Good question and I do not know the answer. One would hope that it writes it to some solid state memory, but nothing would surprise me.
I never completely de-power the bus. It sits at home, and even in winter it sits no more than 4-6 weeks. In that case I do disconnect shore power but I put battery minders on there.
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2020 RAM 3500 DRW Long Horn. In the hunt for a Palomino TC, formerly a 2017 Berkshire 38A: https://dragonship.blog/