[sastanley]

I know everyone does their own thing, but I cannot for the life of me see a reason to keep a 30 amp shore power plug connected to the boat 365/24/7.

I have a 5w solar panel that keeps my start battery at 100% every time I come to the boat, and 30w solar panel that keeps my 230 AH house bank at 100% every time I come to the boat. I don't even take the batteries home in winter anymore, as the sun at 38° Latitude is still plenty to keep them up all winter.
I understand a fridge and stuff (which I don't have, but put adequate solar to run that at the dock.) When you are on board and want A/C, plug the boat in. I have neither, although A/C is MUCH higher on the list than a fridge with these newer tech coolers.