Forgot to mention that even in the smallest and most basic camper RVs there are some battery loads that you cannot turn off, like the CO2 detectors used in some models. If your detector does not have its own separate disposable battery, it runs off the system 12 volt battery.
Even without separate non-switchable loads, the self discharge of a battery means it should be disconnected and stored with occasional charge cycles in the off season. Some outdoor storage scenarios allow for solar chargers to be used for this 'topping' function -- but under a few feet of snow this is not a good alternative.
Chuck
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2007 Tour Master T40C
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