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  • Home power inverter is to provide uninterrupted power to run household electric devices. These inverters for home are available in different voltage and load capacities. In the basic design of the home inverter a DC (battery) source is connected to a transformer through the center tap of the primary winding. A switch is rapidly switched back and forth to allow current to flow back to the battery following two alternate paths through one end of the primary winding and then the other.

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    The alternation of the direction of current in the primary winding of the transformer produces alternating current (AC) in the secondary circuit. This will be 230 /110 Volt AC and can operate all the electric devices.

    Efficiency of the Power Inverter for Home

    The quality of the output wave form (230 volt AC) from the inverter determines its efficiency. The quality of the inverter output wave form is expressed using Fourier analysis data to calculate the ‘Total Harmonic Distortion’ (THD). THD is the square root of the sum of the squares of the harmonic voltage divided by the fundamental voltage.

    THD = √ V2 2 + V3 2 + V4 2…………. Vn 2 / V1

    Types of Power Inverters

    Based on the output waveforms, there are three types of Inverters. These are Sine wave, Modified Sine wave and Square wave inverters.

    Sine wave power inverter

    Sine Wave Power InverterAlternating current has continuously varying voltage, which swings from positive to negative. This has an advantage in power transmission over long distance. Power from the Grid is carefully regulated to get a pure sine wave and also the sine wave radiate the least amount of radio power during long distance transmission. But it is expensive to generate sine wave in an inverter. Its quality is excellent and almost all electrical and electronic appliances work well in sine wave inverter.

    The sine wave is the AC waveform we get from the domestic lines and from the generator. The major advantage of sine wave inverter is that all of the house hold appliances are designed to operate in sine wave AC. Another advantage is that the sine wave is a form of soft temporal rise voltage and it lacks harmonic oscillations which can cause unwanted counter forces on engines, interference on radio equipments and surge current on condensers.

    Modified Sine wave or Quasi Sine wave

    Modified sine wave is designed to simulate a sine wave since the generation of sine wave is expensive. This waveform consists of a Flat Plateau of positive voltage, dropping abruptly to zero for a short period, then dropping again to a flat plateau of negative voltage. It then go back to zero again and returning to positive. This short pause at zero volts gives more power to 50 Hz fundamental frequency of AC than the simple square wave.

    Inverters providing modified sine wave can adequately power most house hold appliances. It is more economical but may present certain problems with appliances like microwave ovens, laser printers, digital clocks and some music systems. 99% of appliances run happily in modified sine wave. Instruments using SCR (Silicon Controlled Rectifier) in the power supply section behave badly with modified sine wave. The SCR will consider the sharp corners of the sine wave as trashes and shut off the instrument. Many of the Laser printers behave like this and fail to work in inverters and UPS providing modified sine wave power. Most variable speed fans buzz when used in modified sine wave inverters.

    Square Wave Power Inverter

    square wave power inverterThis is the simplest form of output wave available in the cheapest form of inverters. They can run simple appliances without problems but not much else.Square wave voltage can be easily generated using a simple oscillator. With the help of a transformer, the generated square wave voltage can be transformed into a value of 230 volt AC or higher.

    Terms related to Inverter

    Watt (W)

    Watt is the measure of how much power a device uses when turned on or can supply. If a device uses 100 watts, it is simply the voltage times the ampere (rate of current).If the device takes 10 Amps at 12 Volt DC, it uses 120 watts power. That is 10A x 12 V = 120 W.

    Watt Hour (WH)

    A watt hour (or Kilo Watt hour – kWh) is simply how many watt times, how many hours the device is used. If the device uses 100 watts for 10 hours, it is 1000 watt hour or 1 kWh. The electricity tariff is based on kWh.

    Ampere (A)

    It is the measure of electrical current at the moment. Amps are important to determine the wire size for connecting the inverter to the battery. Low gauge wire will heat up and burn if heavy current flows through it from the battery.

    Ampere Hour (Ah)
    Amp-Hour usually abbreviated as Ah is the Amps x Time. Ah is the measure of battery capacity which determines the backup time of the inverter

    Volt Ampere (VA)

    It represents the maximum load capacity of the inverter. Commonly available inverters are 500 A, 800 VA, 1000 VA, 1500 VA etc.

    Power in Inverter

    Peak power and Typical or Average power
    An inverter needs Peak or Surge power and Typical or Average (Usual) power. Peak power is the maximum power that an inverter can supply usually for short time.Some heavy current appliances like motor and refrigerator requires a startup peak power than they require when running. Typical power is the power that the inverter gives on a steady basis. This is usually much lower than the peak power. Typical power is useful in estimating the battery capacity. Therefore inverters must be’ sized’ for the maximum peak load and typical continuous power.

