The USE/STORE (master power) relay simply connects the house battery bank with the 12 volt fuse panel in the power center. If you want to USE battery power, the relay must be in the USE position. If you want to USE the coach's charger to charge the house battery bank, the relay must be in the USE position. The only time to put the relay in the in the STORE position is when coach is stored WITHOUT shore power or generator power. Even then there is some current draw from the house batteries for devices no fused by the power center.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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