I bought a cheap solar panel that plugs into the 12VDC accessory socket (a. k. a cigarette lighter) and it does a "fair" job of dealing with parasitic draws. It's a very common issue with Sprinter-based motorhomes (even Winnebago) and some owners install an aftermarket trickle charger and some use it as an excuse to take the rig for a drive!
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Ed & Robin Lively
with Nina, Kitt, and Mickey
2016 Thor Synergy TT24 (a.k.a "Ming")
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