    Power Rating of Inverter

    Inverters are available in different ‘Size ratings’ from 50 VA up to 50000 VA. Inverters larger than 11000 VA are seldom used in household applications. The first thing you have to consider about the inverter system is its maximum peak power or surge power and steady current supply. The surge rating is usually specified at so many watts for so many seconds. This means that the inverter will handle an over load of that many watts for a short time. This ‘surge capacity’ will vary considerably between inverters and even with in the same brand. Generally 3-15 seconds surge rating is enough to cover 99% of appliances. Inverters with lowest surge rating are the high speed electronic switching types.

    Current consumption

    Depends on the wattage of the appliances used, current consumption of the inverter can be calculated using the formula

    I = W / V Where I is the current in amps, W is the wattage of the appliance and V the 12volt (battery voltage).


    Wattage of an instrument is calculated using the formula

    W = V X I Where V is the 230 volt AC and I is the current consumption.
    Watt rating is usually printed on the back side of the appliance near the power cord.

    It indicates the ‘Size’ (capacity) of the inverter. To select the inverter size, the given formula is useful

    VA = W x Inverter loss. Inverter loss is typical around 1.15. If the total load connected to the inverter is 400 watts then the minimum inverter size should be 400 x 1.15. That is 460 VA. A 500 VA is suitable for the load.

    Ampere Hour (Ah)

    The capacity of the battery is represented in Ah. It is the amount of current a battery can give during one hour of charge / discharge cycle. High capacity batteries (100 Ah, 150 Ah) are used to power inverters to get sufficient backup time. The formula to select the battery power (Ah) is Load in watts / Voltage of battery x Backup hour.

    For example if you wants to run 400 watts load on 12 volt battery for 3 hours, then the capacity of the battery should be minimum 100 Ah.
    Ah = 400 / 12 x 3 = 100 Ah. If the load increases (within the capacity of the inverter), backup time reduces.

    Selecting the Best Home Power Inverter

    Before selecting the inverter, it important to calculate the total power consumption of the appliances that are going to be connected to the inverter.

    It is important to note that the power consumption (Current drain) increases when the driving voltage decreases. When the input voltage drops in the domestic supply lines from 230 V AC to 200 VAC, electric devices will consume more current. For example a load rated 300 Watts (like Fridge) operating in 230 volts uses 1.4 Amps in one hour. The same load takes 1.5 Amps if the line voltage drops to 200 volt during peak hours (6pm- 9 pm). So it is advisable to switch off high current devices during peak hours. This conserves energy as well as reduces the electricity bill. If heavy loads are running in inverter, battery voltage diminishes from 13.5 volts to 12 volts with in a short time. This reduces the backup time. So it is better to connect only light loads such as fan, lights and TV to inverter lines.

    Current Consumption in Home appliances

    The table given below shows the power rating of common home appliances.

    Power Calculation

    Before purchasing an Inverter, it is necessary to calculate the power requirements of the loads that are going to be connected. Mid size inverter (500VA to 800 VA) will handle most of the low power household appliances.

    If you wish to use 2 Fans, 2 Tube lights and 1 TV, the total power consumption will be around 380 Watts. Power loss in the inverter is estimated as 1.15. So the Inverter capacity should be at least 380×1.15. That is 437 VA. The suitable available size is 500 VA. Inverter rating is usually given in VA (Volt Ampere). The backup time of the inverter depends on the type and capacity of the battery used. Battery capacity is represented in Ah (Ampere hour). To power the whole house (say 3000 watts), more planning is necessary. A 5 KVA inverter is necessary in this case. But obviously not every appliance will be ‘ON’ at the same time. So a high capacity inverter is a good choice because, if the load increases above the rated capacity of the inverter, it can lead to hazardous results.
    If a 24 Volt inverter with 24 volt battery is used, backup time can be doubled. But the cost of the inverter and battery will be high compared to a 12 volt inverter and 12 volt battery.

    Power loss in Inverter and Current consumption during charging.

    No power inverter can function efficiently. The working of the inverter depends on many factors like conducted load, battery efficiency and maintenance. During operation, inverter will heat up and the transformer will dissipate heat. So some energy will be lost which reduces the efficiency. Proper charging of the battery and its efficiency to hold charge are two very important aspects. Input voltage from the AC lines should be close to 230 volts for proper charging of the battery. Fully charged battery will show 13.8 volts. Inverter should switch on charging immediately when the battery voltage reduces to 12 volts. Charging current depends on the time taken to complete the charging process and also the ‘charge condition’ of the battery. If the battery is discharged to 80% of its efficiency, it will take 5 to 7 Ampere current for charging during the first few hours. Then the current reduces to 500 milli amperes or less. A fully charged battery will not take any current. Most inverters have two mode charging-Boosts charging and Trickle charging. During boost charging, around 5 to 7 ampere current will utilized and during trickle charging only 25 to 50 milli ampere current will be utilized.

    attentionThe author D Mohankumar is not an active member anymore. Please take into consideration that the presented information might not be correct.
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    118 Responses to "Power Inverter for Home"

    1. Sivanand says: on April 26, 2010 at 8:37 am

      Whats Current consumption in hours (in Amps mean) ?
      Normally power is rated as Watt hour units or Kilo Watt Hour Units.

