This unit will direct alternator charge current to your main and auxiliary battery when the engine is running. When you are stationary and drawing battery power (for fridges etc), the unit will isolate one battery before both batteries go flat, enabling you to start your vehicle the next morning.

Specifications:
* 12 - 48 volt operating range
* 70 amp current capacity
* Dual battery support * -40°C to 80°C operating temperature
* 0.9VDC voltage drop @ full load
* Size 83(W) x 114(L) x 79(H)mm