Redarc SPMB0003 Manual

The Redarc SPMB0003 is a high-performance, dual-input in-vehicle battery management system designed for 12V applications. It intelligently manages power from both a vehicle's alternator and an auxiliary solar panel to charge a secondary battery, ensuring reliable power for accessories while protecting the start battery. Below are key sections covering safety, features, installation, configuration, operation, and troubleshooting.

Features at a Glance

Key components: Dual-input DC-DC charger, LED status indicators, Input terminals (Alternator, Solar), Output terminals (Auxiliary Battery), Ground connection.

Feature	Description
Dual Input	Accepts charge from vehicle alternator and solar panel simultaneously
Smart Charging	Multi-stage charging (Bulk, Absorption, Float) for battery health
LED Status Indicators	Visual feedback for input source, charging stage, and faults
Input Protection	Over-voltage, reverse polarity, and over-temperature protection
Output Isolation	Prevents auxiliary battery from draining the start battery
Compact Design	Rugged, sealed housing suitable for engine bay mounting
Wide Input Range	Accepts alternator (9-32V) and solar (9-32V) inputs
Battery Compatibility	Supports Lead-Acid, AGM, Gel, and Lithium (LiFePO4) batteries
Temperature Sensing	Optional sensor for optimized charging based on battery temperature
Ignition Sensing	Automatically activates when vehicle ignition is on

Installation

Unpack and inspect contents. Ensure vehicle is off and batteries are disconnected.

1. Mount the unit: Choose a clean, dry location in the engine bay or cabin, away from excessive heat and moisture.
2. Connect to Start Battery: Run appropriately sized cable from the positive terminal of the start battery to the unit's "IGN/ALT" input. Install a fuse within 200mm of the battery.
3. Connect to Auxiliary Battery: Run cable from the unit's "BATT" output to the positive terminal of the auxiliary battery. Install a fuse near the battery.
4. Connect Solar Input (Optional): Connect the positive from the solar panel to the "SOLAR" input. Install an isolator switch or circuit breaker.
5. Connect Ground: Connect the unit's "GND" terminal to the vehicle chassis or a common ground point.
6. Reconnect batteries and verify all connections are tight and secure.

WARNING! Incorrect installation can cause fire, electric shock, or damage. Ensure correct polarity and use recommended cable sizes. Disconnect power before working on the system.

First-Time Setup

Once installed, power on the system by starting the vehicle or connecting solar power.

1. Initialization: The unit will perform a self-test; LEDs will sequence on power-up.
2. Battery Type Selection: Use the DIP switches (if equipped) on the side of the unit to select the correct chemistry for your auxiliary battery (e.g., AGM, GEL, LITHIUM).
3. Verify Input Source: The LED will indicate which input source (Alternator or Solar) is active and providing charge.
4. Charging Stage Observation: Monitor the LED to confirm it progresses through Bulk (solid), Absorption (slow flash), to Float (fast flash) stages.
5. Load Connection: Connect your auxiliary loads (fridge, lights, etc.) to the auxiliary battery, not directly to the SPMB0003 unit.

CAUTION! Do not connect loads exceeding the unit's rated output current. Ensure the auxiliary battery is securely mounted and in a ventilated space.

Specifications

• Model: SPMB0003
• Input Voltage (Alternator): 9-32V DC
• Input Voltage (Solar): 9-32V DC
• Output Voltage: Programmable for 12V or 24V auxiliary battery systems
• Charge Current: Up to 30A (combined from both inputs)
• Efficiency: >90% typical
• Operating Temperature: -25°C to +60°C (with derating above 40°C)
• Protections: Over-voltage, Reverse Polarity, Short Circuit, Over-temperature
• Battery Types: Lead-Acid, AGM, Gel, Lithium (LiFePO4) - selectable
• Enclosure Rating: IP67 (Dust and water resistant)
• Dimensions: 150mm x 90mm x 40mm (approx.)

Controls and Indicators

Status is communicated via a multi-color LED indicator.

LED Behavior:

• Solid GREEN: Bulk/Absorption charging in progress.
• Flashing GREEN (Slow): Absorption stage.
• Flashing GREEN (Fast): Float/Maintenance stage.
• Solid YELLOW: Input voltage present but charging paused (e.g., battery full, temperature limit).
• Flashing YELLOW: Input voltage too low (check source).
• Flashing RED: Fault condition (over-temperature, over-voltage, battery disconnect).
• OFF: No input power or unit in standby (ignition off).

