Originally Posted by sideout1961
What exactly is the disconnect switch for? Is it cutting power to the whole camper or is it there for another purpose?
In general, a battery disconnect is used to simply isolate a battery from its load OR to switch between banks of batteries.
You would isolate in an RV to avoid the parasitic draws mentioned above. The battery will still deplete over time but at a much slower pace. The parasitic draws on my trailer would run my battery bank down to a 50% SOC within a couple of weeks, but my batteries will last several months if disconnected.
The first picture below will allow you to isolate and that is it. This works well for one 12-volt battery or a bank of two 6-volt batteries.
Some disconnects allow more functionality. The second picture shows a disconnect that allows you to switch between batteries, use both batteries or disconnect all. This works well with two 12-volt batteries or two banks with each bank containing two 6-volts. There are several combinations.