The 1315-200 (bidirectional) isa 200A battery separator modules with an integrated relay for 12V systems. Theunit monitors both the main and auxiliary battery banks. If the main battery forthe 1315-200 is above the connect threshold, the relay connects the two bankstogether. If the main battery or either batteries for the 1315-200 are belowthe disconnect threshold the unit will open the relay. The connect threshold isset to a nominal voltage of 13.2V, which would only be reached when thecharging system is operating. This will cause the relay to close and thecharging system can charge both banks of batteries. The disconnect voltage isset to a nominal 12.8V, which is near the full charge resting voltage of thebatteries. This will cause the relay to be opened shortly after the engine isstopped, attempting to preserve 100% of the starting battery capacity forengine cranking. When the engine is started, the start signal causes thecontroller to check if the auxiliary battery is within about 0.85V of the mainbattery; if so, the relay contact is closed. Thus providing the starter systemwith maximum battery voltage available.
