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Wednesday, 11 April 2012 18:48

How to Make 500 Watt Power Inverter UPS "uninterruptible power supply" Homemade DIY PROJECT Featured

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500 Watt 12 VDC to 220 VAC Power Inverter (UPS) 500 Watt 12 VDC to 220 VAC Power Inverter (UPS) Pakistan Science Club

How to Build a 12vDC to 220vAC Power Inverter (UPS) uninterruptible power supply


Power inverter is a device which converts 12 volts to 150 volts of D.C into 220 volt to 110 volt. Power inverter is commonly known as UPS. UPS stands for uninterruptible power supply which is the modified form of inverter. Due to the lack of electricity the importance of inverter increases day by day. The substitute of load shedding is generator or UPS.

Few advantages and disadvantages of generator are as follows.

Its first advantage is, it can run many electronic devices and it can supply electricity for the long duration of load shedding. The disadvantages are noise pollution, usage of fossil fuel cost it too high. The alternate of generator is UPS, it has also some advantages and disadvantages.

The supply of electricity goes uninterrupted, it do not require much effort. Its backup depends on battery, as many amperes of the battery it has, that much it backup it would provide.

Its disadvantages are, recharging takes a lot of time and in the long duration of load shedding battery cannot b recharged so that it stops working. By putting excessive load the duration of backup reduces. Its performance is about 60% to 90%.

Today I will teach u how to make 500 watt inverter which anybody who has fundamental knowledge of electronics can make it.

Following things are required for its construction.


  • Transformer 40 amps (500 W), 220 V, 12X12 V
  • Transistor (10) 1047
  • Resistor (1) 500 ohms
  • Battery 40 Ampere
  • Multi meter
  • Capacitor 250 V, 0.5 uf
  • Wires, soldering wires,
  • Soldering iron


First of all you have to make some changes in transformer. If u are using 500 V transformer then take 18 to 22 gauge copper wire and on the one side of transformer’s core  make five turn and put a point on it, and turn this point, and again turn the wire five times on the same direction. In this way u get three terminals. If u r connect the transformer to 220 V power supply then it gives 1.5 V on both terminals. Now put transformer D1047 on the palm of your hand and turn it such a way that number appears your way. Now you will see three points. The point on your left side is known as (B) Base, middle one is collector(C) and the right one is (E) emitter . (These are the information only for D1047)

500 Watt Inverter schematic diagram

500 watt UPS inverter circuit diagram

Now first of all tight the 5 transistor in heat sink in series with the help of nut bolt. Connect the base of all five transistors altogether and then join the points of collector together.

In the same way arrange the other five transistors individually and connect the collector(C) of both sides of transistors with the outer terminal of secondary coil, after that connect the both outer terminals of the third coil with the base of the both heat sinks of transistor. then connect the (E) emitter of both side by wires n then connect the 500 ohm resistor on emitter and resistor on either side. Now connect the middle terminal of primary coil by one to two ft long wire and clip (crocodile) it and attach this terminal always by the positive terminal, and with the negative terminal of battery connect the both (E) emitter of transistor.

After that the central point of the third coil and a wire attach it with emitter to connect using a heavy ampere switch between both terminals of the Inverter primary coil to apply a capacitor which will prevent the current from the sparking. inverter will switch on as soon as starting to work.

Discussions about Pakistan Science Club's Power Inverters 12 VDC to 220 VAC UPS, you can find problems, troubleshooting and construction help Please visit Power Inverters (UPS)12 VDC to 220"


With both the terminals of battery connect the positive and negative wires to its terminals positive to positive and negative to negative and then open the switch, slightly vibration starts in the inverter as switch is open. Now you can run it into 1 to 500 watt load.

Power Inverter Wattage Chart


voltages (Input)

Transformer Amps Transformer watt No of Transistors D1047
50 watt inverter 12 V 4 A 50 W 2
100 watt inverter 12 V 10 A 100 W 4 to 6
300 watt inverter 12 V 25 A 300 W 6 to 8
500 watt inverter 12 V 40 A 500 W 8 to 10
1000 watt inverter 24 V 45 A 1000 W 20 to 26
3000 watt inverter 24 V 125 A 3000 W 40 to 50
5000 watt inverter 48 V 105 A 5000 W 60 to 70
Note. table shows that requirement of D1047 transistors for different power inverter wattage


You will need to switch off for battery charging and connect the primary coil indirectly with 220 V of power supply, after that battery will start charging. To converts it into UPS you needs only one relay. These relays are AC 220 V and 4.4 terminals.

For online help visit http://forum.paksc.org/Forum-Homemade-UPS-inverter

Trouble shooting:

If you do not start to switch on to check the following items

1. Spark the place where resister is attached for one second

2. If it will not start yet then detached the connection between base wire and coil and rearranged it.

If you want further details then join Pakistan science club All right reserved This project cannot be published without the permission of science club

Contact: This email address is being protected from spambots. You need JavaScript enabled to view it.

