How to Make a Solar Inverter Circuit

Solar power is abundantly available to us and is free to use, moreover it’s an unlimited, unending natural source of energy, easily accessible to all of us. We have discussed how to use solar panels for generating electricity from solar or sun power, in this article we are going to discuss a simple arrangement which will enable us to use solar energy for operating our household appliances.

A solar panel is able to convert sun rays into direct current at lower potential levels. For example a solar panel may be specified for delivering 36 volts at 8 amps under optimal conditions, but we cannot use this magnitude of power for operating our domestic appliances, because these appliances can work only at mains potentials or at voltages in the ranges of 120 to 230 V. Further more the current should be an AC and not DC as normally received from a solar panel.

We have come across a number of inverter circuits posted in this blog and we have studied how they work.

Inverters are used for converting and stepping up low voltage battery power to high voltage AC mains levels.

Therefore inverters can be effectively used for converting the DC from a solar panel into mains outputs that would suitably power our domestic equipment.

Basically in inverters, the conversion from a low potential to a stepped up high mains level becomes feasible because of the high current that’s normally available from the DC inputs such as a battery or a solar panel. The overall wattage remains the same.

For example if we supply an input of 36 volts @ 8 amps to an inverter and get an output of 220 V @ 1.2 Amps would mean that we just modified an input power of 36 × 8 = 288 watts into 220 × 1.2 = 264 watts. Therefore we can see that it’s no magic, just modifications of the respective parameters.

If the solar panel is able to generate enough current and voltage, its output may be used for directly operating an inverter and the connected household appliances and also simultaneously for charging a battery. The charged battery may be used for powering the loads via the inverter, during night times when solar energy is not present.

However if the solar panel is smaller in size and unable to generate sufficient power, it may be used just for charging the battery, and becomes useful for operating the inverter only after sunset.

Referring to the circuit diagram, we are able to witness a simple set up using a solar panel, an inverter and a battery. The three units are connected through a solar regulator circuit that distributes the power to the respective units after appropriate regulations of the received power from the solar panel.

Assuming the voltage to be 36 and the current to be 10 amps from the solar panel, the inverter is selected with an input operating voltage of 24 volts @ 6 amps, providing a total power of about 120 watts.

A fraction of the solar panels amp which amounts to about 3 amps is spared for charging a battery, intended to be used after sunset.

We also assume that the solar panel is mounted over a solar tracker so that it is able to deliver the specified requirements as long as the sun is visible over the skies.

The input power of 36 volts is applied to the input of a regulator which trims it down to 24 volts.

The load connected to the output of the inverter is selected such that it does not force the inverter more than 6 amps from the solar panel. From the remaining 4 amps, 2 amps is supplied to the battery for charging it.

The remaining 2 amps are not used for the sake of maintaining better efficiency of the whole system.

The circuits are all those which have been already discussed in my blogs, we can see how these are intelligently configured to each other for implementing the required operations.

A MINI solar inverter circuit with relay changeover is discussed HERE





For Charging Batteries up to 250 AH

The charger section in the above circuit may be suitably upgraded for enabling the charging of high current batteries in the order of 100 AH to 250 AH.

An outboard transistor TIP36 is appropriately integrated across the IC 338 for facilitating the required high current charging.

The emitter resistor of TIP36 must be calculated appropriately otherwise the transistor might just blow off, do it by trial and error method, start with 1 ohm initially, then gradually go on reducing it until the required amount of current becomes achievable at the output.




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275 comments

comments «Oldest   ‹Older   1 – 200 of 275   Newer›   Newest»
July 27, 2012 at 3:38 PM delete

sir,what is the total estimate of the project?

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July 27, 2012 at 6:18 PM delete

Oh great, it's already there, I didn't remember that I already have one solar inverter article posted in this blog.

You can make this circuit, the total cost approximately would be around Rs5000/- , excluding the solar panel.

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Naina
August 21, 2012 at 7:54 PM delete

Sir, I am not able to understand the circuit diagram properly... Could you please elaborate it..?

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August 21, 2012 at 10:06 PM delete

Hi Naina,

The explanation will be huge and cannot be accommodated here, you will have to understand it yourself, I will guide you if required.

