hours you can run all of your equipments. And that's where battery capacity comes into picture. It's the battery which determines the back-up hours. The higher capacity battery you have, the more back-up hours you'll get. So lets get into the calculation fast.

Required power(in Wattage) X Required back-up hours(in Hours) = Inverter Voltage(in Voltage) X Battery Capacity (in Ampere Hours)

Let's look for an Inverter which can give back-up of up to 3 hours, so for our case -

550W X 3Hours = 12V X Battery Capacity

♣ Battery Capacity = (550 X 3)/12 = 137 Ampere Hours

So we need a battery of 137AH capacity but if you check the market you'll find batteries of 130AH capacity. So that should be more or less sufficient for your need.

Conclusion

Finally, we have come to the conclusion that if we go for 800VA Inverter with 130AH battery, I can run 2 Tube lights, 3 Fans, 1 TV and 1 Laptop for up to 3 hours. And by the end of this article you don't need to rely on sellers for understanding your need as you can do the calculations yourself in just 3 simple steps. Hope this article helps you in some way in making the right decisions. Let me know if you need any other inputs.

 

 

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    • profile image

      jagdish brahmbhatt 18 months ago

      Thanks,very useful guide.please kip it up.

    • profile image

      Aamer 23 months ago

      Thank u.

    • profile image

      ashok dass 23 months ago

      Thank you v much....

    • profile image

      yuvaraj 23 months ago

      thank you its very useful for me. now iam cleared

    • profile image

      SSREDDY 24 months ago

      Thank You So Much. It saves my time to find the correct Inverter to my home.

    • profile image

      Tandon 2 years ago

      Good Information! If anyone looking for new inverter battery and inverter than go to Batterybhai.com

    • profile image

      Debarchan 2 years ago

      Very helpful.

    • profile image

      mahendra sharma 2 years ago

      very very good artical I like it very much it is very helpful

      thanks

    • profile image

      DEVENDRA 2 years ago

      Thank you very much...very good information...

    • profile image

      Prasad.R.Pillai 2 years ago

      Very useful information.

      Thanks

    • profile image

      T.Vijayan 2 years ago

      I am having a GCI Omnik 2kwx220dcv inverter and another Off Grid invert2.2kwX48v having 12VX150AH=4nos

      During Power failures i want to take the 230V Supply from off grid with a changeover switch from grid to off grid supply as supply to On grid Inverter.Will there be any reverse power to off grid during reduction load demand

    • profile image

      Sagar 2 years ago

      Super theoretical explanation which can help anybody to decide the right thing.

    • profile image

      Dev, east of kailash 2 years ago

      Just superb! Described so simple way and put simple fundamentals that really made easy to understant.

    • profile image

      Gull Nawaz 2 years ago

      thanks a lot dear. you made my choice very clear

    • profile image

      Nat 2 years ago

      simple and straight forward.

    • profile image

      Ganesh gaur 2 years ago

      Great brother m thanks to u for sharing this to us.

    • profile image

      kunal 2 years ago

      Hi. Thanks for the details and spcifications. It is really useful. If I wat 6 hrs of back up what size of battery should I buy??

    • profile image

      Rahul 2 years ago

      Hi I am looking for 550w output and 10 hours of back-up. Can you plz advive.

    • profile image

      jasmin 2 years ago

      Thank you . It help me a lot

    • profile image

      vasant Kumar 2 years ago

      Thanks a lot now i know the basic information which every one should need to know.

    • profile image

      MUSTHAFA 2 years ago

      Thnk u vry vry much. Ths informatn was vry... usfl fr me.

    • profile image

      mutalib 2 years ago

      70 watt

    • profile image

      Prasad 2 years ago

      It was brilliant KSETU.

      Very useful for a customer to get cleared with his requirement.

      Thanks a lot

    • profile image

      CHANDRASEKHAR A 2 years ago

      Thankyou very much. You made the math behind choosing inverters simple.

    • profile image

      3 years ago

      Nice one and every body a lane man can have a idea to what type of inverter he has to purchase..........Prasad dvv

    • profile image

      krunal 3 years ago

      Thanks. so easy. Well written

    • profile image

      shreyas 3 years ago

      Nice article , Thx for sharing

    • profile image

      balaji 3 years ago

      It was very help full. Thank you verymuch

    • profile image

      mithun 3 years ago

      thanks... it's helpful :)

    • profile image

      ANKIT 3 years ago

      good article

    • profile image

      Ajith trivandrum 3 years ago

      very very nice!!!!!!!!!!!.

