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Things to Keep in mind before buying an inverter

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Boiling summer is just few weeks ahead, scheduled and unscheduled power cuts are expected as usual. Inverters are one of the most demanded products of summer season. Are you planning to buy or upgrade your inverter in this season? Then instead of being trapped in the marketing gimmicks, understand some basic facts and do a little bit home work. Here some facts you must know before buying an inverter

inverterCalculate your power requirements

Before going to purchase an inverter- You have to make a rough estimation of your power requirements. remember- Inverter is not a Generator. Inverter has it’s own limitations. You can’t power and run your complete home with a normal inverter. If your power requirement is  more than 3000 VA, then an inverter alone can’t cater your demands effectively. No doubt a high power inverter can run your refrigerator and air conditioners, but how long?  Here your battery will not last more than few hours. Hence it it better to go for a home generator. However if you don’t want a single minute power downtime, then a power inverter – electric generator combination is a good option.

 Wattage rating of typical home appliances

Appliances  Power
Fan (Ceiling) 50-75 Watts
Fan (Table) 25-50 Watts
CFL 18 Watts 18 Watts
Computer (Desktop) 80- 150 Watts
Laptop 20- 75 Watts
LCD TV (32”) 150 Watts
Refrigerator 160 – 250 Watts
Tube Light (4 Feet) 40 Watts

Starting power and running power

Starting and running power requirement of all electric appliances are different. An 18 Watts CFL takes around 25 Watts power to start and after few seconds it stabilizes to 18 Watts. Some appliances like Refrigerator, Washing Machine etc take almost double power to start as compared to the normal running power. Hence before selecting an inverter you must calculate the starting power requirement also.

Difference between VA and Watts

Often people confuse with the difference between Watts and VA ratings of inverter or other home appliances. Manufacturers use both these terms according to their requirements to confuse and mislead the consumers. Power drawn by the equipment (Power using equipment like Bulb, Fridge, Washing Machines, ACs, Stabilizers etc.) and Power generated by the equipment (Generators, Inverters, UPS etc) can be expressed in Watts or VA (Volt Ampere). In general Power generating or stabilizing equipment manufacturers use the term VA to specify their ratings and power consuming products use Watts to specify their ratings. Here comes the difference. Power in Watts is the real power drawn or supplied by an equipment, this is the real value. VA is the apparent power (more theoretical)  which is obtained by multiplying the Voltage and Current drawn/supplied by an equipment. We can equate the VA and Watts ratings:

Power in Watts = Power in VA- Losses


Power in Watts = Power in VA x Efficiency of the equipment

The ratio of Power in Watts to Power in VA is termed as Power factor. Unfortunately manufacturers often don’t specify the power factor or efficiency in their products.

Let’s see an example. You are purchasing an inverter with 650 VA power ratings. This 650 VA indicates, it can supply 650 VA power under ideal situations( means efficiency of the inverter is 100%). If we take 80% as a typical efficiency figure, the said inverter can supply 80% of 650 = 520 Watts only. Now you can understand why inverter manufacturers only publish the VA rating on their products. If an inverter or UPS is coming without mentioning power factor, you must take a safe value of 0.6 (60%) as power factor while connecting appliances.

Inverter or Home UPS?

Nowadays we can see a new segment in inverter market- Home UPS. Functionally both inverter and UPS do the same job- Converting Direct Current from batter to Alternating Current which is  used as a backup power generating device in case of mains power failure. UPS as the name suggest provide Uninterrupted Power Supply to equipment. The equipment will not feel the switching delay from mains to UPS supply. Switching over time of a typical UPS is 3 to 5 Milli Seconds only. A standard inverter takes around 500 Milli seconds which is unacceptable for the electronics devices like computers, Modems, Routers, printers etc.

Home UPS is a combination of Inverter and UPS. Here the switching delay of inverter has been brought down to UPS standard. Hence you need not to go for a separate UPS for PCs and associated devices. One thing you must remember- UPSs are further classified in to three- Offline, Online and Line interactive. Home UPS are normally Offline only, hence they cannot replace your online UPS requirements to drive sophisticated devices.