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Anonymous
August 24, 2012 at 8:30 PM delete

Hi,
I just want to know the use of the NAND gates and the MOSFET's.

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August 24, 2012 at 9:32 PM delete

N1 = wired as an oscillator,

N3, N4 = Wiredas biffer and for alternate pulses for the mosfets.

Mosfets are used for receiving alternate 50 HZ pulse from the respective gates N3, N4, and conduct alternately for powering the transformer and for producing the output ac.

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Anonymous
August 24, 2012 at 10:18 PM delete

thanks a lot for the prompt reply. I am making this for my final year diploma project in electronics and communication.

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Anonymous
August 25, 2012 at 8:46 PM delete

Sir,
I would like to know if we increase or decrease the resistor values in the circuit, what will be the affect on the performance of the circuit? Also, kindly let me know the ideal rating for the battery used and the maximum load permissible.
Thanks.

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August 26, 2012 at 7:54 AM delete

Different resistors are there for different functions.

Battery and the transformer can be modified for getting a max 200 watts of power from this circuit.

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August 27, 2012 at 1:09 AM delete

Sir, what is connected between mosfets and transformer with a red +ve mark.
Thanks

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August 27, 2012 at 1:28 AM delete

Sir,
One more thing, connection from the battery's -ve terminal is going to unused nand gate.
How this circuit will work without connecting -ve terminal to somewhere else?

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August 27, 2012 at 11:40 AM delete

I have corrected the diagram, please check it now.

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September 2, 2012 at 12:59 PM delete

Sir,
Please give us 1000w solar inverter circuit.
Thanks.

Best Regards.

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September 2, 2012 at 3:20 PM delete

OK, I'll try to post one soon...

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September 7, 2012 at 12:28 AM delete

Sir, I have some very useful circuits too.
But I don't know hot to post it on your blog.
Can you please help.

Thanks.
Best Regards.

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September 7, 2012 at 9:20 AM delete

Hi Rashid,

You can send them to homemadecircuits@gmail.com I'll be most glad to publish them in my blog.

But kindly note that the diagrams should be your own creation or at least drawn by you.

Thanks and Regards

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September 8, 2012 at 5:06 PM delete

Sure Sir, I will mail you soon.

Best Regards.

Rashid R. Ansari

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September 8, 2012 at 5:43 PM delete

sir can we make solar panel without any transformer ?????

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September 8, 2012 at 6:41 PM delete

do you mean solar panel inverter without transformer???

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Anonymous
September 8, 2012 at 7:43 PM delete

sir is this really works?

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September 9, 2012 at 10:41 AM delete

The concept is correct according to me....so should work

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September 11, 2012 at 3:55 PM delete

sir , i also work on a project related to solar panel. i want to know cheap and perfect circuit of a 150 watt inverter , so guide me sir..

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Anonymous
September 11, 2012 at 7:51 PM delete

Where can i get the detailed working of this circuit? As in the function of individual components in converting dc to ac.

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September 11, 2012 at 9:50 PM delete

I'll try to find a simpler circuit, if i find one will surely contact you.

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September 11, 2012 at 10:12 PM delete

Here:

http://homemadecircuitsandschematics.blogspot.in/2012/02/how-to-make-simplest-150-watt-mosfet.html

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Anonymous
September 11, 2012 at 11:24 PM delete

Thanks a lot sir. :D.

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Anonymous
September 12, 2012 at 10:28 AM delete

For generating 10 A. Each solar cell should have what specifications if using 72 cells.

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September 12, 2012 at 11:21 AM delete

If put in series all should be rated at 10A, if put in parallel then each may have 10/72 = 0.13 amps rating

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Anonymous
September 13, 2012 at 8:01 PM delete

I am making this project. Can you please tell me required components and the specifications of each component. We will not require large amount of power. I am going to buy the components tomorrow. So I want to make sure that there is no problem. A 12 v car battery is okay? Please help me

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September 13, 2012 at 9:34 PM delete

The circuit has not been practically tested, especially the inverter section. Though I believe this circuit should work, I cannot provide any guarantee regarding its working.


