[ilyt]

It's definitely "just buy one", if you just want an inverter.

It is nonetheless interesting if you want to build it as component of something more complex, say DIYing a battery bank out of some recycled cells

I wonder how many changes would be required to run the whole thing on say 24 or 48V. At glance just powering the board with 12V source and just feeding more to MOSFETS seems to be enough