REDARC’s Smart Start (SBI) battery isolators manage dual battery setups by charging the auxiliary battery from the alternator while protecting the starter battery from discharge when the engine is off.
They can also work with a BCDC charger to enable jump starting from the auxiliary battery if the starter battery fails. When the engine is off and voltage drops below 12.7V, the SBI disconnects the auxiliary battery to prevent draining the starter battery.
This information is applicable to the following products:
- SBI12, SBI24, SB212, SB224, SBI12D, SBI24D, SB212D, SB224D, SBI12-BLD, SBI12-LLD
REDARC’s Smart Start (SBI) battery isolators allow your auxiliary battery to charge from the alternator while the vehicle is running, and protect the start battery from discharging when the engine is off.
It can also be used in-conjunction with an in-vehicle battery charger, or BCDC, to allow the start battery to be jump started from the auxiliary battery in the event that the start battery is discharged or fails.
In a dual battery setup where one battery is used as a starter battery to operate the vehicle and one as a secondary to run electrical devices, the SBI ensures your start battery doesn’t run flat when you use your secondary battery while the engine is turned off.
When the engine is turned off, and therefore the alternator is no longer running, the start battery will drop below 12.7 volts and the SBI will disengage the secondary battery. This will stop any loads connected to the auxiliary battery from draining the start battery.