How do you hook-up a “Renogy 100W, 12V, Monocrystalline Solar Panel ($140)” to my 2004 Grandby 4WC? I want to use this Solar Panel as a portable unit on the "ground" to charge my one auxiliary 12V battery, Laptop and 2 portable fans. Is connecting to my 2004 Grandby 4WC simply a matter of using an extension cord from the Solar Panel to the Shore Power electrical male wall outlet on the exterior wall of the camper??? Or does the connection have to be manually wired into the electrical junction box inside the camper??? Does my camper already have a "Battery Charger - Charge Controller"??? If it needs to be wired into the panel - where can I have this work done if I live in Olympia, WA. Maybe, Stan of 4WC fame is reading this inquiry and can respond? Thanks from > Oly Bill