I will try making a high wattage inverter. I am thinking of using a thyristor bridge or mos transistor bridge.

By calculations, the thyristors should be able to handle 12W of power dissipation. The transistors 20W. Is that possible?

I am thinking of passing 20 ampers through the thyristors or transistors. The power supply will be a 12V panel.

 

Looks too.good.to.be possible. I will use an MCU to.generate the sin signal. I will put a capacitor on the the DAC output.

 

Consider that in real life, if you can get 90% efficiency you will be doing well. Especially with only a 12V supply. So you will be dissipating at least 25W. This requires good heatsinks and a cooling fan. Handling 20A or greater currents is not easy and requires good design - thick copper conductors. PCB tracks are normally not good enough.

A high wattage inverter is not an easy thing to design. With a 12V supply, 250W is about the maximum possible due to current values, size of conductors, voltage drops, etc.

 

I know its not easy. Normally the inverters I know with bridge circuits are high frequency or for motors. I just want to know is it possible? I don't consider the step up transformer as a load to be much different than a motor.

The mos transistors with a proper cooler can handle 20-30W dissipation?

I just don't know is it practical? Normally its 10A per square mm for the cable.