Get the most out of your batteries with REDARC’s state of the art dual battery isolators. Used primarily in 4WD and commercial vehicles. our dual battery isolators are designed to significantly extend battery life and safely charge your auxiliary battery. Not to mention, these battery chargers also excel in harsh conditions. REDARC Battery Isolators REDARC’s Smart Start (SBI) battery isolators prevent your secondary battery-draining your main battery, so you can stay out on the road for longer. Microprocessor controlled, this dual battery isolator is designed to protect the start battery from excessive discharge while allowing the auxiliary battery to supply charge to non-essential loads. The dual-sensing model can also be used to isolate the start and auxiliary batteries in a system where the auxiliary battery is being charged by another source, such as 4WD solar panels. Not to mention, it features sophisticated fault detection and LED indication to warn the user of faults including over-voltage, voltage drop and excessive current draw conditions.