User Manual for Rich Solar RS-DC Series DC-DC Battery Charger

Quick Guide

The Rich Solar RS-DC Series battery chargers are designed to charge auxiliary or house batteries from an alternator or starter battery. They feature a 3-stage charging process and are compatible with AGM, Flooded, GEL, Sealed, Lithium-iron Phosphate, and Lithium-ion 12V batteries. The unit includes built-in protections against over-voltage, over-temperature, and reverse polarity.

Safety Instructions

Warning: Risk of electric shock, fire, or injury. Follow these safety guidelines:

• Use only with 12V battery banks.
• Ensure positive and negative terminals do not touch.
• Install in a dry, cool, and well-ventilated area.
• Do not operate in environments with explosion risks, corrosive fumes, or high dust levels.
• Disconnect the product from the battery before cleaning or making circuit changes.
• Do not attempt to repair the charger yourself.

Installation

For optimal performance, ensure the charger is mounted as close as possible to the auxiliary battery. Maintain at least 5cm (1.97 inches) of clearance on all sides for ventilation. Secure the unit to a surface using 4 screws.

Wiring and Fusing

The installer is responsible for using correct cable and fuse sizes. Prioritize shorter, thicker wires to minimize voltage drop. The system requires a common negative ground point.

D+ Ignition Wiring

The charger will not operate until the D+ ignition cable is connected to a 12V ignition source. This ensures the charger only runs when the vehicle's engine is running, preventing the starter battery from draining. Use 18-16AWG solid copper cable for this connection.

LC Current Limit Wiring

Connecting the LC terminal to a 12V power supply limits the charger to 50% of its rated current. This is optional and can be connected to the same ignition source as the D+ wire.

Operation

The charger features a mode selection switch to set the battery type (STD, GEL, AGM, LFP). Ensure the switch is set to the correct battery type before operation. The unit includes an LED indicator to signal faults.

Troubleshooting

If the charger is not functioning, check the LED status:

• Red Fault LED ON: Indicates a fault such as Battery Overvoltage, Battery Undervoltage, Polarity Reverse, or High Temperature. Refer to the troubleshooting section to measure voltages and check wiring.
• ALL Indicator LED OFF: Often caused by an incorrect D+ connection or a connection break. Verify the D+ signal and check all wiring and fuses.

Maintenance

Periodically inspect wiring for cracks, wear, or corrosion. Ensure all terminals remain tight, as vehicle vibrations can loosen connections. Keep the unit free of dust and ensure ventilation remains unobstructed.

Technical Specifications

The RS-DC series is available in 20A, 40A, and 60A models. All models operate on a 12VDC nominal input voltage with an operating range of 10-16VDC. Efficiency is rated at >85% at 14VDC with a 30% load.