Kindly read the "disclaimer" at the top left of the page.

Regards.

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Anonymous
September 14, 2012 at 8:23 PM delete

I know that it's just in theory. But I just want to know what specification components you recommend.

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September 14, 2012 at 8:35 PM delete

can you give me the detailed design and the formulas used.also let me know about the reference books that will be useful to know more about the topic

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September 15, 2012 at 1:12 PM delete

All resistors are 1/4w, CFR, 5% except R3/R4 which are 3 watts rated wire wound type.
The 7812 caps may be non polar or electrolytic.
C1 is disc ceramic type,
The BC557 transistor is wrongly given, it should be BC547.

Rest of the materials are as given in the diagram....

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September 16, 2012 at 9:25 AM delete

There are not much calculations to be done, the formula for setting N1 may be understood from this article:

http://homemadecircuitsandschematics.blogspot.in/2012/04/make-this-astable-multivibrator-blinker.html

The formula for calculating R3/R4 has been already given in the article. You can get more info here:

http://homemadecircuitsandschematics.blogspot.in/2012/04/how-to-make-solar-battery-charger.html

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September 20, 2012 at 12:59 PM delete

From the negative end of the battery you have connected to the ammeter from that you have connected to the unused gate before that u gave one space is that jump or connection in between them.

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September 20, 2012 at 3:45 PM delete

Yes it's a jump, if you connect it, would create a big short circuit.

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Anonymous
September 26, 2012 at 7:21 PM delete

What would create a short circuit?

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Anonymous
September 26, 2012 at 7:26 PM delete

Can you suggest a solar panel for my project. Need just enough power for few bulbs. Around 80 watts. Can you suggest a panel configuration? Which I can buy practically.

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September 26, 2012 at 9:09 PM delete

Please refer the above comment by Prince.

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September 26, 2012 at 9:13 PM delete

Please refer the following link:

http://jiaxingyuantong.en.alibaba.com/product/295531864-209437812/80_Watt_Solar_Panel_12V_DC_RV_Battery_Charger.html

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Anonymous
September 27, 2012 at 11:23 AM delete

What ia the value of r3 and r4?

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September 27, 2012 at 12:44 PM delete

R3 = 0.7/I, where I = 1/10th of the battery AH

R4 =2R3

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October 7, 2012 at 3:35 PM delete

hi sir am a final year engineering student and i want a project on invertor and charging controler for a solar panel.

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October 7, 2012 at 3:44 PM delete

Hi Willie,

You can try the circuit discussed in the above article.

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October 7, 2012 at 3:51 PM delete

hi sir a final year engineering student and i want a project on invertor and charging controller for a solar panel.

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Anonymous
October 7, 2012 at 4:40 PM delete

Sir,
If a panel of about 50-80W is used. What changes in the values of the components will be required? I am making this project. But we are just going to use it to power few bulbs. Hence, the power requirement is not high. Please help me.
Thanks.

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October 7, 2012 at 6:40 PM delete

No changes will be required, just make sure the open circuit voltage of the panel does not exceed 30V.

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October 11, 2012 at 3:23 PM delete

we have already one inverter in home... if we buy solar panel and give connection to tat inverter means its enough or we need to buy new inverter???

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October 11, 2012 at 3:56 PM delete

No need of buying a new inverter, you can directly connect the following circuit to your existing inverter unit.

http://homemadecircuitsandschematics.blogspot.in/2011/12/how-to-build-solar-panel-voltage.html

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October 27, 2012 at 6:39 PM delete

Can we make the solar panel inverter without transformer?

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October 27, 2012 at 10:02 PM delete

Yes we can make it, but it will work only during day time...

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November 17, 2012 at 3:02 PM delete

Is it sufficient to use a 30V/8A solar panel for this circuit...?
If not, please mention the appropriate ratings of the battery?

