Inverter/Battery needs for Residential refrige

what size, type, and how many batteries? What is the run time?

25 amps per hour while running.

4 deep cycle, and solar. It's not 'amps per hour', it's just amps.

philh wrote:
what size, type, and how many batteries? What is the run time?

25 amps per hour while running.

Currently have 2 automotive batteries, not sure of size. That was my question, what size (amp- hour) would I need.Undrstand the 2.5 amps per hour, but refrige doesn't run continuously.

Or better four 6V golf cart batteries in series parallel setup.

Don’t skimp on solar watts and add in your other power items...heater, TV, water pump etc...in your amp hour needs. 1.5 watts per battery amp hour IMO.

If you never open the door of your refrigerator, it will normally run 16-18 hours per day with normal room temperatures of 75 degrees. Does your replacement have automatic defrost? If so, what is the amperage of the heating element? How long the heater is energized will depend on how much frost builds up each day.

That is a pretty crappy fridge if it is running 65-75% of the time.
I would be replacing it asap.

Romer1 wrote:

philh wrote:
what size, type, and how many batteries? What is the run time?

25 amps per hour while running.

Currently have 2 automotive batteries, not sure of size. That was my question, what size (amp- hour) would I need.Undrstand the 2.5 amps per hour, but refrige doesn't run continuously.

2 automotive batteries?

Yeah, that isn't going to cut it..

Group 24 RV marine battery tops out around 70 Ahr and at 50% capacity to save battery life is only 35 Ahr.

Contrast that to the basic 6V GC2 golf cart batteries, they will typically have 210Ahr-230Ahr and 50% of that is 105Ahr-115Ahr of capacity. They will hold up better to long deep discharging than starting batteries.

Good low cost source for GC2 batteries is Sam's Club or Cosco..

If using a "starting battery" for a car, that is a no go, those batteries will not hold up to long, deep draw down and will be toast quickly.

I use just one pair of 6V GC batteries for my home fridge conversion and am able to get 24 hrs before needing to recharge. We typically overnight without power and travel through the daytime and mostly camp at places with shore power.

IF you are planning to boondock for several days at a time, two pairs of GC batteries would be my suggestion from my experiences.

You could also add in some solar to help assist during daylight hrs which would cut down on the charging times using a generator.

The bigger the battery bank the better. Unfortunately most RVs have very little ventilated space for batteries. You are lucky if you have room for 2 X 6V, 2 X grp 24 12V or a single 4D battery.

Getting around this problem involves getting into the marine world a little & changing to non venting batteries. In cruising boats it is very common to find batteries right underneath berths. What makes them safe is that they are non venting sealed AGM or Gel type batteries. These types can be put anywhere there is space in your unit. The limiting factor, besides weight, is cable length & VD.

2oldman wrote:
4 deep cycle, and solar.

Concur ! In my book, "deep cycle" means 6V golf cart batteries. 4 GC2 batteries (2 in series and those in parallel with the other 2 in series). That will give you OVER 400 Ah @ 12V.

6V AGM golf cart batteries are available (Trojan T105-AGM), but they are expensive. You would have to order them through a golf cart store or a solar power store.