Hey Doug, sorry for the late reply.

Batteries are actually an unsolved problem for me. Currently the boat has two identical dual purpose FLA batteries that are physically on the small side (car battery form factor, 2 of them fit into the battery box), but labeled as 140 Ah each. Based on testing and common sense, this seems ridiculous. In my research I haven't been able to find anything close to that capacity in such a compact form factor. The current ones do need replacing though - even after full charging cycles they're putting out 12.06 V each :-/

I'm looking at doing a split house/engine battery, with a 200+ Ah deep cycle for the house and a separate starting battery. I have an ACR for combined charging when running the engine and isolation during normal operation. I also installed individual battery switches so I can run the entire boat off of either battery individually if needed.