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The REDARC Smart Start SBI212 is a 12V, 200A continuous-duty solenoid battery isolator for dual-battery systems. It connects a start battery to an auxiliary battery and disconnects the auxiliary when the engine is off, so the start battery keeps its charge. Unlike diode isolators, it uses silver contacts and electronics that avoid the voltage drop and voltage spikes diode units bring. It suits commercial vehicles, 4WDs, boats and campers running fridges or other house loads, and its fault detection with LED indication is a step up from plain solenoids.
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Lowest price we've seen: $289.00 on Nov 12 at Main Line Overland. Tracked across 12 stores since Nov 12.
Owners of dual-battery rigs rate the SBI212 as a solid, simple isolator that does its job without voltage drop. Many praise the build and the low standby draw; some note it is a solenoid, not a charger, so it will not boost a deeply drained auxiliary.
The REDARC Smart Start SBI212 is a 12-volt DC battery isolator with a 200A continuous rating. It works as a solenoid priority system. It protects the start battery from excessive discharge while the auxiliary battery supplies non-essential loads. The alternator charges the auxiliary battery.
It is designed for extremely heavy-duty operation and is mainly used in commercial vehicle dual battery systems. Electronic components keep the solenoid from generating high voltage transients. It avoids the voltage drop that comes with a diode-type isolator.
The overmold design is compact and easy to install. The contacts are silver for longer life and suit marine applications. The unit has low standby current draw and is fully surge protected. Fault detection with LED indication reports over-voltage, voltage drop and excessive current draw conditions.
