i don't know for sure about your coach, but mine doesn't NOT automatically switch between use/store. While in store, the batteries do NOT charge whether running your generator or hooked to shore power.
The only time you should switch to store is when leaving your coach for more than a week or so. Store mode eliminates MOST of the battery draw but not ALL. If your batteries are in good condition you should be able to leave it in store for at least a couple months without running them too low.
Bottom line, whether plugged into shore or using generator or alternator you must be in "use" mode to charge your batteries.
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