DIP Switches (if applicable): Located under a cover. Used to set battery type (1-4) and other advanced parameters as per the wiring guide.

Connecting Power Sources

Alternator Input: Connect to vehicle's start battery via ignition-sensed circuit. Solar Input: Connect to solar panel regulator output or directly (if panel voltage is within range).

1. Ensure all power sources and batteries are disconnected before wiring.
2. Use minimum cable sizes as specified in the installation guide (e.g., 6 B&S for 30A).
3. Fit appropriate fuses or circuit breakers on all positive cable connections close to the source battery.
4. For solar, a blocking diode or regulator may be required if panel open-circuit voltage exceeds 32V.
5. After connections, restore power. The unit will prioritize the alternator input when the vehicle is running, supplementing with solar if available.

Tip: For optimal solar harvesting, ensure the solar panel is correctly angled and free of shade.

Operating Modes

The unit automatically manages between several modes based on input conditions and battery state.

1. Ignition/Driving Mode: Vehicle running. Alternator is the primary charge source. Unit delivers full available current to auxiliary battery.
2. Solar Only Mode: Vehicle off. Solar panel provides charge, maintaining the auxiliary battery and powering small loads.
3. Combined Mode: Vehicle running with solar connected. Inputs are combined to provide maximum charge current (up to the unit's limit).
4. Float/Maintenance Mode: Auxiliary battery reaches full charge. Unit reduces voltage to a safe float level to prevent overcharging.
5. Protection Mode: Unit reduces or stops output if a fault is detected (overheat, battery disconnect, etc.). LED indicates fault type.

WARNING! Do not attempt to charge a deeply discharged (< 9V) or faulty battery, as this may trigger protection modes or cause damage.

Protection Features

Input Over-Voltage Protection: Shuts down if input voltage exceeds safe limit (e.g., >32V). Reverse Polarity Protection: Protects unit if battery cables are connected incorrectly. Over-Temperature Protection: Reduces charge current or shuts down if internal temperature is too high. Output Short-Circuit Protection: Limits current in case of a short on the auxiliary battery side. Low Voltage Disconnect (LVD): Isolates the auxiliary load if battery voltage drops too low (prevents deep discharge).

Care & Maintenance

Periodically inspect the unit and connections.

1. Visually check for corrosion, loose terminals, or damaged cables every 6 months.
2. Ensure the unit's ventilation area is clear of debris.
3. Clean exterior with a dry cloth only. Do not use water, solvents, or compressed air.
4. Check the auxiliary battery's water levels (if flooded type) and terminal condition.
5. Verify the system is operating correctly by observing the LED status during a charging cycle.

CAUTION! The unit contains no user-serviceable parts. Do not open the sealed housing. For internal issues, contact authorized service.

Regulatory Information

This device complies with relevant EMC standards for automotive environments. It is designed for off-road and auxiliary power applications. Redarc Electronics Pty Ltd owns all trademarks and intellectual property. For technical support, installation guides, and warranty information, visit www.redarc.com.au or contact your local Redarc distributor.

Troubleshooting

Symptom	Possible Cause	Corrective Action
LED is OFF	No input power, Blown fuse, Ignition not on	Check input connections and fuses. Verify ignition signal is present at IGN terminal.
LED Flashing Yellow	Input voltage too low	Check alternator/solar source voltage. Ensure cables are thick enough and connections are clean and tight.
LED Flashing Red	Fault condition (Over-temp, Over-voltage)	Allow unit to cool if hot. Check input voltage is not exceeding 32V. Disconnect power and reconnect to reset.
Auxiliary Battery not charging	Battery fully charged, Battery faulty, Incorrect DIP switch setting	Check battery voltage. Load the battery slightly to see if charger reactivates. Verify DIP switches match battery type.
Unit gets very hot	High ambient temperature, High charge current, Poor ventilation	Ensure unit is mounted in a cooler location with airflow. Charging may reduce automatically (derating) which is normal.
Solar input not working	Panel in shade, Faulty panel/regulator, Incorrect wiring	Check solar panel output voltage in sunlight. Verify wiring from panel to "SOLAR" input is correct and fused.

Reset: Disconnect all input and output power for 60 seconds, then reconnect.

Service & Support: www.redarc.com.au | Phone: +61 8 8322 4848