I keep our Challenger (50 Amp) in a covered storage yard with access to a 15 Amp circuit for the purpose of maintaining batteries only. I use two adapters to plug in the coach (50 to 30 and 30 to 15). I leave the Use/Store switch in the Use position and turn off all electrical loads, including A/C, refrigerator and all lights. Haven’t had any problems except for one time when I forget to turn off the A/C. That tripped the storage yard’s breaker and I returned to dead batteries.
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