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November 17, 2012 at 5:26 PM delete

R3 = 0.6/Battery charging rate

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November 17, 2012 at 5:29 PM delete

Yes that will be more than sufficient, because the IC will pass not more than 5Amps to the battery.......the battery can be rated at 25AH

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November 20, 2012 at 11:17 PM delete

hello sir, i am doing a project based on solar inverter. if you dont mine, will you help me i need some clarification about this circuit if you are intrested plese send me some information about this to my mail id: karanpanday007@gmail.com

thankyou sir.

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November 21, 2012 at 9:20 AM delete

You can ask the questions here, I'll try to answer it.

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Anonymous
December 16, 2012 at 6:48 PM delete

How much battery for 1000w solar inverter?
How many hours backup time?

I need detailed circuit for solar inverter
my id : inventerkkd@yahoo.com

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December 17, 2012 at 8:05 AM delete

Battery will depend on how much load you want to drive from the inverter. THe battery AH should be at least 3 to 4 times the load current.

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Anonymous
December 20, 2012 at 12:07 AM delete

sir, i want a circuit diagram for connecting both solar current & normal home current to a inverter which is in my house

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December 20, 2012 at 11:03 AM delete

You may try this circuit:

http://homemadecircuitsandschematics.blogspot.in/2012/10/solar-panelac-mains-relay-changeover.html

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Anonymous
December 20, 2012 at 3:11 PM delete

Which battery can be used? I am making this for my project. Car battery is very expensive.

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December 20, 2012 at 8:25 PM delete

smaller battery will produce less power, bigger batteries will produce more power.

you may use a 12V 10 AH SMF battery.

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Anonymous
December 21, 2012 at 9:16 PM delete

sir, i am doing project on solar power inverter .inverter rating is 6 KVA where can i find circuit diagram for this inverter plz help me sir.

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December 22, 2012 at 1:49 PM delete

I tried to search online for a 6kva inverter circuit but couldn't find any....if I get one luckily will inform you.

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Anonymous
December 27, 2012 at 9:36 AM delete

sir can we connect solar pannel directly to inverter without battery banks? help me

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Anonymous
December 27, 2012 at 9:42 AM delete

sir for my final year project i need a inverter circuit which can directly convert solar pannel dc voltage into ac without using battery.please reply and help me.i can't get answer nowhere.help me plzz. my mail id: sankar.sankar25@gmail.com

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December 27, 2012 at 11:43 AM delete

In the above circuit?? yes it may be done.

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December 27, 2012 at 11:57 AM delete

You may use the above shown circuit, just remove the battery from its position and also the ammeter, diode switch etc.

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Anonymous
December 28, 2012 at 7:57 AM delete

can we use 100ah battery for this circuit? and what is the output wattage of this inverter?

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shankar
December 28, 2012 at 8:09 AM delete

sir i want to use 100 watt 12volt solar pannel and 100ah battery with 200watts inverter output, is this possible in this circuit,if yes what are the modification i want to do in this circuit.reply please..

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shankar
December 28, 2012 at 8:10 AM delete

is this circuit need charge controller?

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shankar
December 28, 2012 at 8:19 AM delete

sir for connecting pannel directly to 200watt inverter what is the wattage of solar pannel i need?

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December 28, 2012 at 9:13 AM delete

100 ah can be used for longer backups, the wattage will depend on the current ratings of the mosfets, transformer and the battery.

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December 28, 2012 at 9:18 AM delete

yes it's possible according to me, you will have to use a 12-0-12/20 amp transformer, 30amp mosfets for getting 200 watts.

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December 28, 2012 at 9:19 AM delete

over-charge controller might be required if you want it to be automatic.

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shankar
December 28, 2012 at 12:08 PM delete

sir the unused gate is not connected please give the corrected diagram url link..

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shankar
December 28, 2012 at 12:14 PM delete

from where we can give +ve and ground to nand gate.

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December 28, 2012 at 1:11 PM delete

wattage can be anything, but voltage should not exceed 15V

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December 28, 2012 at 1:24 PM delete

the diagram is correct........"unused" refers to "not connected".

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December 28, 2012 at 1:25 PM delete

from the supply which would operate the inverter.

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shankar
December 28, 2012 at 5:36 PM delete

sir what is the use of ic7812.

