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...
He'll run out of 12V before he'll run out of propane.
My semi-wild guess for a SINGLE starter battery would be - a few days max. Assuming only the fridge is running, no other loads, and assuming he doesn't want to deplete the battery below 40-50%.
The one that is actually a starter battery for a motor, should not be used for anything else, yes.
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