      • deepen says: on July 4, 2012 at 9:41 am

        Generally, Ampere-hour is used in specifying batteries, as they have constant voltage output. But when there is a chance of variation in input voltage, we use Watt-hour or KWh. P=VI, so when voltage varies current consumption by appliances also varies, but the total wattage or P remains same.

      • pradeep panja says: on June 2, 2015 at 3:59 pm

        Dear Sir.Amplifire Transformer-24-0-24/4.5Amp,Transformer Price,Thanks,
        Revendr Electronic Pvt.Ltd,Kolkata,

      • I am buying invertor including for 15 fans and 25 cfl’s

    2. sir where is the circuit diagram i want it

    3. Sir, your way of defining is really impressive.Is it possible for you to explain how to choose Transformer size for diffrent capacity Inverters.


      • Sir, your way of defining is really impressive.Is it possible for you to explain how to choose Transformer size for diffrent capacity Inverters.

    4. D Mohankumar D.Mohankumar says: on May 1, 2010 at 5:34 am

      Definitely . I am trying to write articles in simple form so that everybody can conceive the concept

    5. Deven says: on May 3, 2010 at 7:15 am

      The article is really impressive. I’m very thankful with you.

      I’m planning to make an inverter as my final year project for B.E. Could you write some reference books title?

    6. D Mohankumar D.Mohankumar says: on May 3, 2010 at 2:11 pm

      I will publish a post soon related to Inverter making.You may search in Google using the key words – inverter types/design.You will get enough materials. Books are also available in shops

    7. can any one help me out in plotting a circuit diagram ,to measure the output of simple inverter using cro and multimeter\tong tester

    8. Adenle Debo says: on June 28, 2010 at 3:51 pm

      Thank u very much for all your advice,pls can you help me out with 500va inverter design calculations?

    9. Sir, could you write about PWM inverter in such impressive way. I would be very thankful to you. I’ve scanned a number books related to power electronics but could not understand till date. I’m very hungry to know the principle.

    10. D Mohankumar D.Mohankumar says: on July 6, 2010 at 8:00 pm

      I will try my best to post an Article related to PWM Inverter

    11. thank you sir for providing so much information…… this was really great…..
      but sir, i wanted to know that if my inverter of 650va supply 60% to 70% of its total charging everyday then how much electricity is it consuming everyday…….
      kindly provide the knowledge…………
      thanks a lot….

      • D Mohankumar D.Mohankumar says: on October 24, 2010 at 8:18 am

        If a charge cut off facility is in the Inverter, current consumption from AC supply depends on the duration of charging.Tubular battery or Lead Acid battery takes current depending on many factors like age, water level, specific gravity of acid, plates condition etc. If the battery is good, it will consume less than 1 Amps during initial stage and drops 500 ma or less during the remaining period.As a rule a good battery consumes very little current and approximate cost per day is Rs.1.This is the case of a charger with cutoff rage between 11.5 – 14 volts.If battery voltage drops to 11.5 volts, to attain full charge to 14 volts, maximum time will be 20-30 minutes depending on the condition of battery.

    12. this article is so helpful. thank you sir,
      when will we get a article about inverter transformer from u??
      i have an Inverter at my home, its 1000VA with 12v 200Ah Lead acid battery.
      i want how much should be the appropriate charging current & voltage for it???

    13. sir, i want to make a project which is eco friendly ie, it uses eco friendly material which consumes power in millimaperes and gives out a large output. And i want it to be in such a manner that it can be used in daily life with less effort. sir plz kindly rply

      • D Mohankumar D.Mohankumar says: on November 17, 2010 at 5:33 pm

        Eco friendly, you mean power generation using wind or solar energy.Mention the use of the circuit and concept.What will be the materials to be used . What is the output. Current or driving a load.Give details.

      • Dear Sir,

        Your article is very informative and easy to understand.

        Can you please let me know if a square wave inverter can damage fan regulators and / or tubelight chokes as we have changed at least 4 regulators and 3 chokes after we fitted a square wave inverter.

        The output voltage from the inverter is ranging from 265 to 280 Volts when there is a power cut.

        Your early reply would be highly appreciated.

