VICTRON Battery Protect 12/24V-220A Battery Protection
BatteryProtect disconnects the battery from non-essential loads before it is completely discharged (at risk of damage) or before its power is reduced to the point where it is insufficient to start the engine.
BatteryProtect is a one-way device. It can only handle current in one direction, so either current on load or current from a charger, but not both currents at the same time. Other than that, current can only flow from the Battery terminal to the Charge terminal. In case of use with a charge, the battery is connected to the battery terminal and in case of use with a charger, the charger is connected to the battery terminal.