REDARC Smart Start SBI12 12V 100A Instruction Manual

1. Introduction

This manual provides comprehensive instructions for the installation, operation, and maintenance of the REDARC Smart Start SBI12 12V 100A Battery Isolator. The SBI12 is a microprocessor-controlled device designed to manage dual battery systems by protecting the primary (start) battery from excessive discharge while allowing the auxiliary battery to power non-essential loads. It functions as a solenoid priority system, ensuring efficient charging of your secondary battery when the vehicle is in motion.

2. Product Overview

The REDARC Smart Start SBI12 offers advanced battery management for 12V dual battery systems, providing a continuous rating of 100A. Key features include:

Microprocessor Control: Ensures precise management of battery charging and isolation.
Solenoid Priority System: Optimizes charging for the auxiliary battery.
Overmold Design: Provides enhanced durability and protection.
Compact Size: Facilitates easy installation in various vehicle types.
Silver Contacts: Ensures extended lifespan and suitability for marine environments.
Power Saving Technology: Minimizes current draw when in standby.
Fault Indication: LED indicators provide warnings for conditions such as voltage drops, over-voltage, and excessive current.
Fully Surge Protected: Guards against electrical surges.

Unlike diode-type isolators, the SBI12 avoids voltage drop issues, ensuring more efficient power transfer.

3. Safety Information

Please read and understand all safety warnings and instructions before installing or operating the REDARC Smart Start SBI12. Failure to do so may result in injury, damage to the product, or damage to your vehicle.

Always disconnect the vehicle's main battery before performing any electrical work.
Ensure all wiring is correctly sized for the current draw and properly fused.
Wear appropriate personal protective equipment, including eye protection and gloves.
Avoid installing the unit in areas exposed to extreme heat, moisture, or corrosive substances unless specifically designed for such environments.
Consult a qualified auto electrician if you are unsure about any aspect of the installation.
This product is designed for 12V DC systems only. Do not connect to other voltage systems.

4. Setup and Installation

Proper installation is crucial for the optimal performance and longevity of your SBI12. The unit should be mounted securely in a dry, well-ventilated area, away from direct heat sources.

4.1 Component Identification

Image 4.1.1: Front view of the REDARC Smart Start SBI12 battery isolator, showing the red housing with the REDARC logo and "Designed and manufactured in Australia" text, along with the main terminals and wiring connections.

Image 4.1.2: Side view of the REDARC Smart Start SBI12, illustrating the compact design and the robust terminals with protective caps.

REDARC Smart Start SBI12 alternate side view

Image 4.1.3: Another side view of the REDARC Smart Start SBI12, highlighting the wiring connections including the ground wire labeled "GND".

4.2 Wiring Diagram

The following diagram illustrates a standard installation for the Smart Start SBI12 in a dual battery system.

Smart Start standard installation wiring diagram

Image 4.2.1: Standard installation wiring diagram for the REDARC Smart Start SBI12. It shows the connection between the start battery and the auxiliary battery via the SBI12, with fuses on both positive lines and ground connections for both batteries and the isolator.

Connect the primary battery positive terminal to one of the main terminals on the SBI12 via a suitably rated fuse.
Connect the auxiliary battery positive terminal to the other main terminal on the SBI12 via a suitably rated fuse.
Connect the thin black wire from the SBI12 to a good chassis ground point.
Ensure all connections are clean, tight, and protected from environmental elements.
Use appropriate gauge wiring for the expected current draw (e.g., #4 pure copper wire for 60A fuse as suggested by a user review, but always refer to specific wiring guidelines for your application).

4.3 Pre-Installation Checks

Verify that both the start and auxiliary batteries are in good condition.
Confirm that the vehicle's charging system is functioning correctly.
Gather all necessary tools and materials, including fuses, wiring, terminals, and mounting hardware.

5. Operating Instructions

The REDARC Smart Start SBI12 operates automatically to manage your dual battery system.

Automatic Engagement: When the vehicle's engine is running and the primary (start) battery reaches a sufficient charge level (typically around 13.2V for 12V systems), the SBI12 will automatically engage, connecting the auxiliary battery to the charging system. This allows the auxiliary battery to be charged.
Automatic Disengagement: When the engine is turned off and the primary battery voltage drops below a preset threshold (typically around 12.7V), the SBI12 will disengage, isolating the auxiliary battery. This prevents the auxiliary battery from drawing power from the primary battery, ensuring the primary battery remains charged for starting the vehicle.
Emergency Start/Bridging Function: Some SBI12 models may include a manual override or emergency start feature, allowing you to temporarily bridge the two batteries. Consult your specific product documentation or REDARC support for details on this function if present.
LED Indicator: The SBI12 features an LED indicator that provides visual feedback on its operational status and any detected faults. Refer to the troubleshooting section for interpreting LED signals.

6. Maintenance

The REDARC Smart Start SBI12 is designed for minimal maintenance. However, periodic checks are recommended to ensure optimal performance:

Visual Inspection: Regularly inspect the unit and all wiring connections for signs of corrosion, damage, or loose terminals.
Cleanliness: Keep the unit free from dirt, dust, and moisture. Use a dry cloth for cleaning.
Terminal Checks: Ensure all battery terminals and connections to the SBI12 are clean and tight.
Fuse Inspection: Periodically check the fuses in the positive lines to both batteries for continuity and proper rating.

7. Troubleshooting

The SBI12 incorporates fault detection and an LED indicator to assist with troubleshooting.

Symptom / LED Indication	Possible Cause	Solution
SBI12 not engaging (auxiliary battery not charging)	Primary battery voltage too low. Loose or corroded connections. Blown fuse. Faulty ground connection.	Check primary battery charge. Inspect and clean all connections. Check and replace fuses if necessary. Verify ground connection integrity.
LED indicates fault (e.g., flashing pattern)	Voltage drop detected. Over-voltage condition. Excessive current draw. Internal fault.	Check wiring for resistance, ensure proper gauge. Verify vehicle charging system output. Reduce load on auxiliary battery or check for short circuits. Contact REDARC support if issues persist after checking external factors.
SBI12 remains engaged when engine is off	Faulty unit. Incorrect wiring.	Verify wiring against diagram. Contact REDARC support.

For detailed fault code interpretations or persistent issues, refer to the official REDARC documentation or contact their technical support.

8. Specifications

Model Number	SBI12
Brand	REDARC
Voltage	12 Volts DC
Continuous Rating	100 Amps
Item Weight	9.1 ounces (approx. 258 grams)
Package Dimensions	3.7 x 2.99 x 2.95 inches (approx. 9.4 x 7.6 x 7.5 cm)
Manufacturer Part Number	SBI12

9. Warranty and Support

For specific warranty information, please refer to the documentation provided with your REDARC Smart Start SBI12 or visit the official REDARC website.

If you require technical assistance, have questions about installation, or need help choosing the best dual battery setup for your needs, REDARC offers support resources.

REDARC Support:

Visit the official REDARC Store on Amazon for product information.
Consult the free REDARC dual battery selector tool (external link, check REDARC website for current URL).
Contact REDARC directly through their official website for technical support.

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REDARC SBI12