rv refrigerator

joe0508 wrote:
I have two house batteries that one has 975 cranking amps and the other has 675 cranking amps and my starting battery that has 900 cranking amps.Only one has the reserve on it and it says 135.how long can i run my refrigerator on these batteries?I cannot turn my disconnects off becouse the frig goes off even though its on gas.Will i get up in the morning with dead batteries?

"cranking amps" is a totally worthless term when evaluating how long a low draw item will be able to operate.

Typically STARTING type batteries will have "cranking amps" or "CCA (Cold Cranking Amps)". Staring batteries are a poor choice for low draw items.

The item you need to find out is Ahr (Amp Hr) rate and even that is a bit hard to figure out since it can be at a 5A rate or 20A rate, starting batteries generally will not have a Ahr rate listed.

If I was to hazard a guess, your current starting batteries should be able to supply your fridge (and fridge only) for a few days to a week. But due to other items in your rig which draw power even when turned off it will be less than a week.

Best bet is to try it in your driveway and see how long it can work..

I would caution you, if you are camping in the wilderness, you do not want to use your main STARTING battery, PERIOD. Drawing your starting battery down too far will result in you WALKING HOME.