      • i think there is a problem in your inverter… if the o/p voltage is 265 to 280v there is a chance to damage of appliances

    14. chennareddy says: on January 20, 2011 at 5:32 pm

      hello sir….
      am using a 12 volts 7ah battery for my UPS, can i use 40ah battery insted of 7ah.
      please help me……..
      send answer to my mail id.

      thank you

    15. Very informative article even for non-technical person who intend to purchase inverter.
      If I need a backup of 8-12 hours for my computer (one home PC with 15″ CRT monitor), what specifications of inverter and battery do I need.

      • D Mohankumar D.Mohankumar says: on January 29, 2011 at 3:47 pm

        Dear Saurabh
        Thanks for the feedback.The backup time depends on the total watts used. CRT based computers use 80-200 watts.500 vA inverter is sufficient for the purpose. But the battery Ah must be more than 150 Ah for this long duration back up.Use the formula given in the article to calculate the battery Ah. 200 W /12V x 12 hours = 200 Ah.150 Ah 12 volt battery can give 8 hours back up.

    16. I need a small Inverter for one fan & tubelight. Please tell me the rate of inverter.

    17. olawale says: on March 1, 2011 at 5:48 pm

      i am working on inverter as my as my assign project at emmanuel alayande college of education oyo state nigeria.

    18. dear sir,
      give me a suggestion to install a inverter in my home using 150 Ah exide battery & 600VA powerol UPS.give me a diagram of inverter that out put connected to the fan ,lights,etc…………..

    19. my inverter often stop charging during frequency fluctuation in the input current. this is especially noticeable and very bad when i am using generator to charge the inverters. as there is often power failure from the community main lines i have to result to generator often. but the generator fail to charge the battery of the inverter adequately due to frequency fluctuation? what can i do? any way i can steady the frequency from the generator? thank you.

    20. Engr.Baqer says: on April 30, 2011 at 2:51 pm

      Good work.
      Sir i have a 1KVA inverter and 12V 150Ah lead acid battery.I have been using this inverter for about an year.But the inverter has damaged 3 batteries since then,in the starting month or two the battery works well and gives me backup of almost 6 hours or more on a single ceiling fan and a 46 watts bulb.but then the battery starts heating up, after 3 or 4 months, while charging and the battery charge never goes to its full.consequently, the battery backup also reduces to an hour.I dont understand what is the problem with the inverter.Is there problem with the peak charging voltage of the battery and discharge voltage???if it is so,then kindly tell me at what voltage should the inverter stop charging the battery?and when should the inverter stop giving power(minimum voltage of the battery below which the battery must not be discharged).

    21. US GUPTA says: on June 6, 2011 at 3:29 pm

      The article is very interesting and informative. However my question is” Why the Tube Lights not work properly with UPS supply? If you connect a 250 mf condenser at UPS output the things work fine. Why it is so?

    22. sir….can u send a home inverter circuit to my mail…
      where can i get inverter circuit…
      because i’m doing this for my final year project…
      or else can u send to me the circuit…!!
      really need ur help….

    23. karsang Dorji says: on July 23, 2011 at 8:34 am

      Dear Sir,
      I would like to construct home inverter in Bhutan for remote home powering. Would you please suggest me with all necessary tools, equipments and circuit diagram along with the components ?

      Your help will be highly grateful


      karsang dorji

    24. Thanks for this very informative post

    25. sir i have 2 12v 42 Ah battery ..now i want to use both the cell for home inverter kindly help me to choose inverter & how can i connect for more backup

    26. Sir,
      I have calculated the total load as 700 Watt. the back up required is 6hrs. Pl tell me the specifications of both inverter and battery

    27. manoharan says: on October 12, 2011 at 9:45 am


    28. Thank you for this very very usefull information. …….. thank you very much!

    29. Kayode_richard says: on October 20, 2011 at 2:42 pm

      Sir,in ur article u mention about battery capacity of 100Ah that it take 3hour charged,sir its 3hour for all charger to charge this type of battery? & if its 150Ah battery what time will it take to complete charging?

    30. hi sir,

      i have two 100 watt bulbs.two silling fans, & one lcd tv.i want inverter for four back up.which inverter better for me..plz help me.mb 09004378879

    31. Dear Sir,

      I need an inverter to provide 4 hours of power back up to run my CRT desktop. Kindly, help me to know what combination of inverter and battery, should I buy for that purpose.

      Thanks & Kind Regards

    32. Gopinathan says: on November 12, 2011 at 10:03 am

      Dear Sir,

      How much electricity will be consumed for charging a 12V 100Ah battery unit?

    33. Padmanabham says: on November 12, 2011 at 12:19 pm


      Can I use 100 AH battery with an inverter of capacity of 1 k
      Is it harmful if the inverter rating is high and battery AH is low

    34. hello sie,
      your article is very impressive. my friends plan to do inverter project. this article is very useful for us.

