The battery disconnect (not a salesman switch)
User for when the RV is in storage
Will disconnect the batteries from most but not all of the RV house circuits, it will disconnect the house DC fuse panel, which is lights, water pump, fridge and heater controls etc
It might not disconnect the LP alarm and other items
If the charge converter is behind aka post of the DC fuse panel, then that will disconnect the charge to the batteries
If the converter is located somewhere else then the disconnect might not unhook from the charge circuit
Voltage needed to be checked at the batteries with converter on to see if it's too high, then turn off shore power to test the batteries,