Leaderboard

If you can find the space for them, the biggest bang for your buck in 'house' batteries is a pair of 6 volt golf cart batteries wired in series for 12 volts. They will provide about 200 amp hours and conservatively discharging them to 50% gives you 100 amp hours of 'usable' power - That would power your ice maker for several hours and would probably run your ventilation fan for a week or more. They do make AGM golf cart batteries which contain no liquid acid and are not vented, but they are expensive. You can mount them anywhere you can find a suitable nook though because you never have to check the water level in them. I've used golf cart batteries and other 6 volt batteries (primarily L-16's, which are 'double' golf cart sized) in sailboats for many years and they are an excellent power source for inverters when the engine isn't running. I have a 750 watt inverter in my TC which is powered off the engine battery, but I did replace the small starting battery with a larger AGM battery Don