This is the Smart Version of the Victron Battery Protect.  Programming is made easier using a Bluetooth link to your phone or tablet.  This can be used as a stand alone device or as part of a control system for a Lithium Ion battery bank. The Victron Battery protect is a solid state relay and is used to disconnect the load from a battery when it is becoming over discharged.

Can be programmed to behave as a 12 or 24 volt solid state DC relay

The alarm output is activated if the battery voltage drops below the preset disconnect level for more than 12 seconds. Starting the engine will therefore not activate the alarm. The alarm output is a short circuit proof open collector output to the negative (minus) rail, max. current 50 mA. The alarm output is typically used to activate a buzzer, LED or relay. The load will be disconnected 90 seconds after the alarm has been activated. If the battery voltage increases again to the connect threshold within this time period (after the engine has been started for example), the load will not be disconnected. The load will be reconnected 30 seconds after the battery voltage has increased to more than the preset reconnect voltage.