I camp with a motorcycle pulling a tent trailer. I also need a battery powered CPAP (sleep apnea pump) at night. My motorcycle has a 18 amp-hour battery, I installed a 35 amp-hour battery in my trailer to run the pump.
While traveling, the bike charges the trailer battery, but what happens when I stop for several nights in a row? I disconnect the trailer and ride the bike around during the day.
I have drained the 35 ah battery in about 3 1/2 nights while parked. I understand charging voltage but I don’t have a good grasp of the amp-hour situation. If I connect the two batteries directly to each other while parked, will I gain amps transfer so I can run my pump w/o having the bike motor running to charge the trailer battery? I don’t want to drain the bike battery so I can’t start it.
Grateful for any insight or useful suggestions. Thanks in advance.