Hell, just get a group 29 or even larger house battery and don't worry about charging it until you get home. I have a 82#, 24V trolling motor on the flats boat and I can fish two days without noticable loss of power. Group 27 deep cycles from Wal-Mart.
LED's. If I recall, your only house load is lighting... unless you leave the electronics powered up. Maybe consider one of those little Honda generators.