REDARC Dual Sensing Smart Start Battery Isolator 12V 200A

REDARC Dual Sensing Smart Start Battery Isolator 12V 200A

Protect your starting battery and intelligently manage charging between two batteries with the REDARC Smart Start® SBI212D Dual Sensing Battery Isolator. Built for demanding 12V dual battery systems, this microprocessor-controlled isolator delivers a 200A continuous current rating while automatically separating auxiliary loads from the battery you rely on to start your vehicle.

The REDARC SBI212D monitors battery voltage and automatically connects or isolates the start and auxiliary batteries as charging conditions change. This allows accessories such as refrigerators, lighting, air compressors, communications equipment, and other auxiliary loads to operate from the secondary battery without unnecessarily discharging the starting battery.

Unlike a conventional single-sensing isolator, the SBI212D features dual sensing technology. This allows charging to occur from either side of the system, making it especially useful when the auxiliary battery is connected to an external charging source such as solar or an AC battery charger. When suitable charging voltage is detected, the isolator can connect the batteries so both receive available charge.

REDARC combines this intelligent voltage management with surge protection, fault detection, power-saving technology, and heavy-duty silver contacts, creating a compact battery isolator suited to overland vehicles, 4WDs, work trucks, RV electrical systems, and marine applications.

200A Continuous Rating • Dual Sensing Technology • Automatic Battery Isolation • 12V Dual Battery Systems

Key Features

• 200A Continuous Current Rating: Supports high-current 12V dual battery systems used in demanding vehicle, commercial, RV, and marine applications.
• Dual Sensing Operation: Detects charging voltage from either the start battery or auxiliary battery side of the system.
• Automatic Start Battery Protection: Isolates the auxiliary battery and connected loads when voltage drops, helping preserve starting capacity.
• Microprocessor Controlled: Continuously monitors system voltage and controls battery connection automatically.
• Multiple Charging Source Support: Allows compatible alternator, solar, and external AC charging sources to contribute to battery charging.
• Fault Detection: Built-in monitoring helps identify operating conditions such as excessive voltage drop, over-voltage, or excessive current.
• LED Status Indication: Provides a quick visual reference for isolator operation and fault conditions.
• Surge Protection: Designed to help protect the isolator and connected vehicle electrical systems from voltage spikes.
• Heavy-Duty Silver Contacts: Provides reliable high-current switching and long service life.
• Compact Overmolded Construction: Durable design is suitable for installation in space-limited vehicle electrical systems.

Why It Performs

The SBI212D provides a straightforward way to manage two batteries without requiring the driver to manually connect and disconnect them. Once charging voltage rises to the appropriate level, the isolator can connect the batteries for charging. When voltage falls, it separates them again to protect the starting battery from auxiliary electrical loads.

• Protects Starting Capacity: Helps prevent camping and accessory loads from leaving your vehicle without enough battery power to restart.
• Charges From Either Direction: Dual sensing is particularly useful when solar or shore-powered charging equipment is connected to the auxiliary battery.
• Handles High-Current Systems: The 200A continuous rating supports demanding electrical installations where a lower-capacity isolator may be insufficient.
• Reduces Manual Battery Management: Automatic voltage sensing removes the need to routinely switch battery banks by hand.
• Minimizes Voltage Loss: Solenoid-based isolation avoids many of the charging-voltage losses associated with traditional diode isolators.
• Designed for Vehicle Environments: REDARC construction, surge protection, and fault monitoring support reliable use in harsh mobile applications.

Technical Specifications

• Brand: REDARC
• Model: SBI212D
• Product Type: Smart Start® Dual Sensing Battery Isolator
• System Voltage: 12V
• Continuous Current Rating: 200A
• Battery Sensing: Dual Sensing
• Control Type: Microprocessor Controlled
• Contact Type: Heavy-Duty Silver Contacts
• Protection: Surge Protection and Fault Detection
• Status Monitoring: LED Indication

What's Included

• (1) REDARC Smart Start® SBI212D Dual Sensing Battery Isolator

Fitment & Compatibility Note

The REDARC SBI212D is designed for 12V dual battery systems requiring up to 200A of continuous isolator capacity. Proper cable sizing, circuit protection, battery compatibility, alternator configuration, and installation practices are critical when working with high-current battery systems.

Vehicle charging architecture can vary substantially, particularly on newer vehicles equipped with variable-voltage or smart alternators. Confirm that a voltage-sensitive isolator is appropriate for your specific vehicle and charging system before installation. Applications requiring controlled multi-stage auxiliary battery charging may be better suited to a REDARC BCDC battery charger.

Ideal For

• Overland and expedition vehicles
• 4WD and off-road touring builds
• Truck and SUV dual battery systems
• Work trucks and commercial vehicles
• RV and camper electrical systems
• Marine dual battery installations
• Auxiliary batteries supporting refrigerators, lighting, compressors, and other accessories
• Systems using solar or external AC charging on the auxiliary battery side

Why Choose the REDARC Smart Start SBI212D?

• High-Current Capability: A 200A continuous rating makes the SBI212D suitable for demanding dual battery installations.
• Automatic Battery Protection: Helps protect the starting battery without requiring constant driver input.
• True Dual Sensing: Allows charging voltage originating at either battery to trigger battery connection.
• Flexible Charging Integration: Works well in systems incorporating alternator charging alongside solar or external battery chargers.
• Proven REDARC Engineering: Designed for mobile electrical systems exposed to vibration, temperature variation, and demanding operating environments.

Why Buy from Expedition Superstore?

• Authorized REDARC Dealer: Shop genuine REDARC battery management, charging, solar, and vehicle electrical products with knowledgeable support.
• Complete Dual Battery Solutions: Build your system with REDARC isolators, BCDC chargers, solar equipment, battery monitoring, wiring components, and other off-grid power equipment in one place.
• Expert Product Guidance: Our team can help determine whether an isolator, DC-to-DC charger, or more advanced battery management solution best fits your vehicle and electrical demands.
• Free Shipping: Enjoy free shipping on qualifying orders over $349, helping you put more of your budget toward your build.
• Planning a complete auxiliary power system? Schedule your build consultation with Expedition Superstore.