Homemade 2000 VA Power Inverter Circuit

Making a power inverter circuit rated above 2000 VA is always difficult, mainly because of the involved transformer dimension which becomes quite huge, unmanageable and difficult to configure correctly.

Power inverters in the range of KVA, requires huge current transferring capabilities for implementing the required operations as per the desired specs of the unit.

Transformer being the main power making component of such an inverter, requires high current handling secondary winding if the used battery voltage is at the lower side, for example 12 or 24 volts.

In order to optimize the transformer at lower currents, the voltage needs to be pushed at higher levels which again becomes a problematic issue, because higher voltage means putting batteries in series.

The above problems can definitely demoralize any new electronic hobbyists or anybody who might be planning to make a rather big inverter design, may be for controlling the whole house electrical.

An innovative approach for make things simpler even with huge power inverter designs has been discussed in this article which uses smaller discrete transformers with individual drivers for implementing a 2000 VA inverter circuit.

Let's study the circuit diagram and it's operations with the following points:

Basically the idea is to divide the power into many different smaller transformers whose outputs can be fed to individual sockets for operating the relevant electrical appliances.

This method helps us to avoid the need of hefty and complicated transformers, and the proposed design becomes feasible even for an electronic novice to understand and construct.

Four IC4049s have been employed in this design. A single 4049 consists of 6 NOT gates or inverters, so in all 24 of them have been used here.

Two of gates are wired up for generating the basic required square wave pulses and the rest of the gates are simply held as buffers for driving the next relevant stages.

Each transformer utilizes a couple of gates and the respective high current Darlington transistors which function as the driver transistors. The associated gates conduct alternately and drive the transistors in accordance.

The mosfets which are connected to the driver transistors respond to the above high current signals and start pumping the battery voltage directly into the winding of the respective transformers.

Due to this an induced high voltage AC starts flowing through the complementary output winding of all the involved transformers, generating the required AC 220 V or 120 V at the respective outputs.

These voltage become available in small pockets, so only the relevant magnitude of power can be expected from each of the transformers.

The 555 section takes care of the square wave output generated from the oscillator stage such that these are broken into sections and optimized for replicating a modified sine wave output.

All the parts after POINT X should be repeated for acquiring discrete power output sections, the common input of all these stages must be joined to POINT X.

Each of the transformer may be rated at 200 VA, so together, 11 stages (after pointX) would provide roughly outputs up to 2000 VA.


Though using many transformers instead of a single might look like a small drawback, the actual need of deriving 2000 VA using ordinary parts and concepts finally becomes achievable from the above design very easily.

How to Make a Homemade 2000 VA Power Inverter Circuit


29 thoughts on “Homemade 2000 VA Power Inverter Circuit

  1. Have questions? Please feel free to post them through comments! Comments will be moderated and solved ASAP.
    • The stage after the pointX which consists of two gates, two transistors, two mosfets, resistors and the transformer may be repeated many number of times (11 times here).
      The input to all these stages will be pointX.
      The output from each of the transformers can be separately terminated to individual sockets for getting the relevant magnitude of power outputs.

      Regards.

  2. swagatam,
    why is my 2000VA automatic voltage regulator not producing output voltage and why is it burning the 35v 1000uf capacitor.also i noticed humming on the transformer.i need to know the causes and the solutions
    thanks.
    stintex2001@yahoo.com

  3. hello sir,
    how r u.thanks for giving us ur valuable time
    sir i am trying to make ur above stated circuit but i m not getting the desired output. i had made the circuit exactly u had described.for testing purpose i had used 12-0-12 5v step down (reversed) trafo. but it is giving 180v output with a humming sound and my mosfet are getting extemlly hot within 10sec. battery i had used is 12v 9.4ah.
    it has taken the life of one of my 4049ic. the same trafo is giving the good out put with ur suggested 50w simple inverter circuit. please help me to get out of this problem.
    thanks for ur kind support

    • Helo Avijeet,

      connect the mosfet gates directly with the IC gates via 1K resistors, don't use the transistors.

      For getting higher voltages use 9-0-9V transformer.

  4. hello sir ,
    thanks for your quick reply
    i had made the changes and now it is better than before. since i had no 9-0-9 so i m not getting the out put near 220v.
    –>by the way u had suggested 9-0-9 for step down trafo or it is also suggested for step up trafo for getting high output.
    ->one more thing can back emf of trafo through +ve rail gives any harm on ic.
    thanks for ur great circuits and ur valuable help

    • 9-0-9 is the mosfet side winding and 220V is the output winding of the transformer, you may use any ordinary 9-0-9/5amp transformer for this.

      emf will not have any effect on the IC.

  5. Dear sir
    I want a charging lite I have 3w led 30 at 6 v 4.5amp dc with good britnece so if you any circuits schematic so give me I will wait



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