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...
You can run a month or so on propane with the fridge. Issue is 12 v power for the controls
You house batterys should be evenly matched.. If there is no AH rating and just RC then they are not true deep cycle and are marine starting batterys..