Hi, I just installed the P30L in my van, 100 W panel + 100 Ah 12V battery. With a fully charged battery from shore connection previous, I'm finding that the P30L is running the voltage up on the system. The battery voltage is exceeding 18 volts when connected to the panels and I fear its beginning to boil the battery. When I disconnect the panel from the controller, the system voltage immediately reverts to ~12.6 volts (with mini fridge on). Any ideas why its doing this?