Digital Inverter

What is digital in inverters? First generation inverters were using power transistors as switching devices and transistorized circuitry for  monitoring/controlling applications. That is an old story. Nowadays inverter technology has changed a lot. A complete transition from old square wave technology to Pure Sine wave technology with the help of advanced Digital Signal Processing (DSP) techniques. Micro controllers are extensively utilized for précised monitoring and controlling applications. Switching transistors are replaced with high efficient MOSFETs.


Batter- the vital part of inverter. Performance and life of an inverter is greatly depends upon battery. We can see several classifications of inverter batteries. Normally high power Lead Acid batteries are used to power inverters. Lead acid batteries are classified in to different types as per application, design, technology etc.

Battery Capacity

Capacity of a battery is expressed in terms of Ampere Hour (Ah). It indicates the rate of current a battery can supply for a given duration. If the capacity of a battery is 100 Ah, that battery can supply 100 Ampere current for 1 Hour or 1 Ampere Current for 100 Hrs, 2 Amps Current for 50 Hrs .Capacity of inverter batteries are generally 100 Ah, 150 Ah or 180 Ah.

Why automotive batteries are not suitable for inverters?

Lead acid batteries used for automotive purpose are termed as “High Cycle” lead acid batteries. These batteries are designed to provide high current for a very short duration (To start the vehicles). Automotive lead acid batteries are not designed to be regularly discharged by more than 25% of their rated capacity. Here the requirement of inverter is totally different. Inverter require “Deep Cycle” type batteries to provide continuous power which can be discharged at least 50% of their rated capacity. Some good deep cycle batteries can be discharged over 80% of their capacity. Deep Cycle batteries have specially designed thick plates to withstand frequent charging and discharging.

Maintenance Free batteries

Lead acid batteries require regular maintenance. You have to check the electrolyte level and require to be topped up on regular intervals. Moreover these batteries release poisonous gases during charging and discharging. If you don’t keep the batteries in a properly ventilated place, it can invite serious health problems. You have to keep the terminals of normal lead acid batteries corrosion free by applying petroleum jelly or grease regularly.

Maintenance free batteries are sealed lead acid batteries which do not require topping up or additional ventilation.

Disadvantages of Maintenance free batteries:

  • Cost of Maintenance free batteries are very high as compared with normal lead acid batteries.
  • Life- Life of maintenance free batteries are comparatively low. For example if a normal lead acid battery run for 3 years, you can expect 2 years from a maintenance free battery.
  • Scrap value- You will not get much more from a maintenance free battery as scrap.

If you like a fit and forget inverter system or your situations don’t permit you to do periodic maintenance of batteries then go for a maintenance free battery. Let me quote one example- My friend uses Maintenance free batteries in his home because his old aged mother is living alone and she don’t have enough knowledge on battery maintenance. In that situation maintenance free battery is a right choice.

Tubular batteries

This is the most popular segment of inverter batteries-Tubular batteries have several advantages compared to flat plate batteries.  More complex design increases the manufacture cost but the high electrical efficiency and extra long life make tubular batteries suitable for both domestic and industrial applications. A good maintained tubular battery can run unto 8 years or more. Tubular batteries comparatively require less maintenance. Cost of tubular batteries can go up to double of a normal flat plate battery, however if you have a high efficiency inverter then go for a tubular battery, you will not regret. Almost all popular battery  brands in India like Exide, Prestolite, Amaron etc have specially designed tubular batteries for inverters.

Batteries from Inverter manufacturers

We can see that almost all inverter manufacturers supplies battery along with inverter. I strongly suggest-don’t go for such batteries. This is a simple business technique, often they just market batteries on their brand name. As battery costs more than inverter, it is always better to go for a  reputed and trusted battery brand. I have personal experience with Exide and Prestolite tubular batteries. Exide Invatubular batteries run flawlessly upto 5 years.

