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

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.

## Comments

Thanks,very useful guide.please kip it up.

Thank u.

Thank you v much....

thank you its very useful for me. now iam cleared

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

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

Very helpful.

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

thanks

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

Very useful information.

Thanks

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

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

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

thanks a lot dear. you made my choice very clear

simple and straight forward.

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

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??

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

Thank you . It help me a lot

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

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

70 watt

It was brilliant KSETU.

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

Thanks a lot

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

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

Thanks. so easy. Well written

Nice article , Thx for sharing

It was very help full. Thank you verymuch

thanks... it's helpful :)

good article

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

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.

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

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

Thanks

very helpful..

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

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

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

Thanks Dude, very nice and detailed explanation.

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

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

Thank you

Rdugg

Thank you so much. Very help full article

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

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.

Very nice and simple to understand. Good job

Thanks for great and important information.

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

thank yo for sharing very useful update with Us

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

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

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

This is nice information, thank you....

Very useful information

Thanks...

Very useful thanks alot

Thnks... 4 ur well explanation...

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

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.

Excellent Article

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..

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

Excellent Article with clear content

This is very usefully 3 simple steps

Informative. Useful for the domestic potential customers.

very useful article thanks

how to share it on facebook

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

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

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

thanks a lot !!! article was really helpful

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

thanks sir.it is very use full information

good one

thank u for valuable information

Nice article, Good Explanation.

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

Thankyou!

Very Useful info., thanks :)

excellent info.....

very good artcle for normal person.

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

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

Very useful Information Brother. Thank you Very Much

Useful information.Thanks.

very useful article

Wonderful article...thanks a lot...

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

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

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

Helpful

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

Simple essay with good narration keeping layman in mind . Thanks

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

ElubsJemaJale

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)

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

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

This is very useful article. Thanks

very good article

excellent!

you have done a very nice job.

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

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

Thank you, i learned a lot.

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

excellent article

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