We are trying to figure out how to charge our battery with shoreline. We bought our Tag 2 weeks ago. First trip we had shore power. Stored our trailer as is in the garage. This weekend we had a basic campsite. While camping the 2 days we had our battery switched to on the entire weekend. Used it for charging phone, water pump, etc. Sunday morning we had no power. The battery had died. What gives? Newbie here trying to understand why the solar panel wasn't charging the battery.