Simplest 12V to 220V DC to AC Power Inverter DIY





Introduction: Simplest 12V to 220V DC to AC Power Inverter DIY


In this instructable, you will learn to make a simple but powerful inverter at home.This inverter does not requires multiple electronic components but a single component which is a relay.The relay alone is responsible for performing the switching action which in terns, converts the DC from a battery into an AC voltage.

This type of inverter is a square wave inverter and is good for school or collage projects.

List of components required for the project:-

  1. 12 volt battery
  2. Some wires
  3. A 5 terminal relay
  4. a transformer single phase
  5. a load bulb

That's it!

Step 1: Transformer & Relay

--> You will need a 12 volts to 220 volts transformer.

--> A 12 volt relay and the wiring of the relay should be exactly as shown in the picture.

One of the terminals of the relay will remain disconnected from the entire circuit since its not required in the project which means that only 4 terminals of the relay will be responsible for connecting the Transformer and the battery together.

Watch Full Video

Step 2: Circuit Details:

The tripping coil terminals of the relay will be connected to the low voltage 12V winding of the transformer as shown in the picture.The load will be connected to the primary high voltage winding of the transformer 220V.

After doing that the "mains disconnect terminal" of the relay will be connected in series with the battery and the other terminal of the battery will be connected to one of the secondary terminal of the transformer.

"Project Collection"

Step 3: Testing the Circuit:

After doing all the connections as instructed, the bulb should start glowing brightly.

The maximum power of this inverter depends on the size of the transformer and the input power supply.

The frequency of this circuit is around 60 to 70Hz and the efficiency of this circuit is around 63%

So guys that is all for this project.


Watch Full Step by Step video --> Full Video

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Please be positive and constructive.



I have connected the 12v battery the transformer relay and the Bulb but it Is just blinking what can be the problem


Can you send the Circuit diagram

all the necessary details have been provided in the video.Please don't forget to watch it.

i have other delay

can u recommend me some plz?

the relay i have used is from a ups inverter.

Perhaps a voltage clamp and R-C combo on the primary would assist in reducing arcs on the contacts and high voltage spikes. Otherwise used in 1920s to 50's on car radios.

Car radios used a hefty, specifically designed and dedicated MECHANICAL VIBRATOR SWITCH similar to the model T Ford SPARK COIL. As I recall, upon disassembly it looked much like a heavy duty double pole reed switch.

That certainly is a simple inverter, and could be useful for many applications. My concern, as someone else already pointed out, would be in the longevity of the relay contacts. If you could make it work with a solid state relay it might hold up a lot longer, only problem is I think most solid state relays require the zero crossing of the ac sine wave to turn off. By the way, I'll not mention any names, but someone here likes to blow a lot of smoke, and hasn't a clue what he's talking about! LOL Nice ible, thanks for posting it.

put a cap across the contacts and it will absorb the spikes which usually arc across and burn the contacts

I hate to spoil your fun ( I do understand the adventure of experimenting), but you can run incandescent light bulbs directly off the 12v battery. Buy choosing different wattage bulbs (different resistance) the bulbs will burn at different brightness.