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The REDARC Smart Start® SBI24D is a dual battery isolator used to isolate the start and auxiliary batteries in a dual battery system. It will protect the start battery from a low charge in the secondary battery so it won’t drain the primary battery. The SBI24D provides 24 volt DC incorporating 100A of continuous ratings.
The dual sensing model is used to isolate the start and auxiliary batteries in a system where the auxiliary battery may also be charged by an external source such as Solar panels or an external AC battery charger. The SBI24D also allows the start battery to be topped up and charged from the auxiliary battery when the auxiliary battery is being charged by an external source once it reaches 26.4 volts.
Power Saving Technology
The Smart Start SBI24D is a microprocessor controlled battery isolator that incorporates electronic components preventing the solenoid from generating high voltage transients. It is better than a diode battery isolator due to the voltage drop associated with diode type isolation. It features sophisticated fault detection and LED indication of operation to warn the user of faults including over-voltage, voltage drop and excessive current draw conditions.
Used primarily in commercial vehicles, the Smart Start SBI is a safe way to charge auxiliary batteries.
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See the correct way to mount a Smart Battery Isolator
See a basic Smart Battery Isolator install
For reviews on the Smart Start Battery Isolator, watch the below
What is a smart battery isolator and why would you need it?
Explaining offroad battery chargers - with Patriot Campers
Review by Pat Calinan from 4x4 Adventure
REDARC Smart Start Dual Battery Isolator Features with Carlisle Rogers 4WD Touring Australia
The difference between a REDARC SBI & BCDC with 4WD NZ