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The REDARC Smart Start SBI212D is a microprocessor-controlled dual battery isolator for 12V systems. It uses a solenoid to protect the start battery from excessive discharge while letting the auxiliary battery run non-essential loads, and it carries a 200A continuous rating for heavy-duty use. The dual-sensing design also lets an auxiliary battery charged by solar or an external charger pass charge back to the start battery once it reaches 13.2V. It is a fit-and-forget part for 4WD, marine and camper setups rather than a gadget with an app or display.
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Owners of REDARC isolators generally rate them as reliable, set-and-forget parts for dual battery systems, with the dual-sensing version valued for solar and charger setups. Complaints tend to focus on the lack of detailed monitoring and the need for careful installation.
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.
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. It is rated for 12V DC and 200A continuous.
Fault detection with LED indication warns of voltage drop, over-voltage, or excessive current draw. Its components prevent the solenoid from generating high voltage transients. It has an overmold design, silver contacts for longer life that are suitable for marine applications, power saving technology, and full surge protection. REDARC recommends installation by a qualified auto electrician or technician.
