theres a guy at my yacht club that purchased a brand new catamaran with 2 electric powered motor for propulsion in and out of the harbour. lets jsut say after 2 year i never seen anyone rip something out so quick. It may look good on paper but when it comes together you might have some issues. I would defiantly look at one of those new inverter generators that creaats enough power to run the electric motor because it will never charge your battery bank quick enough. have it run so you can switch it from charge to direct power. you can actually moun them in your engine compartment and weld up an exhaust to vent it. If your looking for wire. Consider using welding wire. It comes in every size and is pure copper.