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The REDARC Smart Start SBI12D is a 100A, 12V dual battery isolator for vehicles with a main and auxiliary battery. It disconnects the auxiliary battery from the start battery when the engine is off, so the start battery keeps enough charge to crank while accessories run off the auxiliary. It is a solid-state unit with no moving contacts, which suits 4WDs, campers and work vehicles that draw fridge or lighting loads. Compared with simple voltage-sensing relays, it adds dual sensing: it reads voltage on both batteries, so it also works with modern variable-voltage alternators and can charge from either side. It is a bare isolator, so wiring and fuses are extra.
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Owners of 4WDs and touring rigs rate the SBI12D as a dependable, fit-and-forget isolator. Most praise the dual sensing and solid build; the main complaints are that it arrives without wiring or fuses and that installation is not a beginner job.
The REDARC Smart Start SBI12D 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.
The dual sensing design isolates the start and auxiliary batteries in a system where an external source may charge the auxiliary battery. Once the auxiliary battery reaches 13.2V, the external source can also charge the start battery. The unit is compact and designed for heavy-duty operation.
Fault detection and LED indication warn of voltage drops, over-voltage and excessive current draw. The unit has components that prevent the solenoid from generating high voltage transients. It also has full surge protection. It avoids the voltage drop associated with a diode-type isolator. It is used primarily in 4WD and commercial vehicles.
