Hi Tigercat,
There should be a separate DC breaker for the fridg. If it was dealer added they may not have tagged it on the panel. I'd turn off the AC and be sure the fridge runs and then start turning off the unlabeled DC accessory breakers. I think it will run your battery down in no time. But, the new ones may be different. Turn off your engine batteries and see how long it runs on the house battery.
Got the boat up from Yorktown 12/18. No, haven't done squat. Cold as crap and 5" snow on the ground. Got my $600 worth of Yami parts to do stats, pumps, PRV, fuel filters, and plugs. Parts are still in the garage. Boat's right outside my kichen door so if we get a break in the flippin' weather I can get on it. Don't see that happening anytime soon. Does your boat have 150's on it? Did you get it from Crockett's? That was a real beaut! I couldn't pull the trigger on it because I hadn't sold my other boat. I lost 3-Tigercat's waiting to sell my boat and had to settle for the worst one on my short list. This one's been sitting for a while and I got air in the steering and air in the TT system. Everything is a bit rough. I'm going to need all the Tigercat guys here to help me get through this; I got a project. Please keep an eye on the forum.