See also

Easy Homemade 50 watt Power Inverter (12 VDC to 220 VAC) UPS

Power Inverter (UPS) Circuit inverter diagram

Schematic of an Inverter Circuit

WHAT IS THE Difference between an inverter and UPS? (Forum)

How to find emitter base and collector of D1047 Transistor?

12 VDC Inverter System Troubleshooting & Maintenance

Difference between Voltage-Amps (VA) and watts ?

500 Watt 12DC to 220 VAC Power Inverter (UPS) Photo Gallery


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  • Comment Link Thursday, 18 April 2013 01:17 posted by ilan

    hello friend and thank you for your answers.
    i like to build a 24v - 220v 5000w inverter,
    can you please help me with the diagram and some tips?

    do you think that using toroid transformer is better?


  • Comment Link Sunday, 14 April 2013 20:12 posted by Noble

    Your started that for charging "You will need to switch off for battery charging and connect the primary coil indirectly with 220 V of power supply, after that battery will start charging. To converts it into UPS you needs only one relay. These relays are AC 220 V and 4.4 terminals"

    Please, I would like to know how to convert the circuit into UPS by using a relay. Could you please post a circuit diagram showing how to connect the relay. Thank you for your response.

  • Comment Link Monday, 28 January 2013 14:15 posted by Guardian

    Hi, Why cant we put all the transistors in one line? inputs/outputs and connections are identical so why do we need two array of transistors

  • Comment Link Saturday, 19 January 2013 09:15 posted by guna raj

    sir how to use this circuit without using the transistors for charging?????????

  • Comment Link Wednesday, 16 January 2013 08:43 posted by tykimky

    i would like to as you for transfomer 48V

    DC secondary power 0.7V or 1.5V Thank you

    Warm Regards

  • Comment Link Thursday, 08 November 2012 03:54 posted by Gene

    *I am interested on this circuit, but i have a question, can i use TIP3055 instead of D1047 transistor?

  • Comment Link Thursday, 18 October 2012 13:25 posted by Dare

    I just started searching inverter, I will like to practice this circuit. Please can you help me with some key ideas of how to start out practicing.

  • Comment Link Monday, 01 October 2012 12:56 posted by Asad

    Sir what will be the amperes of the battery that we would be using with the ups for 50 100 and 300 watt. Waiting for reply ! :)

  • Comment Link Friday, 21 September 2012 14:11 posted by alex

    it's work continuesly 12 hour in day to day

  • Comment Link Wednesday, 19 September 2012 17:01 posted by suraju

    i will like how to build dc to ac inverter with simple components

  • Comment Link Tuesday, 11 September 2012 10:45 posted by ubaidullah

    i like your Power Inverter project . but i made this project its not working then i cut the 0.7v connection and i 1st Q1 E connect with resistor to other Q2 B and Q2 B Connected with Q1 E. with 9+9 Transfarmer and with 12V 4A battery . it is working with 240 watts when i connect the 25W severg Tube light it is not on. when i connect night bulp 15W it is work . what's problem? can i change Transfarmer or add more Transistor or batter ? please help me

  • Comment Link Saturday, 01 September 2012 23:47 posted by Innoson

    Sir, what will be the output wave form of this circuit

  • Comment Link Thursday, 23 August 2012 10:26 posted by harikishan

    sir this circut is not perform
    i have some mistakes please tell me
    how to work of this circuit
    i make the 100watt inverter but circuit not work

  • Comment Link yasirtanveer Saturday, 07 July 2012 13:44 posted by yasirtanveer

    sir mug ko ups ka saman mil skta hai

  • Comment Link Thursday, 05 July 2012 17:30 posted by shadrack asumadu

    i will be happy if you will guide me to do this circuit especially when recharging the battery after it has dropped

  • Comment Link Thursday, 05 July 2012 17:25 posted by shadrack asumadu

    i will be happy if you will guide me to do this circuit

  • Comment Link Tuesday, 12 June 2012 13:14 posted by Khurram-Shahzad-85

    Can i use this UPS to Power up my PC?

    And if i want to create the 1000 or 5000 watt version, i need to connect the more transistor in same manner right?

  • Comment Link Saturday, 02 June 2012 17:21 posted by rashid mehmood

    i want lear detail about 50w /100/ 500watt circuit daigram that i make them for my home which type of transformer we need here i tryed before but i fail thier is flasing light as like spark plz help me

  • Comment Link Tuesday, 22 May 2012 18:18 posted by ABDUL

    @Tajwer please recheck your connections. specially transistor to base

  • Comment Link Tuesday, 22 May 2012 14:37 posted by tajwer

    i try to make this 100 watt u.p.s but this is no work please help me to make this .u.p.s this is my project
    and second ; video is osemmm

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