I was operating under the assumption that the system would be wired into the boat/car's existing electrical system, which in most cases will use one or more lea

I was operating under the assumption that the system would be wired into the boat/car's existing electrical system, which in most cases will use one or more lead-acid batteries. Edit: a vanlifer showed up and informed me that Lithium conversions are a thing. Turns out you can have your Lithium and eat it too. Cool stuff.