How long are you parked? Both house and chassis batteries?
We often leave our coach unplugged for a month at a time during winter weather and both house and chassis batteries are fine.
Note, you should have a cut-off switch that will disconnect all house battery functions from the batteries, thus eliminating slow maintenance battery drains that will accumulate over time. Do you shut that off?
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Mike
“A government big enough to give you everything you want is a government big enough to take from you everything you have.” – President Gerald Ford
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