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The REDARC SBI212D is a microprocessor-controlled dual battery isolator rated at 12V and 200A continuous, built for heavy-duty 4WD and commercial dual-battery systems. It protects the start battery from excessive discharge while letting the auxiliary battery run non-essential loads. The dual-sensing design also lets solar panels or an external AC charger charge the auxiliary battery, and once that battery reaches 13.2V the start battery gets charged too. It adds fault detection with LED status indication and surge protection that avoids the voltage transients and losses of a diode isolator.
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Owners of the SBI range describe it as a simple, reliable isolator that does its job in dual-battery 4WD setups. Complaints center on the audible solenoid click and the fact that it is not a DC-DC charger for vehicles with variable-voltage alternators.
The REDARC Smart Start SBI212D is a microprocessor-controlled dual battery isolator for use in a dual battery system. It works as a solenoid priority system. It protects the start battery from excessive discharge while the auxiliary battery supplies non-essential loads. Its compact size makes it easy to install.
This dual sensing model isolates the start and auxiliary batteries where the auxiliary battery may be charged by solar panels, an external AC battery charger, or another external source. Once the auxiliary battery reaches 13.2V, the external source can also charge the start battery. The SBI range also allows additional charging from the vehicle's alternator.
The isolator has fault detection and LED indication of operation. It warns of voltage drop, over-voltage, or excessive current draw conditions. Its components prevent the solenoid from generating high voltage transients, which makes it better than a diode battery isolator. It has full surge protection and is used primarily in 4WD and commercial vehicles.