    • profile image

      vakkalagadda eswar 3 years ago

      suppose i want an inverter of 1000w for 4 hours a day,

      then 1000wx4 hours = 12 vx battery amp-hours

      or Amp-hours = 4000/12 = 334

      dividing by the power factor of 0.7= 477 Ah

      now my little query is that this 447 Ah= how many battery units, so that with the inverter, the required number of battery units can be purchased.

      hope both my queries will be looked into . thanks. i have bookmarked this page of yours too.

    • profile image

      vakkalagadda eswar 3 years ago

      I COULD NOT UNDERSTAND THE TWO LINES RELATED TO THE POWER FACTOR. WILL YOU PLEASE CLARIFY ON THIS.

      IT STATES:

      Required VA of Inverter X 0.7 = 550W

      ♣ Required VA of Inverter = 550/0.7 = 786 VA

    • profile image

      Zaheer 3 years ago

      Woow...gr8 explanation...made things difficult for sellers..now v can choose what exactly we require.

      Thanks

    • profile image

      Vishal 3 years ago

      very helpful..

    • profile image

      KVAPPARAO 3 years ago

      VERY HELPFUL TO DECIDE WHICH ONE TO BUY, ENTHRALLED EVEN AFTER FOUR YEARS.,,, THANKS SETHU. NANRI

    • profile image

      Balan 3 years ago

      Very nice article for the users like me who are new to inverter buing . . .

    • profile image

      Giriraj 3 years ago

      Hi Admin,

      I have narrowed down to three options

      1)Sukam shiny 850 VA sine wave UPS + exide IT500 battery(150aH)

      2)Sukam shiny 850 VA sine wave UPS + sukam tall tubular battery(150aH)48months warranty

      3)Exide original Inverter 850 va with LCD display+ exide IT500 battery(150aH)

      which one is the best configuration,my priorities are in following order

      1)performance

      2)service

      Thanks,

      Gririaj

    • profile image

      Kiran 3 years ago

      Thanks Dude, very nice and detailed explanation.

    • profile image

      Kondeti 3 years ago

      Thanks for sharing such an important information.. it's very useful and easy to understand..

    • profile image

      rdugg 3 years ago

      Please let me know if there is any preferred brand inverter. Any feedback on V-Guard inverter.

      Thank you

      Rdugg

    • profile image

      VamcKasyap 3 years ago

      Thank you so much. Very help full article

    • profile image

      Harish 3 years ago

      This article explained me about the Selection of Inverter in very simple and crisp language.

    • profile image

      yyneedu 3 years ago

      Your information for selecting invertor and battery is very usful.You would have also consider the cfficiency of battery, which will normally 80 to85 percent.

    • profile image

      Multan ge 3 years ago

      Very nice and simple to understand. Good job

    • profile image

      rajiv ranjan 3 years ago

      Thanks for great and important information.

    • profile image

      Abhishek 3 years ago

      I want to run 1 40" LED and a tata sky connection at the same time.....what kind of inverter should I buy/use??

    • profile image

      Sachin 3 years ago

      thank yo for sharing very useful update with Us

    • profile image

      praveen 3 years ago

      The above info leaves out very important information about fusing and cable sizing - a 1000w inverter will draw 80+ amps at full load and that needs an appropriately fuse to protect the cabling. The cable sizing between the inverter & battery should not only be large enough take into account the amount of current to be drawn but also to minimise the voltage drop.

      Praveen

      http://india.dialus.com/businessdetails/Hyderabad/...

    • profile image

      Saini B 3 years ago

      thanks for the important facts. i want more information regarding how much MW of solar panels are required for the same load.

    • profile image

      ramesh 3 years ago

      thank u very much for posting valuable information this is useful to all thanks once again

    • profile image

      Krishna Murthy 3 years ago

      This is nice information, thank you....

    • profile image

      swapnil 3 years ago

      Very useful information

      Thanks...

    • profile image

      rizwana 3 years ago

      Very useful thanks alot

    • profile image

      Anjan 3 years ago

      Thnks... 4 ur well explanation...

    • profile image

      farhana 3 years ago

      Thnk u vry vry much. Ths informatn was vry... usfl fr me.

    • profile image

      shubham 3 years ago

      Very helpful article. I have been thinking which is the appropriate inverter for my house. But didn't know what should be the power of inverter and the battery capacity which is sufficient for my house. But after reading this article I know which inverter should I look for.

    • profile image

      Aryan 3 years ago

      Excellent Article

    • profile image

      jayant 3 years ago

      This is nice information for layman to understand about inverted information. I wanted to purchase but was not having any knowledge about it. Thank that now i can confidently talk to the seller and search for good product..

