Originally Posted by ErnieSeabee
I have a 2022 forester 4201 MBS. magic chef refrigerator. With everything off, except the refrigerator ( cool setting 2) the cabin batteries only last about 5-6 hours and drop from 13 to 12 Volts.
Any thoughts how to extend the battery life. Dealer said the batteries all check out and no other abnormal sacrificial draws.
"Battery Life" will depend on a lot of factors. First will be the size of the batteries (amp hour capacity). Next is the amount of current drawn by appliances, in your case the refrigerator). Also important is the ambient temperature and the number of times the refrigerator is opened.
Since your RV is a new(er) one I'm guessing that the batteries are low capacity items installed by the dealer and really aren't suited to running a 12v refrigerator.
One thing that will help, regardless of battery size/type, will be a battery monitor that uses a shunt to measure current going into and out of the batteries. The OE monitor installed at the factory is usually just a series of LED's that measure only voltage. Does a lousy job of telling one when the batteries are fully charged and don't measure any draw on the batteries.
A shunt type battery monitor, properly set up, will monitor power drawn from the batteries and power replaced during charging. It can also help manage use
It sounds like you have a residential type refrigerator that has a compressor. This type refrigerator draws more power then the old school propane/120vac type. Solution to your problem may well be to add batteries, whether it's more like what you have in parallel, changing to a series/parallel setup using Golf Cart like batteries (6 volt batteries in series), or Lithium batteries that provide more usable power in the same size battery.