[RMcNeal]

As stated, 11.5 volts is a dead battery. REC2 I believe stands for Receptacles 2nd circuit. The fridge may be running on inverter, which would kill your battery in short order. The disconnect in the front battery compartment is strictly for the inverter powering the fridge. If it is not turned off (disconnected), then the inverter can draw power from the batteries to power whatever is plugged into it, which SHOULD only be the fridge. If you shut off breakers when connected to shore power, it is likely you shut off your converter and thus no charge to the batteries. I would leave all the breakers on and just turn off whatever appliances and 110v items you do not need on. Also, while in storage, I would considering turning off (disconnecting) the battery disconnect switch in the battery compartment for the fridge unless you need the fridge running.