    • profile image

      Ranadeb 3 years ago

      Excellent information for the newcomer's who want to purchase for domestic purpose.

    • profile image

      Harish Thapar 3 years ago

      Excellent Article with clear content

    • profile image

      sukhpal singh 3 years ago

      This is very usefully 3 simple steps

    • profile image

      M N RAO 3 years ago

      Informative. Useful for the domestic potential customers.

    • profile image

      vijay 3 years ago

      very useful article thanks

      how to share it on facebook

    • profile image

      RAVIKIRON 3 years ago

      I have a unit with 875 VA and 150 AH battery. Can I connect one more battery for extended back up. nayak.ravikiron@rediffmail.com

    • profile image

      Gowrabathuni Chaitanya kumar 3 years ago

      Thanks for Motivate me. The information really helpful for every buyer. once again really thanks.

    • profile image

      Sakib Mollah 3 years ago

      thanks a lot to give a clear idea for inverters..

    • profile image

      Imran 3 years ago

      thanks a lot !!! article was really helpful

    • profile image

      dattatreya 3 years ago

      Thanks setu, for ur comment. it is really nice .

    • profile image

      gaganklair 3 years ago

      thanks sir.it is very use full information

    • profile image

      kumar 3 years ago

      good one

    • profile image

      k.soma sekhar 3 years ago

      thank u for valuable information

    • profile image

      Subrahmanyam 3 years ago

      Nice article, Good Explanation.

    • profile image

      Pavan 3 years ago

      Nice one...Thanks..helped me a lot

    • profile image

      binod 3 years ago

      Thankyou!

    • profile image

      Pawan Rampuria 3 years ago

      Very Useful info., thanks :)

    • profile image

      balu 3 years ago

      excellent info.....

    • profile image

      adi 3 years ago

      very good artcle for normal person.

    • profile image

      Vinay N Bhagwat 3 years ago

      Excellent information and very useful.Thanks a lot for valuable guidance.

    • profile image

      Vinay 3 years ago

      Excellent information and very useful.Thanks a lot for such valuable guidance.

    • profile image

      Babu 3 years ago

      Very useful Information Brother. Thank you Very Much

    • profile image

      CHAPPIDI SRI VENKATA BHIAMA PRASAD 3 years ago

      Useful information.Thanks.

    • profile image

      A.R.Mahendran 3 years ago

      very useful article

    • profile image

      Girish 3 years ago

      Wonderful article...thanks a lot...

    • profile image

      B M KUMAR 3 years ago

      thanx dear, its too useful article. you explained so easy to calculate the capacity.Excellent article Kesu....thanks a lot.

    • profile image

      madhu 3 years ago

      Thank you so much bro...it really was so much helpful for me.....

    • profile image

      Anand 3 years ago

      Thank you for a very, very, very, very useful article.

    • profile image

      Chaitanya 3 years ago

      Helpful

    • profile image

      GANESAN 3 years ago

      I'M VERY HAPPY ....VERY CLEAR ANS HELP FULL THANK YOU.....

    • profile image

      Jacob John 3 years ago

      Simple essay with good narration keeping layman in mind . Thanks

    • profile image

      ChadeArreve 3 years ago

      As a Newbie, I am permanently browsing online for articles that can help me. Thank you

      ElubsJemaJale

    • profile image

      julien 3 years ago

      the only thing the article doesn't say is that the battery will not last a month. you can not discharge more then 50%...if more the life of the battery is very short.

      i have 1392ah batteries(48 *232A*6Vdc)

    • profile image

      Dharma Reddy 3 years ago

      Great work by you setuji.dont know where r u from..but i liked ur article.it is crystal clear.Hope God blessing will be with you and ur family.

      gmail id

      cool.dude.dharma

    • profile image

      Prasad 3 years ago

      Good One....very helpful....

    • profile image

      Alif Khan 3 years ago

      This is very useful article. Thanks

    • profile image

      alok 3 years ago

      very good article

    • profile image

      sanjay 3 years ago

      excellent!

      you have done a very nice job.

      very interesting and useful to the budding engineers.............

    • profile image

      CapitalP 3 years ago

      Three years after, your explanation is still educating and enlightening.

      Thank you, i learned a lot.

    • profile image

      G.P. Rama Rao 4 years ago

      I never expected such explanations. I was in black position about inverter, and your explanation achieved to get correct and suitable inverter for my house. Thank a lot

    • profile image

      kamal 4 years ago

      excellent article