simple 3 phase AC inverter from 120VDc . 12 volt supply is also available.
hardware Arduino Atmega328p.
IGBT can be selected any but if possible use
simple two speed one at 25HZ and other at 50Hz
no display needed .
i already have sample code and video available of that working code .can also help in designing PCB .
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I have to knowledge of inverters and I will give you the optimised design. You can trust me because I have spent my last year on inverters of 12VdC to 220VAC
I have an 4 years experience in arduino. And also I did many industrial projects same as your project. I have the knowledge what you are looking for Ping me for more information Thanks