Product description:

Battery separators provide a solenoid priority system for multi-battery electrical systems. Designed to protect the charging system from excessive electrical loads, the separator disconnects the main and auxiliary batteries from one another. 

Disconnecting the two allows the separator to prioritize the charge based on priority. 

When the main battery is low, the separator’s optional engine start assist will utilize auxiliary battery power to start the engine. 

Engine start assist

When the engine starter is engaged, the battery separator will compare the voltage in both main and auxiliary batteries. If the main battery is lower than the auxiliary battery, the battery separator will engage the auxiliary battery to aid in engine start. The start signal must reach 3 volts in order for the auxiliary to main battery connection procedure to begin. 
 

Charging system protection

Once the engine starts, the battery separator monitors the main battery and charging system voltage. When the charging system reaches 13.2 volts, the battery separator will engage, signaling a charged main battery. The auxiliary battery is then connected to the vehicle charging system. When the charging system reaches 12.8 volts, the battery separator will disconnect the auxiliary battery to protect the vehicle’s charging system. This process of managing the battery charging is repeated until the engine is turned off.
 

Priority charging

The battery separator waits until the main battery’s active charging source reaches approximately 13.2 volts before it begins charging the auxiliary battery. A uni-directional battery separator (RB-BS-1314) will only charge the auxiliary battery when the main battery reaches 13.2 volts. A bi-directional battery separator (RB-BS-1315) will engage both main and auxiliary batteries and will disconnect at approximately 12.8 volts. 
 

Simple installation

The battery separators work with any 12 volt DC, negative ground charging system using 100 amps or less. They easily connect to the main battery, auxiliary battery and ground. No system modifications are necessary.