Had almost the exact same thing happen with my US3000C stack last autumn — left the motorhome sitting on the drive for about three weeks while we sorted some damp issues, came back to find a 47mV...
@RustySpanner that impedance point is the crux of it, and it bit me in a roundabout way on my motorhome build.
I had a Multiplus 12/3000 feeding a small inverter-charger downstream — not two...
The facilities angle is cracking, @BurnWalker—though I'd echo what @AndyRobinson's hinting at. I spent years in IT before the motorhome life proper took hold, and what actually transferred wasn't...
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