I am camping now and have a 200w system. My buddy has the same system. My voltage while the sun was out was showing 12.3v, while my buddies showed 14.3v at the same time. Any ideas what the problem may be? I had no load on all day, and it was clear and sunny. My 2 6v never fully charged. Typically, the batteries show full charge by mid morning until now. Any help would be greatly appreciated.