    35. ron whorley says: on December 10, 2011 at 7:52 pm

      I need some help,in finishing our house off grid system.
      When I bought the Generac 7kv propane generator which I have installed, it came with a transfer switch which is designed to switch from hydro to generator when hydro (Grid pwr.) drops out.
      I thought I maybe able to hook up my solar,wind,battery power system through a 24vdc to 220v ac modified sine wave 5000 watt inverter which I have already bought. but when I received it it only had 2 wire output not the 220/110 split phase output?? it has 4 universal plugs for the 220vac output (only 2 wires hooked up) but they are parallelled up from 4 diff. cct boards.
      I am not familiar with the design but in the instructions it says it raises the 24vdc input to 300vdc then converts this using advanced MOSFET transistors in a full bridge configuration. It also says its capable to start and run difficult reactive loads.
      I am wondering if I bought a 220v to 220/110v split phase transformer and could I put that between the inverter and the transfer switch.
      I do not want to buy a transformer which will cost me around 300$ plus shipping just to blow every thing up??
      so hope you can shed some light on these things.

      • Ron Whorley says: on December 23, 2011 at 7:45 pm

        sir: can you give me any of your thoughts on any problems with adding a one to one 220v isolation transformer with the out put winding having a center tap (NEUTRAL) to provide a 110v split wave? other than parasitic losses and heat disapation.
        Regarding my problem of
        coverting 220v MSW 60 cycle 5000 watt inverter to 110/220v split wave output
        I bought the Generac 7kv propane generator which I have installed, it came with a transfer switch which is designed to switch from hydro to generator when 220/110vac plit phase hydro drops out.
        I thought I maybe able to hook up my solar,wind,battery power system through a 24vdc to 220v ac modified sine wave 5000 watt inverter which I have already bought. but when I received it it only had 2 wire output not the 220/110 split phase output?? is has 4 universal plugs for the 220vac output (only 2 wires hooked up to them) but they are parallelled up from 4 diff. cct boards.
        I am not familiar with the design but in the instructions it says it raises the 24vdc to 300vdc then converts this using advanced MOSFET transistors in a full bridge configuration. It also says its capable to start and run difficult reactive loads.
        I am wondering if I bought a 220v to 220/110v split phase transformer and put that between the inverter and the transfer switch.
        I do not want to buy a transformer which will cost me around 300$ plus shipping just to blow everything up??
        Any body had any experience with this type problem I would appreciate any help I can get.
        Regards Ron

    36. Dear Sir ,

      currently in my home 900 va Inverter is installed , My computer is loaded with 600 watt power supply (not in max load currently) i like to install a graphic card which requires 180watt power supply,

      want to will my home inverter take load when , graphic card is installed , apart from that 4 CFL of approx 70 watt will running .. kindly help me to solve the issue..

    37. Mohan Sir,

      I am new to Inverter and don’t have any basic knowledge on Inverter and batteries.

      I am planning to buy a new Inverter & Battery for my house. We have a regular power cut for 4hours(morning 2hrs & afternoon 2hrs) daily. My consumption as below.

      a) 2 Regular Tube light,
      b) 2 (3 leaf) ceiling Fan,
      c) TV/Computer(24inch LCD display and CPU i7)
      d) BSNL modem (for Internet)

      I inquired few inverter dealers in hyderabad, they suggested to go with 850KV Inverter(APC) and 130ah Tubler Battery.

      My questions as below :
      1. Will the above configuration (850KV & 130AH battery) solve my requirement ?

      2. Will my electricity Bill increase ? now i am paying 400/month. if increase how much per month avg. ?

      3. On power trip, will there be any problem to my computer & modem ?

      4. Any solution for my problem in Solar energy ?

      I request you to please answer my above questions..


    38. sir,
      please give information of inverter for fridge 200 w which capacity will require

    39. Sankar TL says: on February 5, 2012 at 2:28 am

      Dear Sir,
      Can a inverter connection charge be Rs.7500?!!. My relatives booked two 2 BHK flats here in Chennai, which is under consn.. The electrician says that he’ll do proper inverter connection only with Good qlty wires, & his way of inverter connection requires all 3 wires [Phase, N & E] connected to sw boxes & inverter etc.., He says this is d proper method, so it’ll cost Rs.7500. AFAIK abt Rs.1000 labour + Rs.500 material is charged in many places. I’ll be grateful if any of u clarify whether he is genuine or geniunely cheating. Pls REPLY, Thanks 4 reading.

    40. sir can you help me…….. i want mini project am ECE student.

    41. sir can you help me…….. i want mini project in power consume am ECE student.

    42. pls help this project..Design an eco-friendly power generator that is driven by wind energy and solar energy. Their generated electric powers are stored in a battery for further application.

    43. Sunny Ghag says: on March 1, 2012 at 5:55 pm

      Hi Sir,

      I did red your article, but was not able to calculate the inverter capacity/requirement for myself.
      Im starting a computer institute & want to know that if i have to run 6 desktops, 1 server, 8 fans & 8 CFL,s
      Also want to know that which inverter will be reliable & good.


