Need Some help with my battery system
Last fall we purchased a used toy hauler with an onboard Onan 5500. It also has a residential fridge. We had the dealer install two golf cart batteries in place of the 12-volt batteries. The tech guy ...
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1. Disconnect switches usually leave a few parasitics connected (like LP detector and maybe some other sensors). Neither disconnect, nor physically disconnecting, will solve the self-discharge issue (5-10% per month on FLA)
2. Agree with others that with a residential fridge: 2 FLA batteries should be minimum for campground to campground camping; 4 FLA batteries, preferably GC, is minimum if you want to do an overnight without external power; equivalent of 6 FLA batteries (600AHr) is minimum if you want to dry camp much and have a larger inverter to run other things.
We have a residential fridge and I’ve measured it several times: it draws ~160AHr over a 24hr period. That would suck two std Interstage 85AHr batteries dry in a day, and barely make 12hrs between external power without dropping below 50% SOC
2. Agree with others that with a residential fridge: 2 FLA batteries should be minimum for campground to campground camping; 4 FLA batteries, preferably GC, is minimum if you want to do an overnight without external power; equivalent of 6 FLA batteries (600AHr) is minimum if you want to dry camp much and have a larger inverter to run other things.
We have a residential fridge and I’ve measured it several times: it draws ~160AHr over a 24hr period. That would suck two std Interstage 85AHr batteries dry in a day, and barely make 12hrs between external power without dropping below 50% SOC
