1. Plug the shore power into the Power Inlet on the front of the trailer. The green “Charging/Shore Power” LED light will light up if power is detected and the trailer is charging.2. Inverter will power on and, if charging, will show one of the following messages:a. FUL - By-Pass Mode. Battery is fully charged.b. BUL-CHG - Battery charging in progress.c. ABS-CHG - Absorption mode. This means the batteries are 90% charged.