With all the demands put on the battery of a serious off road vehicle an auxiliary battery is a sensible accessory.  To run that battery you will need a split charge system. The T-MAX auxiliary battery system from Bearmach automattically links two batteries together for charging, but Isolates them when discharging.  It has a manual overide feature and built in safety protection.  This system is 12v with a 180a load capacity.  Kit includes solenoid, display unit and all wiring and connectors and instructions.