Inverter circuit project - up to 500 Watt

This is a complete inverter circuit project which features automatic mains switching, automatic charging when mains is present, and automatically starts inverter when mains is off.

Get the full size inverter circuit diagram pdf from HERE.

As this project is fairly long and time consuming, so we've divided it part by part, find out the steps below.

Steps of Inverter circuit project

For the oscillator part, you have three choice. You can use either a 4047 based square wave oscillator, or the SG3524 PWM oscillator or the 74LS112 based Oscillator.

Square wave inverters are sufficient to run mobile chargers, CFLs or LED lights. However if you're planning to run inductive loads like a Fan or AC motor, then choose the SG3524 based PWM oscillator or the simple modified sine wave inverter.

Below the steps to make the complete inverter project.

1. CD4047 based oscillator section
2. Inverter power stage with MOSFET
3. Assembling the parts and different section
4. Optional, convert it to sine wave inverter
5. Battery low voltage cut of circuit, if you need
6. Optional, an automatic changeover circuit

Also have a look at this simple yet powerful 250 watt inverter project.

Comments on this article before 07-12-2011, here jump to recent comments.

• vijay on September 24, 2011 - 3:24 amSir,
  Thank you for your valuable guide.
  Sir, I want to build solar inverter for driving A.C. load of 200watt for 5 hours. Also I want to charge battery by solar as well as A.c. 230 volts But preference to solar . Since in Maharashtra now tariff rate is very high. Also load shading problems.

• Matt on October 21, 2011 - 8:04 am

  

  Thank for this useful info. I dont know much about electr that is why i need a clear picture on how the component/parts are fixed to the board. You can help me send it to my email- victory4m@yahoo.com. Thank you

• Matt on October 22, 2011 - 5:38 am

  

  Pls, i also need clear schmatic of the project

  Arup Reply:
  October 22nd, 2011 at 3:50 pmSchematics is the first picture. Right click and save target as to get full resolution image.

• Matt on October 23, 2011 - 7:32 am

  

  I have done that but is not clear. I can’t get the real picture

  Matt Reply:
  October 23rd, 2011 at 9:10 amThank u, is very clear now.

• Matt on October 26, 2011 - 4:48 pm

  

  Can i use to charge 12v 70ah battery?

  Arup Reply:
  October 27th, 2011 at 12:08 pmTo charge 70Ah battery, you need atleast 7Amps transformer for C/10 mode.

• Matt on October 27, 2011 - 2:38 pm

  

  For my inverter transformer-primary(723turns) and sec(36). And i have 12v 70ah for the inverter. What is my transformer amps rating. If is not suitable what should i do?

  Arup Reply:
  October 27th, 2011 at 3:27 pmTransformer Amps can’t be determined by counting number of turns.
  Generally 6-7Amperes transformers weight around 5Kg.

  Mujtaba Ali Reply:
  November 4th, 2011 at 5:15 pmfirstly u have to tell us your load power in watts? wothout max power it is not possible that i help u?

  Matt Reply:
  November 11th, 2011 at 8:44 pmThe load 600w max.

• Matt on November 1, 2011 - 11:57 am

  

  Concerning the relay, pls explain the pins, and how to connect the pin to regulator and the output of the inverter.

  Mujtaba Ali Reply:
  November 4th, 2011 at 4:43 pmDear Matt
  use this relay for automation & note that the relay(shown in linked relay circuit) pin no:1 & 9 connect with circuit relay pin 11 & 21 respectively, and relay pin no: 6 & 10 with circuit relay pin no:14 & 22,here is link which aded ….http://www.futurlec.com/Relays/GR220PIN4P.shtml

• Matt on November 11, 2011 - 8:48 pm

  

  I buy one 220vac, 12vdc. But the pins does not av number.

• Matt on November 15, 2011 - 4:55 pm

  

  Tell me the function of those diode and why we use 7809 regulator not 7805 or 7812. And can this inverter charge 12v 100ah battery.

• Mujtaba Ali on November 15, 2011 - 6:04 pm

  

  re check the given link,here is solution off your problem,bcoz any 220VAC relay pins are like given link relay pins…..for just 14 pin type of relay…ok

  [Reply]

• Mujtaba Ali on November 15, 2011 - 6:06 pm

  

  and you have to need also to follow this link,
  http://www.futurlec.com/Pictures/GR110PIN4P_Dimensions_B.gif

• Mujtaba Ali on November 15, 2011 - 6:14 pm

  

  that is also in your mind that when you start design inverter circuit, for this purpose you have need re wounded tranformer,bcoz the tranformer which is available at shops can not provide require voltage when you supplied it by battery…..so you have use your own rewounded tranformer for good voltage regulation on Load……..