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December 28, 2012 at 8:43 PM delete

the ic cannot tolerate more than 15v, the 7812 ic restricts the voltage to 12v and stops damage to the IC from high voltages.

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shankar
December 30, 2012 at 8:24 AM delete

sir to use change over relay in this circuit as you shown in one of your solar inverter. where should i connect relay in this circuit to change inverter circuit from solar pannel to battery in night time.

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December 30, 2012 at 9:50 AM delete

You will have to use a light sensor/relay driver as shown in this circuit:

http://homemadecircuitsandschematics.blogspot.in/2012/11/solar-invertercharger-circuit-for.html

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Anonymous
January 2, 2013 at 12:14 AM delete

sir i am building a solar panel. in panel each solar cell is 3.10 watt and total 36 cells(111.6watts) i think it produces nearly 32volts. is this circuit useful for my panel please help me

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Anonymous
January 2, 2013 at 6:11 AM delete

sir is this charge controller is maximum power point tracking type ,if no please give MPPT charge controller for 12 volt 10 amp solar pannel.

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January 2, 2013 at 9:52 AM delete

Yes the above circuit will work but the input voltage should never increase above 32V, that's the max tolerable threshold of the IC.

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January 2, 2013 at 9:54 AM delete

No the above design is a voltage/current controlled charger not MPPT.......MPPT require uprocessors, which is difficult to design and optimize

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Anonymous
January 3, 2013 at 9:12 AM delete

sir if my solar panel produces more than 40volts what changes i have to do in the circuit please help me

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January 3, 2013 at 11:06 AM delete

No, the above circuit cannot be modified for voltages above 32V.

You may try the following circuit instead:

http://homemadecircuitsandschematics.blogspot.in/2012/10/high-voltage-high-current-dc-regulator.html

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Shankar
January 3, 2013 at 11:17 AM delete

Sir could you please tell me the Ic number for 30 amps mosfet.

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Anonymous
January 4, 2013 at 1:57 AM delete

sir,could you plz send the design of this circuit diagram...

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January 4, 2013 at 10:03 AM delete

If I get time I'll surely try to update the PCB layout here.

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Anonymous
January 6, 2013 at 3:05 PM delete

sir how to build a 1kw inverter

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January 6, 2013 at 4:37 PM delete

sir plz give me clear circuit diagram of Solar Inverter Circuit.. i give my mail address (geevi003@gmail.com)

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January 6, 2013 at 9:42 PM delete

You can try this circuit:

http://homemadecircuitsandschematics.blogspot.in/2012/05/make-this-1kva-1000-watts-pure-sine.html

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January 6, 2013 at 9:49 PM delete

Cool baby, please click the diagram to enlarge it

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Anonymous
January 7, 2013 at 8:13 PM delete

what kind of converter used in this circuit sir?
buck,boost or buck boost

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Anonymous
January 7, 2013 at 8:36 PM delete

what is the operation of ic7812?

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January 7, 2013 at 9:52 PM delete

ordinary boost or step-up inverter

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Anonymous
January 8, 2013 at 3:57 PM delete

sir is this circuit give 220 volts ac output if it is OK then can we connect 200 ah battery please help me?

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January 8, 2013 at 5:53 PM delete

The inverter will give a 220V ac, and yes you can connect a 12V 200AH battery with it, but the solar panel/controller will not charge a 200 ah battery.

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Anonymous
January 8, 2013 at 7:22 PM delete

why sir? then how can i recharge the battery

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January 8, 2013 at 9:27 PM delete

The IC 338 can handle only upto 5amp which will allow charging of upto 50 ah batteries, not above that.

You will have to connect an overboard transistor for upgrading the current capacity of the circuit.

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Anonymous
January 8, 2013 at 9:51 PM delete

sir this charger can charge 100ah battery? if no what are the modification i have to do.

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January 9, 2013 at 12:20 PM delete

I have updated the article, please check it.

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Anonymous
January 10, 2013 at 12:30 PM delete

What is the number of the two 10 amp diodes used in the circuit?
Can i use MIC BR34 12 amp. It is a bridge rectifier.

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Anonymous
January 10, 2013 at 12:31 PM delete

Sir, do you have the layout for this circuit? I need it for my project. Please help.