Local made batteries

We can see a common trend- People often go for branded inverter and local battery combination. Local batteries costs around 60% of the cost of same rated tubular batteries. However I don’t recommend local batteries because of the following reasons:

  • Poor life: A well maintained local battery can run maximum up to 3 years.
  • Poor efficiency: Electrical efficiency of local batteries are very poor, which requires more time to charge.
  • Safety hazards: Lead acid batteries are very much prone to explosion if not maintained well. We have witnessed several battery explosion incidents. Poor quality of safety vent plugs, casings, impure lead and acids increase the chances of accidents.
  • More maintenance: We can see that local batteries require more maintenance because of poor efficiency.
Flat Plate Batteriesexide inverter battery Tubular Batteries
exide invatubular
Maintenance Free Batteries (Sealed lead acid)
exide smf
Battery Life Span Low (~ 3 Yrs) High(~ 5 Yrs) Medium (3 to 4 Yrs)
Maintenance High Medium Low
Cost Low High High
Safety Low Low High
Efficiency Low High Medium
Scrap Value High High Low

Warranty/Guarantee of Battery

First of all understand the difference between Warranty and Guarantee- Under the terms of Warranty you will get the maintenance and repair of items in free of cost but no replacement. A product under Guarantee will be get replaced in case of malfunctions. Normally we can see batteries are marketed under guarantee + warrantee combination , ie first few years Guarantee and after that warranty. Some brands offer even 48 months warranty. As battery is the costly and vital part of your inverter system, go for a brand which offer long term guarantee/warranty and after sales support.

Inverter output (Sine wave, Square wave, Stepped Sine wave)

inverter waveforms

Our commercial power supply is 50 Hz pure sine wave (see the figure). However most of the inverters don’t output pure sine wave. Old inverters generate 50Hz square wave or 50Hz modified Sine wave (Quasi Sine wave , Trapezoidal wave or Stepped Sine Wave). Then the question comes. This wave shape really matters? Yes it does.

All commercial instruments are designed to run on pure sine wave. Characteristics of such devices are greatly depend upon the input wave shape. A change in wave shape will affect the performance of the appliances. Appliances like Motors, refrigerators, Ovens etc will generate full power on pure sine wave input only. Distortion in the sine wave creates humming noise in transformers, and audio devices. Some instruments like light dimmers, few battery chargers, toasters etc require pure sine wave to work. Prolonged operation of appliances in Square or stepped waves will considerably affect the life of such equipment due to the generation of heat.

You may be noticed that  audio amplifiers, Televisions, Fluorescent lamps etc make noise on inverter power. This indicates that inverter output is not pure sine wave. Sine wave inverters are costly as compared to square wave and stepped sine wave inverters, however it is always advisable to go for a pure sine wave inverter for the safety and effective performance of your appliances.

Square Wave Stepped  Sine Wave Pure Sine Wave
Safety of Appliances Less Moderate High
Life of Appliances Less Moderate High
Battery Life Less Moderate High
Noise Level High Moderate Normal
Heat generation High Low Normal
Suitability for sophisticated appliances No Not recommended for prolonged use Yes

Inverter efficiency and No load power consumption

Efficiency of an inverter is proportional to the amount of power drawn. It can varies from 90% to 50% from full load to light load. Here the notable factor is that inverter efficiency is high on maximum load. Generally an inverter is in its most efficient capacity when being used at around 1/3 to 3/4 of it’s full rating.

Power Consumption of inverters

Inverters take mains power supply to  charge the batteries. If the charging section of an inverter is not energy efficient, it will waste electricity even after the battery is fully charged. This will inflate your electricity bill. It is very difficult to check this aspect in shop before purchasing an inverter. However you can test the same at your home. Switch off all appliances except the  mains supply to inverter, disconnect the battery and measure the power consumption for a specific period.

