When you're installing a solar panel system, you need a disconnect switch that stops power flow safely during maintenance or emergencies. You'll want to evaluate switches based on amp ratings, voltage capacity, enclosure protection, and connector types.
At its core, a battery selector switch is a rotary switch that allows you to choose between multiple batteries. It typically has three positions: Off, 1, and 2. In the Off position, all batteries are disconnected from the electrical system, preventing any power flow.