My boat came with one of these and I'm struggling to work out if I should keep it or replace it. From what I can tell from internet searches it's designed to allow you to sell power you've generated back to the grid. Our boat has no solar so this seems pointless. It does run the 230v sockets we have on board, and I suppose it would automatically switch and charge the batteries if we were ever on shore power, but it seems to me to be overly-complex, difficult to understand, and it's very big and extremely heavy.
Does anyone here use one of these on a boat? Would I be better (as a non-expert) to just junk it and get something more simple?