Battery backup duration

Here we have an equation to find the battery life on load

Time(in Hrs) = Battery Voltage (In volts) * Battery Capacity (in Ah)*efficiency of inverter

                                                                           Load (in VA)

Let us have a sample calculation

Battery voltage = 12 Volts

Battery Capacity = 150 Ah

Load = Two fluorescent lamps (40 Watts each) and one ceiling fan (75 Watts )= 155 Watts

Inverter efficiency = 80%= 0.8

Backup Time = 12 * 150*0.8/155= 9.29 Hrs (Approx)

Other features

Solar Panel input: In typical Indian situations even eight hours of continuous commercial power supply availability can not be assured. Hence many people use the most reliable and alternate non conventional power source- Solar energy. Nowadays inverters facilitates the usage of Solar Panels also. Those inverters are embedded with solar charging circuits and regulators.

LCD Status Indicators: Modern inverters come with LCD status indicators to display various status like Battery charge level, Load, Input/Output voltages, Battery life etc.

Voltage stabilizer , High/Low voltage cutoff : Normal inverters don’t stabilize the mains supply, means the commercial supply is routed directly to the appliances without monitoring. Some inverters comes with in built voltage stabilizer , which protects your appliances from voltage fluctuations.

Earth Leakage Protection: Earth leakage protector is a safety device used to protect users from electric shock and appliances from damage. Modern inverters come with in built earth leakage protection circuits, which continuously monitor earth leakage and cut off the supply to safeguard the users.

After Sales Support

We can’t give a blanket suggestion in favor of a particular brand or model. All electronics equipment are prone to damage, hence after sales support is always paramount which varies from place to place. As inverters are static devices, go for a dealer or brand who offers on site warranty repair and maintenance.

Read this Home Solar Inverter Buying Guide

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408 comments… add one

  • debadata rout

    I have 4fans 100 watts each,
    4 cfl 18 watts each, Led 20 watts.
    I need 7 to 8 hours back up. Please sugess me, which inverter & batery are good for me?

    • Avinash

      for your requirement you need
      850va inverter and
      12volts,300Ah Battery

  • Anand

    Good article.Thanks.

  • KMF

    Very good information.

  • jijo

    very good article about inverter and battery


    I have 100 ah battery please tell me which inverter to buy or capacity of ups or inverter .

  • Ashu

    Very very good article

  • swamidayananda

    i requir a inverter for 25 fans and 100 cfl of 20watt and battery to back up 4 hours

  • I have 4 fans of 100 watts each
    4 CFL of 18 watts each,
    1 Tube light of 20 watts.
    Total = 510 Watts
    I stay with my mom and she is 61. She will be alone in the home till 9 in the evening, till i am back from the office, so I need 6 hours back up. Please suggest me, which inverter & battery is good for my usage.


    I have 7 computers & one lazer printer
    I need 4 hours back up. Please sugest me, which inverter & batery are good for me? & i want no rebooting of computers.
    can i prefer home ups & batteries of EXIDE.
    plz. guide me urgently.

    Good article.Thanks.

    • You need a 5 KVA UPS to cater this load. It can cost you Rs 50,000/- to 70,000 as per brands and battery rating. You can also think about a 5 KVA diesel Genset for this load and backup requirement

  • dinesh soni

    What is the best battery for invertor to run one fan one tubelight and lcd tv

  • Anil

    I need inverter for my home plc suggest me.
    I have 4 CFL tube 20w
    1 tv 32″
    2 fan
    1 refrigerator
    1 laptop

  • sandeep

    I have 35w*6 mini tubs, 40w*3 tubs,2Ceiling fans ,27*2, 65w*2 please suggest me which inverter is suitable 4 me nd I need 4 hours minimum backup

  • Manjunath

    I need an ups to run 4 tubelights ,1 fan and 1 tv for more than 12 hours each day.. Please do suggest me that which is best to buy

  • Dr. Usha

    Which is best inverter runs one ceiling fan n one tube light?

  • Vijay

    Excellent Article! All terms and jargon very well explained. However was expecting little more info on online/offline/line interactive UPS but rest of all very well explained! Thanks again!