    44. Hello sir,
      The article was very informative.
      I am a newbie to the world of invertors so it would be great if you can help me with my question.
      I am planing to buy 1000W invertor to be connected to 3 fans, 2 tubelights. How much duration will the invertor work if all of these are running?
      Awaiting your reply.

    45. impressiv,
      can u give no.turns,gage of wire and core size 500va inverter

    46. Hi Sir
      Thank for ya update…..it is helping me in my final year project.

      QUESTION: The battery for powering inverter is limited in usage …it discharge and charged again and again…

      supposing i have an 60watt AC adapter (output 12v DC ),i plug it and directly use it to power my inverter and i now load the inverter with a 300watts load……

      the question is if this configuration is right…..will i be charge for the wattage consumption of the ac adapter or my 300watts load on the inverter..

    47. Hi, i need a inverter which support 4 hrs backup for 2 fans, TV & two 20 watts CFL lights.. Please suggest me the right product.

    48. Dear Sir

      Kindly mail me your mobile no. I wish to speak to you for some clarifications.

    49. J. N. Ravichandran says: on March 30, 2012 at 9:06 am

      I intend to install an inverter in my residence apartment in Chennai. I will be staying here only one month in a year and the other 11 months the house will be locked up and we normally switch off the electric supply during this time.

      i am told that if not maintained regularly the battery will die and even if it is a non maint. battery the life is only for 2 years. Could you please offer me a solution for this problem.

    50. A.selvaraj says: on April 4, 2012 at 8:01 am


      shall i use 600va/7ah ups to celling fan it will come hour,please explain.

    51. wts fault occer in inverter of 500va
      plz reply fastly

    52. sir i am a B.E student.i want to creat a home inverter so i want UPS circuit and other detalis related to that.can u help me

    53. sivakumar says: on April 16, 2012 at 7:27 pm

      Dear sir,

      i am having 500 Va digital Invertor,

      at present i am using 40 AH battery but back up is very Low, so i want to change my battery,

      Please advice max AH battery which 500 VA will charge, i may use daily 4 hrs,


    54. Peter MacLachlan says: on April 22, 2012 at 9:23 am

      Power from the Battery….Will a 600watt inverter draw less battery power than a 1000watt inverter, even if the loads they are drawing are the same. Thanks for a great article.

    55. rupesh kumae says: on April 23, 2012 at 7:14 pm

      hi sir i like to import a solar inverter for a lest price witch will run about 2fan,2 tube lights,& 1 tv. plz help witch brand and where can i get it.

    56. santhosh says: on May 8, 2012 at 9:52 am

      Dear Sir, i am planning to purchase an inverter,my requirements are as follows, invert to be used for lights( CFL) , fans( including table fan)and Tv.and also to work in continous whenever the power fails.Can you please advice wat should be the inverter tecnical details ans also the best brand options so that i can purchase the right one


    57. Sherli.N.k says: on May 20, 2012 at 6:26 pm

      im planng to buy a inverter to support 5cflbulb, 4 fans& T V which brand is the best one ,of how many watts& how much duration inverter workif these r running & howmuch willbe the cost?

    58. loganathan says: on May 25, 2012 at 4:02 pm

      Dear Sir
      pls provide details how to connect INVERTER to Home’s load(electrical swith board)

      1.how to connect output of INVERTER
      2.should we connect only phase to load
      3.shoud we use MCB to connect INVERTER to load

    59. s.pradha says: on June 10, 2012 at 2:21 pm

      any one will you please tell ,,does the inverter of 1500W capacity will consume more than 150 units per month???

    60. s.pradha says: on June 10, 2012 at 2:22 pm

      how much extra units will be consumed by an 1500w capacity inverter per month,,

    61. Ijeamuan terryson says: on June 17, 2012 at 5:56 pm

      Hi…i do love science stuff very much that’s why am concerne about this website…am planning on how to make an inverter but i have no ideal on how to do it…i would b glad if you can assist me…with diagram and any other information…please i wouldn’t mind if a email is sent to me…

    62. Ijeamuan terryson says: on June 17, 2012 at 8:24 pm

      Sir…i sent you a message earlier today..am not that good with electrical terms,but i normally read to find out.i would like to create a house hold inverter..sir i need your help and advice..it’s a project to me..please i will be grateful if you reply…thanks again for this awesome site

    63. Ijeamuan terryson says: on June 18, 2012 at 5:13 pm

      Please sir…i would love the explaination of a home inverter that can charge it self…with a schematic 2 back it up….

    64. Ijeamuan terryson says: on June 18, 2012 at 5:13 pm

      Please sir…i would love the explaination of a home inverter that can charge it self…with a schematic 2 back it up….

