The battery should be a combo startingdeep cycle battery usually sold as a marine battery. Example of a draft wiring diagram for a simple boat.

Boat Battery Charging Diagrams C3 Wiring Diagram
Boat inverter wiring diagram. This way even if your battery switch is off if your boat starts filling with water the pump will still kick on. Collection of boat inverter wiring diagram. Its pretty standard in boat wiring to bypass the main battery switch for one thing. The boats bilge pump float switch. Marine inverter charger wiring diagram wiring diagram for inverter charger fresh boat inverter wiring diagram awesome filesecondary cell diagram svg. My main panel is identical to the wiring diagram you show with the double ac and i also have the generator below the main circuit breakers.
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An ordinary auto battery would do for starting and lights but for running a radio and other electronics something with a little more of a deep cycle capacity will be needed so the battery doesnt go flat while youre fishing and listening to the radio and leave you stranded when you try to. Equipment coming off a switchboard or circuit panel should be straightforward to trace. I struggled to find this information online so as i was wiring up my campervan i decided to put a video together of how i wired it up and what methods and parts i used. Marine grade wiring https. It reveals the parts of the circuit as simplified shapes as well as the power and also signal connections between the tools. Campervanrv electrical system explained battery bank wire gauge inverter solar.
Id rather have a dead battery than a swamped boat. We installed a 30 amp breaker marked inverter on the right side of the panel to take the light loads such as receptacles and other small things.