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January 10, 2013 at 8:39 PM delete

Actually it should be 30 amps each.....use 3 in parallel for each diode.

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January 10, 2013 at 8:42 PM delete

I am sorry, layout will be difficult for me to provide....you will have to do it yourself.

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January 11, 2013 at 1:33 PM delete

hello
please can you explain the connections of the gates i dont understand them
thank you for your work

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January 11, 2013 at 8:37 PM delete

The inputs of each gate are shorted together. Please refer 4093 datasheet to know about the gate pin out numbers.

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Anonymous
January 12, 2013 at 12:23 AM delete

your are genius. please add battery protection circuit ( over charging and low voltage cut off circuits)

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Anonymous
January 12, 2013 at 12:40 AM delete

sir how to connect a solar panel to general inverter.

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January 12, 2013 at 11:17 AM delete

You will have to incorporate a charger/controller circuit between the inverter and the panel, as shown in the above article.

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Anonymous
January 13, 2013 at 9:35 AM delete

sir can i connect 100watts solar pannel to drive load of 100 watts directly.
or what is the wattage of solar pannel i need to connect 100 watts load directly with 40ah battery charging.

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January 13, 2013 at 8:08 PM delete

Your question is not clear...what kind of load do you want to connect? Due you want to connect a battery as the load? Is there an inverter involved? please clarify.

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Anonymous
January 14, 2013 at 12:22 PM delete

sir i want to connect 100 watts load directly without battery. what is the wattage of solar pannel i need?

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Anonymous
January 16, 2013 at 6:33 PM delete

what is the purpose of switch s1?

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Anonymous
January 16, 2013 at 6:38 PM delete

can we make solar panel by our own,,by the reference in youtube??

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January 16, 2013 at 9:35 PM delete

yes we can make it as per the guidelines.

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Anonymous
January 16, 2013 at 10:02 PM delete

sir i am building a solar panel it gives nearly 50volts dc out put please suggest me a good inverter circuit

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January 17, 2013 at 9:45 AM delete

during night when there's no solar power, S1 may be switched ON for connecting the battery with the inverter.

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January 17, 2013 at 9:48 AM delete

what is the current output of the solar panel?

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January 23, 2013 at 5:22 PM delete

hi sir,what will be the cost of production?....
is it possible to make a model for mini project with low cost?.....

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Anonymous
January 23, 2013 at 6:47 PM delete

sir will you help me to make a simple solar inverter for my mini project?
and also circuit diagram and required components,
plz sir...
or give me a link address...plz sir...

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January 23, 2013 at 9:54 PM delete

Hi Rakesh,

I am not sure about the cost....you will have to inquire with your local dealer.

The above circuit is itself quite mini.

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January 23, 2013 at 10:08 PM delete

you can try this circuit:

http://homemadecircuitsandschematics.blogspot.in/2012/11/solar-invertercharger-circuit-for.html

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Anonymous
January 26, 2013 at 11:02 AM delete

sir
can we use general inverter substitute of solar grid inverter for the solar panels if possible please help me

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January 26, 2013 at 9:45 PM delete

You mean using a general inverter as a grid tie inverter?

No that would be disastrous.

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Anonymous
January 27, 2013 at 3:56 PM delete

sir can you give substitute ic for LM338 and TIP36. these are not easily available

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January 27, 2013 at 9:35 PM delete

sorry, there's no substitute for them....

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Anonymous
January 28, 2013 at 9:22 PM delete

sir, i am bisically a 4th year student from EEE branch and opting for solar power invertor for the main project.
requirements: invertor design which can illuminate 2 tubelights and a fan for our own class room. Can u suggest the circuit for the above requirement.

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January 29, 2013 at 11:38 AM delete

You may try the above shown circuit, if the transformer and the battery are appropriately rated would provide you with the required power.

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February 2, 2013 at 11:50 AM delete

sir ,
i want 250VA ups circuit diagram..

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Anonymous
February 4, 2013 at 10:16 AM delete

sir,i wank 1kw solar inverter circuit diagram with correct ratingsplz

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Anonymous
February 4, 2013 at 6:18 PM delete

Great job Sir. I need a programme to make my circuits like yours which seem neat!

