Looking to add a dual battery system to your 4WD? Shaun Whale from 4WD Action walks you through the basics behind battery isolators so you can choose the best setup for your needs. To find out what 12V charging solution is best for your battery type, alternator and travel needs, use the REDARC vehicle selector tool.
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21 Dec 2025A dual battery setup is the smartest way to power electronics from your vehicle. If you want to run a fridge, charge devices, power camp lights, or work from your vehicle, powering these accessories from a single start battery will not cut it and could leave you stranded. That is where a dual battery setup comes in.
Popular Products
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![REDARC SBI12]()
Smart Start SBI 12V 100A SBI12$165.00Out of stockThe REDARC Smart Start® SBI12 is a 100A 12V microprocessor-controlled battery isolator which protects the start battery from excessive discharge, while allowing the auxiliary battery to supply charge to non-essential loads. -
![REDARC SBI12-BLD]()
BMS Load Disconnect Isolator SBI12-BLD$165.00In stockThe SBI12-BLD is used in conjunction with a REDARC Manager30 BMS in a 12v negative ground automotive system to protect the auxiliary battery from excessive discharge. -
![REDARC SBI12-LLD]()
Smart Start Load Disconnect Isolator SBI12-LLD$165.00In stockThe 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. -
![REDARC SBI12D]()
Dual Sensing Smart Start Battery Isolator 12V 100A SBI12D$195.00In stockThe REDARC Smart Start® SBI12D is a 100A 12v dual battery isolator used in a dual battery system. It protects the start battery from excessive discharge while allowing the auxiliary battery to supply non-essential loads. -
![REDARC SBI12KIT]()
Smart Start Battery Isolator & Wiring Kit 12V SBI12KIT$320.00In stockThe REDARC Smart Start® SBI12 is a 100A 12v dual battery isolator used in a dual battery system. It protects the start battery from excessive discharge while allowing the auxiliary battery to supply non-essential loads.
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![REDARC SBI212]()
Smart Start SBI 12V 200A SBI212$330.00In stockThe REDARC Smart Start® SBI212 is a 200A 12V battery isolator used as a solenoid priority system to protect the start battery from excessive discharge while the auxiliary battery is supplying non-essential loads. -
![REDARC SBI212D]()
Dual Sensing Smart Start Battery Isolator 12V 200A SBI212D$385.00In stockThe REDARC Smart Start® SBI212D is a 12v 200A dual battery isolator used in a dual battery system. It is designed to protect the start battery from excessive discharge while allowing the auxiliary battery to supply non-essential loads. -
![REDARC SBI224]()
Smart Start SBI 24V 200A SBI224$365.00In stockSmart Start® SBI224 protects the start battery from excessive discharge while the auxiliary battery is supplying non-essential loads in dual battery systems.
