While the problem description is long the fix is easy. Just move the plus converter charge lead to the battery side of the use/store isolation relay.
For us it doesn't matter as there is no indication of which position the use/store is in and the solar always charges the house batteries unless the solar system breakers are off.
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2016 Axis 24.1 E-450 6 spd tranny
300 watts portable solar.
200 watts solar on the roof.
Wrangler JK dinghy
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