my bro in law just got an Airstream TT. Solar is installed. Met up with him for a shake out trip to a local CG. Soon realized that the batteries were not charging. It has a Renogy Adventurer controller. When I checked it it says E 0 1. Looks like some kind of error message. Did some research online and discovered that there are two models the Adventurer and the Adventurer Li. Both are identical on their face. I’m thinking it’s a bad controller or it’s not the Li. ( he does have Li batteries) Anyone our there with similar equipment?