Used 12V RV fridge test

[Bella PSD]

also, you can't really discharge the battery down to zero amps. In reality, your battery has between 70-115 amp hours, of which approximately 50% or so are useful. So in essence, you have between 35-57.5 amp hours. That gives you about 10-18 hours or so before your battery should be recharged. 3.5 amps isn't too bad, you can get a solar panel that will replenish a large portion of that.

So that makes sense. I ran it yesterday for about 24 hours at 3.5 amps and the battery was down to 4.7 volts.

Volts____Time_____Ambiant Temp___Fridge Temp
12.5____Noon_________72______________72
12.0____12:15________72.5_____________80
11.9____2:30_________75.1_____________65.7
11.8____3:00_________76.1_____________60.8 (pulling 3.5 amps)
11.5____6:30_________78.9_____________55.4
11.5___10:00PM_______74.5_____________51.1
4.0____10:00AM_______72.5_____________54.1 Dead battery
And remember, I started with the fridge full of (28) 16 oz luke warm water bottles. Should have used BEER!

So in 22 hours it killed the battery and never cooled below 51 degrees (that I know of, did not check it over night). The 27 warm bottles of water test was a tuff one for this fridge.

I will try one one test starting with a cold fridge and a fully charged battery. Fill it up with cold water bottles, start the test, and see how well it does.

Louie

 

[Bella PSD]

I just looked up the battery.

Energizer deep cycle battery
125AH
850 Marine crank amps
675 cold crank amps
Res Cap 210 min

So "on paper" I should get 35.7 hours. (real world test, got 22 hours with 3.5 amp draw, maybe less)