Can you please tell me what is the programme that you are using? It gives nice diagrams!
Can it do simulations of the behavior of the components?

I am using Pspice at the moment which I don't find handy at all and it lacks a lot of components that I need to find and download through libraries.
Thanks in advance Sir!

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February 4, 2013 at 7:16 PM delete

make the above circuit first then upgrade it to 1kva.

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February 4, 2013 at 7:38 PM delete

Thanks!

I use corelDraw for drawing the schematics, the symbols are all drawn by me and stored in the "symbol manager library" so that I can use it whenever I need them while drawing the circuits.

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Anonymous
February 4, 2013 at 9:50 PM delete

sir,i want to do solar street light system for real time using from one street i want to connect paralley anothey 5 lights how much battery rating will be used,and i also want to do solar inverter for that how rating it should contain...

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February 5, 2013 at 9:10 AM delete

it will depend on the wattage of the connected lamps or the load.

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Anonymous
February 5, 2013 at 9:29 AM delete

pannel is 100w we r using.battery 24v

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Anonymous
February 5, 2013 at 1:49 PM delete

60W LED for one street light

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February 5, 2013 at 9:09 PM delete

for supporting the 5 posts you would require a battery that would keep 60 x 5 = 300 watts illuminated for 12 hours....a 200 ah battery would be required for it.

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Anonymous
February 7, 2013 at 9:11 PM delete

can i use this charge controller for charging 12 volt battery.

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Anonymous
February 14, 2013 at 11:51 PM delete

sir I am having an inverter circuit with 1.2kw ..some of them are saying there some mistakes in that circuit cau you help me where is the mistake....

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Anonymous
February 21, 2013 at 7:39 PM delete

Sir,
you are indeed a great brain.

Kindly help me out with the steps to designing an inverter rated 3kva.
I am also ready to work with u.
I will also want to know if there is any training available on designing electronics circuits.

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February 22, 2013 at 12:51 PM delete

Thanks!

I'll try my best to help you.

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Anonymous
February 27, 2013 at 9:14 PM delete

sir the R1 value depend on charcing current then how can i connect load directly without batery. if i want to connect one ceiling fan as load with 100 watt pannel without battery then what is value of resistor.

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February 27, 2013 at 9:58 PM delete

That's a good question, if you are using the system directly without a battery then you may set R1 such that it allows only the amount of current which doesn't exceed your maximum load ratings.

example if your load is 100 watts, divide this with 12, 100/12 = 8.33Amps

Next, 0.6/8.33 = 0.072 ohms, this would be the value of R1.

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Anonymous
March 1, 2013 at 12:06 PM delete

Hi Swagatam,

do you have any thing based on microcontroller

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Anonymous
March 1, 2013 at 8:55 PM delete

sir if i want to connect 40 ah battery to this inverter, then that 40amps current will damage the IC or not. what can i do to protect oscillator IC.

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March 1, 2013 at 9:43 PM delete

there won't be any problem as long as the rated voltage is 12.

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March 2, 2013 at 7:54 AM delete

I'll try to update MC based circuits too in this blog soon....

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Anonymous
March 2, 2013 at 8:40 PM delete

sir when i give 12volt for this inverter from regulated power supply i get 45 volt in the output of transformer. i cant troubleshoot. please tell what will the problem.

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Anonymous
March 2, 2013 at 8:52 PM delete

sir you told that if transformer is 15 amps then the output can increased to 200 watts. (15amp*12 volt). then for 1kva inverter we need huge transformer???
then how power is increased for high power output.

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Anonymous
March 2, 2013 at 8:58 PM delete

sir, the open circuit output voltage i measured is 450volt(overvoltage). but when i connect frequency meter for testing i get voltage value as 210volts. why?

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March 3, 2013 at 9:03 AM delete

at which points did you check the voltages?? I didn't quite understand your question...

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March 3, 2013 at 9:08 AM delete

your power supply should be 10 amp rated.

