Originally Posted by Schade2730
Itís an residential refrigerator only runs on electricity. I have 2 batteries not sure of load rating. They are brand new.
If it really is a residential fridge, meaning it runs on 110V AC and not DC like most RV fridges, then you have to run it on an inverter which converts DC to AC when not connected to shore power.
Those fridges are not very efficient and it can take 100+ amp hours of DC input to the inverter to run it for a day. You probably have two Group 27 batteries which can produce about 75 amp hours each, so a total of 150 amp hours. But since you don't want to routinely draw down lead acid batteries more than 50% for best life, that means you can only run the frdge about 18 hours on your batteries.
If your fridge runs on 12V DC directly then you can probably go a bit more than a day on your batteries.
Of course in both cases you will have parasitic loads as well as normal loads like lights, device charging, etc that can add 20-30 amp hours daily.