residential refrigerator, how long will it run on batteries?

I have 2 Wally world deep cycle 12 volts. Always use the inverter when traveling To keep fridge cold. I have tested it sitting in driveway 85 degree temps without opening door. Can go 3 days no problem batteries only drawn down about 30 percent. but there are so many variables.

I had unplugged my RV to moved it and forgot to plug it back in. Went 4 days no problem. Course it was just sitting I wasn't opening and closing the refrig doors. But batteries were hardly down much at all. When were traveling many times we don't run the generator and haven't had a problem. Yes I have the Samsung. Took out the Norcold and installed the Samsung. Best mod I ever did. Won't buy another rig without a residential style unless it's a REAL good $ and I can swap it to residential fairly easy.

barnaclebill wrote:
I did several searches and didn't find an answer. I have a samsung residential refer in a new to us coach. It has 4 6 volt interstate U2200 batteries. After getting it cold on shore power and stocking it approximately how long will it run till the batts are about 50% discharged?

Should go a whole night without a problem and especially without the door being opened repeatedly.

There are a lot of variables.

The EPA energy guide numbers might be a reasonable starting point. Typical for fridges these days are around a kWh per day, maybe a little less for comparatively small fridges, particularly those without ice makers and in-door water dispensers. Very little dorm fridges often use pretty nearly as much energy as smallish full-sized fridges.

Your battery bank is about 450 Ah at 12V, or 5.4 kWh, and about half that is all that ought to be used for the batteries to last well. Two days of use would not be unreasonable as a very rough guess assuming there's nothing much else consuming power at the same time. Obviously it's far more accurate to measure your actual usage and work from there.

too many variables...total amp hours, condition and state of charge of your batteries; how often the compressor must run to maintain the set temps; what else is drawing power from the batteries. ours has run overnight while parked at home with nothing else drawing power.

They discuss all types.

Maybe this newer post will help.

January

Plug the fridge into a kill-a-watt meter for 24 hours. Use normally during the time frame.

A 100 amp-hour battery is about 1300 watt-hours, only 50% ought to be used.

2oldman wrote:
household refer and inverter2009
Household refer Class A 2009
residential fridge- boondocking 09

Thanks, Looked at those post before, they discuss small 110v refers but not large residential refers like a samsung 3 door 18 cu. ft.