Well, I guess I am undergoing a similar evolution right now installing a whole house inverter for the first time. I posted my wiring plan in a new topic.
I think as Bill K said most modern inverter/chargers have isolated grounds. The unit I selected (MagnaSine 4124, had an optional "system ground jumper" that had to be disconnected to keep the inverter AC neutral separate from the chassis ground/earth/bond, but otherwise had no connections with the current carrying lines and earth.
SV Annie SM 37