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

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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 Monday, 29 September 2014 07:56 posted by abdullah

    which type of transistor ?
    NPN or PNP ?

  • Comment Link Friday, 19 September 2014 07:02 posted by NGANG

    Is this a dine wave or modified sine wave inverter.
    can you please design a transformerless inverter. that is using but ferrite core

  • Comment Link Monday, 04 August 2014 17:15 posted by RAJASEKHAR

    Assalam Aliekum.Assalam Aliekum.

    hi excellent performance sir,

    We are final year students of Electrical Engineering.
    We want to make a 220 V (rms) inverter that has the DC input of 310 V.
    Can you help us in designing this circuit?

  • Comment Link Monday, 04 August 2014 17:13 posted by RAJASEKHAR

    hi excellent performance

  • Comment Link Thursday, 12 June 2014 19:14 posted by sameer

    thank u so much

  • Comment Link Sunday, 01 June 2014 01:46 posted by basharat

    sir ge raly conaction samja dein please

  • Comment Link Sunday, 01 June 2014 01:25 posted by basharat

    sir ralay kasy lagani ha us ka bary main please 220v 4/4 pin conaction samja dein
    DIY upload please

  • Comment Link Friday, 30 May 2014 07:18 posted by Mumtaz

    My UPS Charger 12 is working and charging the 120 AH Batteries. But Inverter is not switching ON. Plz guide.

  • Comment Link Saturday, 12 April 2014 10:23 posted by Ali Junaid

    Assalam Aliekum.
    We are final year students of Electrical Engineering.
    We want to make a 220 V (rms) inverter that has the DC input of 310 V.
    Can you help us in designing this circuit?

  • Comment Link Wednesday, 09 April 2014 15:10 posted by M.Sohail

    a.o.a friend i make a 500 watt UPS if i will use a transformer 40 amps (500 watt) 220 v, (12*12) so can i connect 90-100 amps battery with this transformer?

    plz reply me fastly

  • Comment Link Monday, 07 April 2014 11:12 posted by asad

    what would be the frequency of the output>? how can the frequency be controlled ??

  • Comment Link ABDUL Sunday, 23 February 2014 12:16 posted by ABDUL

    @Thomas V. talmadge
    Thanks you.
    the power rating of resistor should be less than 1 watt, for making of perfect inverter transformer please see this video ( http://www.paksc.org/video/diy-project/36-make-your-own-homemade-diy-electric-transformer )
    feel free to ask any query about it.

  • Comment Link Saturday, 22 February 2014 09:00 posted by Thomas V. talmadge

    Please if I may ask, what is the power rating of the 500 ohms resistor? would 5 watts rating be sufficient?
    I have a 500 watts 220/110 volts step down transformer that I intend to modify . How many turn do I have to make on the secondary winding to produce 12-0-12 and 0.7-0-0.7 volt for the circuit requirement of the 500 watts for the power inverter UPS. I will gratefully appreciate your help and advice on these query. Thank you and more power to you all,

  • Comment Link ABDUL Tuesday, 11 February 2014 18:08 posted by ABDUL

    @Engr Godwin
    yes this circuit work very well...

    @uzair baloch
    same capacitor can use for 1000 watt inverter

  • Comment Link ABDUL Tuesday, 11 February 2014 18:05 posted by ABDUL

    @Engr Godwin
    yes this circuit work very well...

  • Comment Link Monday, 10 February 2014 07:49 posted by Engr Godwin

    psc,please does the circuit work?

  • Comment Link Wednesday, 30 October 2013 06:57 posted by HARI KRISHNAN

    pls i want simple circuits... this circuits i not understand sir

  • Comment Link Friday, 03 May 2013 14:52 posted by uzair baloch

    dear admin please tell me if i want to design 1000w then what will be the circuit diagram i mean the connection of transistor's will be as per and which capacitor should use.....please reply

  • Comment Link Thursday, 25 April 2013 15:13 posted by MD MODASSIR KHAN

    you con help me pl z......

  • Comment Link Thursday, 25 April 2013 15:10 posted by magdy bendary

    very good work thank u


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