    65. Dear sir, Your Article is very very informative, but i have one simple question I have a multipurpose table fan which is rated as 20-25watt and i am planning to buy a mini cfl inverter of 50w now can i run this 20-25w fan on that inverter… Inverter output is Ac and retailer said that i can lit 3*15w stranded cfls and one 5w cfl light at a time. so my ques. is can i run the 20-25w fan on that mini cfl inverter.

    66. Dear sir i hav Icsg3524 to complete my 1500watt inverter project plz sir how can i figure out maximum AWG for primary and secondary of the center tap transformer.. …becoz nigeria power electricity is generating 220v to each household..this icsg3524 will generate best PWM for my inverter plz help sir

    67. Hello sir this is kk from HYD Sir one small dug ht ihave an 300watt alfine company inverter than how many Amps battary i want to use

    68. Jim Keith Jim Keith says: on July 26, 2012 at 1:06 pm

      Hi KK, It depends upon the actual inverter load, rather than maximum load and the run-time before recharging. Per the information provided:

      “Ampere Hour (Ah)
      The capacity of the battery is represented in Ah. It is the amount of current a battery can give during one hour of charge / discharge cycle. High capacity batteries (100 Ah, 150 Ah) are used to power inverters to get sufficient backup time. The formula to select the battery power (Ah) is Load in watts / Voltage of battery x Backup hour.
      For example if you wants to run 400 watts load on 12 volt battery for 3 hours, then the capacity of the battery should be minimum 100 Ah.
      Ah = 400 / 12 x 3 = 100 Ah. If the load increases (within the capacity of the inverter), backup time reduces.”

      Additional information:
      Also consider the inverter idle losses or fixed losses when no load is connected–for instance, a 100W inverter idles at a lower current than a 300W inverter. This will discharge the battery with no load connected.

      Regarding battery capacity selection, the information provided does not cover depth of discharge–for reasonable of recharge cycles, the lead-acid battery must not be discharged below about 50% capacity (except for emergency). This automatically doubles battery capacity requirements. If charging via solar, rainy /overcast days must be considered to provide power during this period. For practical purposes, a very large battery is required for continuous operation. Generally avoid automotive batteries as they are not designed for many deep discharge cycles.

    69. sylva ilavbare says: on July 27, 2012 at 2:27 pm

      i have an appliances like 2 TV set, 3 bulb 3 ceiling fans, decoder. what voltage of inverter and the numbers of batteries i need sir.

      • Jim Keith Jim Keith says: on July 27, 2012 at 3:09 pm

        To power all items at the same time, you will need a 1000W inverter and two 100A-H 12V deep discharge batteries connected in parallel. The charging of the batteries (if solar) will be a major issue.

        Since this will be expensive, experiment with a 140 to 200W inverter and an automotive 12V battery–this will help you to learn the practicality and “nuts & bolts” of inverter power systems.

    70. Thank you author for giving basic information regarding inverter and battery selection topics….

    71. Rajan Nair says: on October 1, 2012 at 8:17 am

      I have installed a V-Guard inverter in my house in Pune. I notice that my monthly electrical bill has gone up by at least 25% (over and above the usual tariff hike). Could the inverter be causing this cost/consumption increase?
      Thank you in advance

    72. i want to charge a lead acid battery with two source at a time like one from the grid and another can be a solar power can any one give me idea regarding this one

    73. i want to charge a lead acid battery with two source at same time like one from the grid and another can be a solar power can any one give me idea regarding this one

      • Jim Keith Jim Keith says: on October 19, 2012 at 1:09 pm

        This can be accomplished with two “isolation” rectifiers in series with each voltage source to prevent the voltage of one from appearing across the other. One source being your AC powered charger and the other your solar panel. The cathodes of each rectifier are then connected to your battery. Whichever voltage is higher is the one that will be actually supplying the current, or at lower voltages (battery discharged condition) both will add thus increasing the charging current.

      • thanks for your reply and can u explain the concept with a circuit diagram, i am new to the field

    74. sadic Abubakar Sadiq Ibrahim says: on September 29, 2013 at 11:19 am

      Dear Sir
      i am a student a i want to connect my on 400w inverter circuit in my project pls i nit assistance from you sir.

    75. It is an amazing information about home inverter. I came to know some important points (which have been not found in any other sites) about home inverter by reading this post. I have also seen some other tips about home inverter like selection of best home inverter, its working, advantages and battery information in a page: http://www.electronicshub.org/inverter-for-home/
      Interested candidates may visit that page to get some more information.

    76. hello sir,
      i have installed 650 VA inverter with 100AH battery.i wanna to know that can i connect one more 80 AH Battery with this inverter,
      and my second question is currently my 100AH battery charge with solar as well as grid for couple of hours in a day,
      is this will harm battery?

