Nicholson58 & Ike & all the rest of you who have engaged in this electrifying discussion:
I think we are coming together. Nicholson58 has it right, in my opinion, by establishing his own "ground" aboard, and keeping disconnected from "the battery
Ike's solution to stay away from AC altogether is the safest way to go, but I think one can have the convenience of higher voltage AC systems (smaller wires, readily available appliances) as long as one does not get connected to the rest of "the battery
," or anything else. Especially the water.