Running refrigerator on house battery, How long?

cooldavidt wrote:
Depends if you are in Iowa in November or Florida in July.
But you should be OK if you drive the vehicle daily.

If you had TWO 6V golf cart batteries (one marine/RV dual purpose 12V battery will not make it) and a modern highly efficient refrigerator and a good pure sine wave inverter, I would concur. Also "overnight" implies at least 8 hours of no one opening the door !

Remember, most vehicle charging system will NOT properly fully recharge house batteries without a DC-DC charger.

What kind of a refrigerator--compressor-based residential refrigerator, or RV absorption refrigerator? What size and type of battery?

The RV absoprtion fridge in propane mode will easily last through the night with most any battery you'd be likely to use, needing maybe 10 Ah, give or take. A residential fridge uses a lot more electricity than the RV fridge in propane mode.

We don't know what the current draw is on that fridge and we don't know what type of battery you have, or what condition it is in.

Depends if you are in Iowa in November or Florida in July.
But you should be OK if you drive the vehicle daily.