lingering electrical question...

[JPz]

I have had various 5th wheels over the years and never had understood exactly how to put the coach away for the winter as far as the batteries/electrical system. First off, can it be plugged into shore power for extended periods (maybe 2 or 3 months) without damaging the batteries? I have a new 2021 Montana High Country 334BH, since this is a newer coach it comes with a battery disconnect switch. If I put it away for the winter, do I take the disconnect key out, and leave it plugged in? Do I disconnect the negative side of the batter?

I also have factory installed solar power. Is there anything I need to do here to pack it away for the winter?

Sorry to be on the dummer side of this but the Montana manual that comes with the trailer is so generic and does not relate very well to what I have. Basically looking for a procedure to follow so my batteries don't turn to junk in a few months.

Thanks in advance