  • Mothi

    Sooper Good article.. Very Nice Explanation.. I was totaly dumb before i read this one .. Simple and Very well explained… Hats off..:-)

  • Superb tips for keep in mind before buying inverter batteries. But here i suggest to everyone who looking to shop batteries online go to BatteryBhai.com and get all details and genuine products. No need to hassle just enjoy best class services offered by BatteryBhai.

  • Excellent Article on buying a Home Inverter.

  • Anil

    Very good and informative article , Thanks
    Keep updating

  • Excellent Article! All terms and jargon very well explained.

  • shivam lute

    Your information is good but, I need information about su-kam 5KVA ups 180V DC having Exide 65 AH-FIPO-IP 650 Invaplus batteries quantity 15 so what its back up period.

  • Kirtivas

    Very Good article.. Just a small correction I felt should be done.. While calculating the backup time it should be either of the following
    1. Backup Time = Battery Voltage (V) * Battery Capacity (Ah) / Load in VA
    2. Backup time = Battery Voltage (V) * Battery Capacity (Ah) * Efficiency of inverter (%) / Load in W

  • Narayanan

    I have 2 ceiling fans(100 watts), 2 tube lights(40 watts), 5 CFL bulbs(22watts). I need backup of 6 hours. Please suggest me, which inverter & batery are good for me?

  • Sunita shome

    I have 3 fans, 3 tube lights, 4 led bulb, 1 television 27 inch and 1 refrigerator, 1 audio system to run. I need a back upto 12 hours

  • Avis

    Awesome & useful information

  • Sreenivasulu G

    Great Article. Thanks for explaining the details clearly.

  • Gabriel

    article was very useful thankyou

  • Ghamdan

    Thank u,
    One question,
    Does the UPS(luminous) consume battery power when its switched off (when no output,no input).

  • Ramkumar

    I have 3 CFL lights, 2 fans and one sony LED TV. Please suggest how much capacity inverter i should buy.

  • RagS

    I have 2 to 3 fans, 4 to 5 CFL blubs , 1 LCD TV, 1 prtable tube tv, 1 Desktop & i need back for 7 to 8 hours of back up, which inverter & batery are the best for me?

  • ujjwal pareek

    we have running 8 computers and 4 fans 8 lights in our office which invert-or and battery is best for us

  • Sunil kumar

    i have buy luminus battery 155 Ah with inverter 1425/12 .is this good running or nt

  • Mohit Pandey

    I have 2 fans 70 watts each,
    2 tube light 35 watts each, Led 20 watts.
    I need 7 to 8 hours back up. Please suggest me, which invert-er & battery are good for me?

  • prasanth.

    pls suggest.
    i wnt 1 hr minimum back up. currently hav ups. that is useless.
    i want to operate 1fan,1light,1computer. what should i buy.which co. battery ??

  • gursharan singh walia

    I need inverter to run 4 tubelight 4 fans 2 tvs one plug point for laptop

  • Excellent Article! technical terms & jargons very well explained clearly… its really a eye opening for most of us… u might have also explained which batteries has pure sine wave technologies for our easy reference.

  • Rajesh P

    Very informative. Thanks buddy.

  • Roshan

    Extremely useful article. Precisely the information one would need before buying an inverter /Ups.

  • Awesome. All the details required for purchase of home ups is neatly explained.

  • Kavita

    Nice article. Can you give a general formula that can be used to find the battery and/or inverter specifications, given the total number of appliances and their respective wattages and assuming power factor=0.8, and battery of 12V type.
    Also, I would appreciate if you can give a relative comparison of the leading brand batteries performance and reliability.

  • ramureddy

    Sir i want to buy inverter which one is best and my requirment is
    1 Fan=100w
    2CFL bulps=20*2=40W
    1 Tube=40W
    1 usha table fan=55w
    which one invetor take and how much capacity reqiured and how much cost it will available
    total is 230w
    i want 5 hours backup
    i think 230*5=1150w plz sugges to me

  • eknath

    i want to purchage a invetar for 6 hr electricity

  • Narasimha

    Very informative. Thank you !!

  • Rishabh

    What is the average capacity of an inverter battery in watts… plzzz tell… its urgent…

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