I replaced our original Norcold 7.5 cu ft fridge with a Haier 10 cu ft residential fridge a couple of years ago. It fit almost perfectly into the existing opening, requiring just some minor trim work to finish it off. I installed a couple of double hung window latches to secure the doors while underway. I haven't tried to see how long it'll run on our two battery inverter setup, but we only ran the generator for a couple of hours each day while boondocking for a week with no fridge problems. With about 12,000 miles of travel with the Haier in place so far, we haven't seen any reliability issues. The only other mod I made to it besides the door latches was to repurpose one of the wire shelves from the old freezer section to fit into the new freezer section. The temperatures are more stable than the old fridge, there's more storage space, it's frost free, and it cost a lot less than a new RV fridge. What's not to like? ;)