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Dual Battery Isolators

Get the most out of your batteries with REDARC’s state of the art dual battery isolators. Used primarily in 4WD and commercial vehicles, our dual battery isolators are designed to significantly extend battery life and safely charge your auxiliary battery. Not to mention, these battery chargers also excel in harsh conditions. learn more

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  1. 12V 100A Smart Battery Isolator SBI12
    NZ$243.80
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    The REDARC Smart Start SBI12 100A is a 12V DC 100A microprocessor-controlled, dual battery isolator designed to protect the start battery from excessive discharge while allowing the auxiliary battery to supply charge to non-essential loads.
  2. 12V 200A Smart Battery Isolator SBI212
    NZ$493.35
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    The REDARC Smart Start SBI212 200A is a 12V DC 200A microprocessor-controlled, dual battery isolator designed to protect the start battery from excessive discharge while allowing the auxiliary battery to supply charge to non-essential loads.
  3. Out of stock
    Smart Start SBI 24V 100A SBI24
    NZ$292.10
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    The REDARC Smart Start SBI24 100A is a 24V DC 100A microprocessor-controlled, dual battery isolator designed to protect the start battery from excessive discharge while allowing the auxiliary battery to supply charge to non-essential loads.
  4. 24V 200A Smart Battery Charger SBI224
    NZ$540.50
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    The REDARC Smart Start SBI224 200A is a 24V DC 200A microprocessor-controlled, dual battery isolator designed to protect the start battery from excessive discharge while allowing the auxiliary battery to supply charge to non-essential loads.
  5. 12V 100A Dual Smart Battery Isolator SBI12D
    NZ$280.60
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    The REDARC Smart Start SBI12D 100A dual battery isolator enables the user to charge a 12 volt start battery from a solar panel or battery charger on the auxiliary battery.
  6. Out of stock
    12V 200A Dual Smart Battery Isolator SBI212D
    NZ$569.25
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    The REDARC Smart Start SBI212D 200A dual battery isolator enables the user to charge a 12 volt start battery from a solar panel or battery charger on the auxiliary battery.
  7. Out of stock
    24V 100A Dual Smart Battery Isolator SBI24D
    NZ$338.10
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    The REDARC Smart Start™ SBI24D is a 24V 100A dual battery isolator that is used to isolate start and auxiliary batteries in a dual battery system. It protects the start battery from a low charge in the secondary battery.
  8. Out of stock
    24V 200A Dual Smart Battery Isolator SBI224D
    NZ$617.55
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    The REDARC Smart Start SBI224D 200A dual battery isolator enables the user to charge a 24 volt start battery from a solar panel or battery charger on the auxiliary battery.
  9. Out of stock
    Smart Start Battery Isolator & Wiring Kit 12V SBI12KIT
    NZ$474.95
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    The REDARC 12V Smart Start Dual Battery Isolator and Wiring Kit (part number SBI12KIT) comes with everything required to install your Smart Start® Dual Battery Isolator, just plug and play.
  10. 12V 100A Smart Battery Isolator Lithium Load Disconnect SBI12-LLD
    NZ$243.80
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    The SBI12-LLD is a microprocessor-controlled Load Disconnect Isolator. The SBI12-LLD is designed specifically for use in LiFePO4 battery applications as a system to protect the lithium battery from being excessively discharged by auxiliary loads.
  11. 12V 100A Smart Battery Isolator BMS Load Disconnect SBI12-BLD
    NZ$242.65
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    The SBI12-BLD is used in conjunction with a REDARC Manager15 or Manager30 BMS in a 12v negative ground automotive system to protect the auxiliary battery from excessive discharge.
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REDARC Battery Isolators


REDARC’s Smart Start (SBI) battery isolators prevent your secondary battery draining your main battery, so you can stay out on the road for longer. Microprocessor controlled, this dual battery isolator is designed to protect the start battery from excessive discharge while allowing the auxiliary battery to supply charge to non-essential loads. The dual sensing model can also be used to isolate the start and auxiliary batteries in a system where the auxiliary battery is being charged by another source, such as 4WD solar panels. Not to mention, it features sophisticated fault detection and LED indication to warn the user of faults including over-voltage, voltage drop and excessive current draw conditions.

Easy to install and compact in size, REDARC’s isolators will suit all of your battery charging needs. If you need some help with the set up, check out REDARC’s Smart Start Battery Isolator and Wiring Kit. It comes with everything you need to install your isolator, so you can just plug in and play. REDARC are always here to answer any of your questions too. 

Before choosing any dual battery isolator, be sure to check out what the best battery charger is for your vehicle using the free REDARC Dual Battery Selector tool. For the ultimate in dual battery power check out REDARC's range of Lithium Batteries. 

Getting ready for your next big 4WD adventure? Check out the REDARC Tow Pro range too - an effective trailer brake control system that is designed to make you feel more secure on the road!

Having the right dual battery system for all of your off-road adventures is essential. With a REDARC battery isolator, you can go further, explore more and always be one step ahead.

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Need a little help with choosing the right product? We're here to help! You can use our handy vehicle look-up tool, find a local installer or stockist in your area or check out our FAQs.

Still not sure? Don't stress, you can contact our helpful Tech Support Team by phone or email too.

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