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cwhite... FYI - the battery voltage on an RV or auto battery should be around 12.75 volts, not 12 volts as most terminology implies. You might want to check what constitutes a "low voltage" status on the panel. I have read that 12 volts is considered a dead battery and is when recharging should occur to save your battery from permanent damage and that if the battery ever gets below 10 volts it could be considered dead or ready to die even if one recharged it. I am not sure how low a voltage could get for a trailer sitting for 3 weeks, especially since there are devices in your rig that drain your battery even when it sits. Then you hitch up and drive some distance and this might charge enough to recover your battery so it can report "low Voltage".
Now that you have a new toy (the On Command center) there may be a tendency to panic with the new information available to you. Similar to what happened to many of us when we started using a TPMS (Tire Pressure Monitoring System) and didn't realize the interior tire pressure or temps could get higher than what we would consider safe, but is still considered normal. Give yourself a chance to correlate the information with what is actually measured. You have an opportunity to teach us what's really going on.
There's so much to know about RVing, what's normal, expected or problematic.
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