    77. wiring diagram to connect inverter with electic line

    78. the article is informative.. however, it would be great if someone can help me with below query.. I have 1500 VA sine wave inverter and two 150 Ah tubular batteries.. I want to know how much load (in watts) does this whole set up puts on an elctronic meter from electricity bill’s perspective in two situations : 1) when both the batteries are fully charged.. 2) when it takes 2 hours to completely charge the batteries.. Looking forward for the response.

    79. sir, how many batteries are proper to be connected to a 5kwa inverter?
      Also, how many kva inverter is suitable for a 4 bedrooms and two sitting rooms duplex?

    80. Isaac Johnson says: on February 14, 2014 at 10:17 pm

      please sir i need your advise. i constructed an inverter of 2kva though on a 12v battery with transformer winded on 12-0-12/230v. when i power the inverter, the output on no-load reads 265v. when i connect a 200watt bulb the output wil drop to 145v thereby the bulb goes dim. please is the transformer responsible and what should i do? please advice me as your urgent response will be appreciated.

    81. I would like to know, is it possible to have 1500 va sine wave inverter with one single 150 AH battery. su-kam service person suggested me with 2- batteries, i dont want the backup in much, so is it possible for me to have such way with single battery with 1.5k inverter. plz kindly reply.

    82. Kuberkoos Kuberkoos says: on March 7, 2014 at 10:12 am

      very good writeup, a graph of a sine, modified sine and a square wave would have been nice

    83. Bhuvanesh says: on March 11, 2014 at 12:39 pm

      Dear Sir,

      Please reply to this :
      If we leave the house with switching off the main electricity power cable and leave the inverter on, will the inverter or the battery gets damaged? If so, how to solve this problem when we are not home for say, six months.?


    84. 2 volt.100ah battery is connected to the inverter ,what will be the output?please give the calculating steps.

    85. Aonkar says: on May 8, 2014 at 12:21 pm


      Is it possible to find, during runtime of the inverter, depending upon the current load, the time for which the inverter will run?

      At what voltage below which if the battery goes, the inverter trips? Does it vary from inverter to inverter or is there a standard?

      If there is a standard, then I think we can see the discharge profile of battery and estimate for how long can the inverter go by looking at what voltage the battery has fallen. Could this be done?


    86. Sir,

      I have 100 Ah (12v) two batteries with me…
      I want to use them for the inverter for my home.
      my load will be — 2 fan, 1 tv, 4 lights, 1 laptop
      Pls guide me what rating inverter shall i buy to utilize the best of my two batteries.

    87. DHEERESH KUMAR KHARE says: on July 18, 2014 at 6:37 pm


      VERY NICE…….


    88. kalpesh says: on August 7, 2014 at 4:03 pm

      hello…sir i make 500w inverter so i confuse to output side how much ampere transformer use than make this 500w inverter .

    89. i have a 1.5 hp 220v aircondition,
      tv, laptop 2 light bulb. how many watt inverter can power these appliances?
      how many watt solar panel? how many amp battery to run them in 6-8 hours a day.

      01.inverter watt?
      02.battery amp?
      03.solar panel watt?

      please help

    90. Sir

      our indian solar panels able to withstand with lightning strike ,some manufacturers claim that their panels capable to survive ever after strikes,but in internet available information says strike damage pv ,which version is correct

      pl.guide me


    91. Hi,
      Your replies and inputs are highly informative.
      I have a 5KVA and a 3.5KVA inverter used to power different sections of my house. Each is have 8 and 4 200Ahr batteries respectively. What is the minimum rating of a generator set that I need to charge these inverters separately and also together?

    92. hello All
      my inverter indicates that it’s charged full, but when I turn it on to supply power to only my desktop computer, it’s starts beeping overload. but a day Earlier it powers my 2 television set, bulblight, plus my desktop computer.
      pls help, what could be wrong?

    93. I live in kolkata and am looking for electric inverter to buy for home use. Preferably, I need inverter that can power these appliances 40” flat TV, 2 latptops, 3 Energy saving bulbs and 1 DVD.
      Please any outlet to buy.

    94. Name *Juwon says: on June 23, 2015 at 4:08 am

      I have problem with my 500watt inverter, I used four irfp150 ( 12 in each ). The problem is that one side get up quickly and blow up the transistors. please I need your help to rectify the problem.

    95. Theophilus says: on September 4, 2015 at 10:37 pm

      Hello sir,
      I have 4 pairs of 12volts, 125watt polycrystalline solar panels and an inverter of 12volt 1.2kva with the intention of powering total loads of 450 wattage. I also had charge controller of 30 amperage, and was able to access sunshine for 8 hours here in southern Nigeria. what capacity of battery will I use to achieve this ?
      Thank you.

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