Hi.
The idea was to create stronger version of this:
http://www.instructables.com/id/250-to-5000-watts-PWM-DCAC-220V-Power-Inverter/
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1.) How to change this design to 72V input

2.) If i look at the data table that is presented on the web page,
4500W should be reachable with 72V. This is too small for me.
I need to get 8kw at 72V input (i have battery bank 72V-135Ah)

http://www.instructables.com/id/250-to-5000-watts-PWM-DCAC-220V-Power-Inverter/

Can someone help with redesign ?

 

You would need to up the power stage in the "box" with a higher Mosfet stage like this,

your transformer would have to be wound for 72V to 230V instead of the 12v to 230v.

[ for some reason its cropped the bottom of the drawing, the bottom is a mirror image of the top half]