a994 Carver 390 CPMY. Battery dedicated to the generator, and 2 others on the MBSS. Just 12v deep cycle batteries. I had a REAL house bank on my last boat, which consisted of 4 6V golf cart batteries on 1 position of the switch, and a starting battery on the other position. With the limited space I have, I was wondering if a house bank of 2 6V GC batteries, hooked up to be a 12, would fit where the batteries are now? Or would it be a better idea of using a couple of 4 D's, and keeping the dedicated generator battery. I used to stay on the hook and the GC batteries would runt the fridge for over 48 hours. I am unsure how long my fridge would run on this single 12V battery that came from the factory even if I ran the genny an hour in the AM and same at night. What has others with this type boat done for a real house bank?