REDARC SBI12 Smart Battery Isolator 12V 100A Dual Battery System

REDARC Smart Start SBI12 battery isolator designed for 12V dual battery systems.

Automatically protects the start battery while charging the auxiliary battery during driving.

 

The REDARC SBI12 is a microprocessor-controlled smart battery isolator designed for dual battery systems in:

 

• 4WDs
• Touring vehicles
• Work vehicles
• Caravans and camper setups

 

 

Its main job is to:

 

• Prioritise charging of the start battery
• Automatically connect the auxiliary battery once charging voltage is reached
• Disconnect the auxiliary battery when voltage drops to protect the start battery (redarcelectronics.com)  

 

 

This means you can run:

 

• Fridges
• Lights
• Compressors
• Camping accessories

 

 

…without flattening your cranking battery.

 

 

 

 

Key Features

 

 

• 12V system
• 100A continuous rating
• 400A surge capacity
• Microprocessor controlled
• Voltage sensitive operation
• Low standby current draw
• Surge protected
• Silver contact internals for durability (redarcelectronics.com)  

 

 

 

 

 

What it actually does

 

 

When the vehicle starts:

 

• the alternator charges the main battery first

 

 

Once voltage reaches:

 

• approximately 13.2V

 

 

…the SBI12 automatically connects the auxiliary battery for charging.

 

When the vehicle is turned off and voltage drops:

 

• the unit disconnects the auxiliary battery

 

 

This prevents accessories from draining the start battery

 

What’s the difference between SBI12 and SBI12D?

The SBI12D supports dual sensing, useful when charging from solar or external charging sources.

 

Is this a DC-DC charger?

No — it is a voltage-sensitive isolator, not a DC charger.

 

Is this good for touring setups?

Yes — very common in 4WD dual battery systems.

 

Can it run a fridge setup?

Yes — ideal for auxiliary battery/fridge systems.

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