This document aims to provide users with troubleshooting guidance for common faults of REGO 12V 60A MPPT Solar Charge Controller (RCC60REGO).

Common problems with the REGO charger controller include：

• Battery low-voltage alarm
• Not charging
• Low charging current
• Battery over-voltage alarm
• PV over-voltage alarm

Below are the corresponding troubleshooting steps for different problems.

Battery Low-Voltage Alarm

Disconnect the connection between the controller and the battery, and test the actual voltage of the battery. If it is normal, it indicates a controller malfunction.

Not Charging

1. Observe the PV and battery voltage on the main interface of DC HOME. Determine if the battery is over-discharged and if the controller recognizes the PV.
2. If the PV is not recognized, first check the PV wiring for any reverse connections or other issues.
3. If the battery is not recognized, first check the battery wiring for any reverse connections or other issues. Once the wiring is confirmed to be correct, test the voltage to determine if the battery has been over-discharged.

Low Charging Current

1. Observe the battery voltage on the software to determine if the battery is fully charged and in the float charging stage. If it displays normally in that interface, it indicates normal operation.
2. Observe the current PV charging voltage and consider the PV system's connection method to determine if the PV input is functioning properly.
3. If there is an abnormality in the PV input, suggest you check if the PV is faulty, or consider changing the existing PV connection method.
4. Verify you have set the battery type and charging parameters correctly and reasonably.

Battery Over-Voltage Alarm

Disconnect the connection between the controller and the battery, and test the actual voltage of the battery. If it is normal, it indicates a controller malfunction. 
Note: If you are using lithium batteries and experiencing issues related to lithium peak voltage, the recommended troubleshooting process is as follows:

1. Inquire about the battery charging parameters and the parameters set within the controller to determine if they match.
2. Recommend to lower the charging voltage of the lithium battery to avoid the peak voltage alarm.

PV Over-Voltage Alarm

1. Inquire about your PV quantity, specifications, and connection method to determine if they exceed the standard limits.
2. If they are within the standard limits, test the open-circuit voltage of individual PV panels to determine if any of them are faulty.
3. Consider voltage fluctuations caused by the environment, especially during low temperatures in winter.

LED Indicator-based Troubleshooting

You can check the charge controller status by checking its LED indicators.