For a 3 phase system, is it possible to setup 3 standalone unit where each unit consists of 1 x multiplus and 20kwh battery and connect 3 of such unit together at the AC out side.
You want to run a three phase set up with a grid connection to a three phase set up?
Alot of how safe both inverter set ups are will depend on how you program them.
It is officially unsupported, but people do it anyway.
You can, but monitoring and controlling with one gx will be a challenge or impossible
Why not setup as a 3 phase system?