OK, here's the house battery, also an AC Delco. It's about 10 x 7 x 9. Reserve capacity is 108. I believe the higher the Rc the better (experts step in here). Have dry camped at a local music festival that doesn't allow generators and it's lasted four days with ease. If I was off grid for a week or more I would think of adding capacity but this one's doing fine so far.
Cliff