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March 3, 2013 at 9:11 AM delete

for getting 1kva with 12v you will require a huge transformer....you need to increase the Volts to may be 60V for reducing the size....as volts increases current decreases and so does the size of the trafo....

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Anonymous
March 3, 2013 at 4:19 PM delete

transformer secondary(hv side).

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Anonymous
March 3, 2013 at 4:23 PM delete

how much power will this inverter consume.(self consumption)

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March 4, 2013 at 11:11 AM delete

what is the input voltage?

by the way a frequency meter will show frequency, and not voltage...

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Anonymous
March 5, 2013 at 8:24 AM delete

is there any advantages in using this regulator circuit over one which we buy in shop.

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March 5, 2013 at 6:09 PM delete

yes, one big advantage: you can see the circuit here, understand the functioning, and optimize the results as per your specs and desires.

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Anonymous
March 6, 2013 at 4:26 PM delete

sir i use general purpose pcb to for soldering this circuit and i used single strand bread boarb wire for inter connections. when i connect this circuit to 12volt 40ah battery the wires get melted. what can i do??????

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March 6, 2013 at 7:44 PM delete

there may be a short circuit in you connections, check it properly, disconnect the inverter section, and connect only the charger section first to the battery.

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Anonymous
March 7, 2013 at 7:51 PM delete

what type of wire should i use for circuit connection too withstand high current(40AH). when i connect this circuit in 2 amps 12 volt supply the circuit is working but when connected to 4oAH supply wires get melted.

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March 8, 2013 at 9:37 AM delete

what load have you used with the inverter???

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March 9, 2013 at 9:20 AM delete

at 100 watts, your circuit will consume 100/12 = 8amps, so use wires which can withstand 10 amps of current, use industrial motor wire for the connections.

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Anonymous
March 9, 2013 at 11:04 AM delete

can i use this thick wires for interconnection of components(IC) in general purpose pcb.

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March 9, 2013 at 8:07 PM delete

which wires are burning?

replace only those wires.

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Anonymous
March 14, 2013 at 9:41 PM delete

sir i built a solar panel with 111.6 watt the panel is giving output of 20volts how can i charge the 150ah battery and how many hours will take to fully recharge the battery. please help me sir

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Anonymous
March 15, 2013 at 12:01 PM delete

can i run a ceiling fan with this inverter using 20ah 12volt battery.

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March 15, 2013 at 12:43 PM delete

you may utilize the last circuit LM338 stage for chaging the battery, it might take about 7 + 7 hours (two days) to get fully charged under full sunlight.

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March 20, 2013 at 7:21 PM delete

sir,
what was R3 resister range in the ckt? can you plz tell me?

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March 20, 2013 at 9:39 PM delete

It will depend on the battery AH rating...

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March 23, 2013 at 12:21 PM delete

sir, where to connect the load and see the output?

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March 24, 2013 at 6:03 AM delete

sir in day time pannel is connected to battery and load. For battery it need 14.4volt for charging. for load(inverter) it need 12.6volt(as battery) so how to vary regulator voltage to supply the both.

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March 24, 2013 at 9:48 AM delete

That won't be possible, because the charger has only one control in the form of P1.... what kind of load have you connected??

You can probably add three 6A4 diodes in series with the positive for feeding the load, this would drop about 2V from 14.4V.

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March 25, 2013 at 3:42 PM delete

sir 1)the regulator maintains the voltage when exceeds the fixed value but not maintain when reduced below fixed value why?
2)is there any way to maintain voltage at 14.4 when voltage varies from 10volt to 18volt.
3) what type of regulator is this boost or buck.

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March 25, 2013 at 7:45 PM delete

LM338 will provide a precise fixed voltage as per the setting of the pot with any input that's 1 volt higher than the set voltage, upto 30 volts max.

please refer LM338 datasheet to get all the info.

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March 30, 2013 at 8:59 PM delete

can i use 12volt zener diode in parallel to reduce 14.4 volt to 12 volt.

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April 1, 2013 at 8:43 PM delete

when i connect this inverter to 12volt 20ah battery the output voltage i get is 290volt. how can i get 220 volt.(transformer used is 12-0-12volt 10 amps)

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