MPPT Solar Charge Controller Troubleshooting
Common Troubleshooting Issues
- LCD no display!
- Doesn't power on!
- The voltage read by the controller is quite different from the actual voltage of the battery.
- Controller NO Charging when battery NOT FULLYCHARGED
Troubleshooting Steps for LCD Display, Power-On, and Voltage Discrepancies (Issues 1, 2, 3)
- Check if the battery's connection is correct and reliable, ensuring no polarity inversion and that "+" and "-" are correctly connected.
- Verify that the fuse/breaker between the battery and controller is good.
- Check if the battery voltage is higher than 9V. If the battery voltage is lower than 8.5V, charge the battery to above 9V or replace it with a new battery with a voltage higher than 8.5V and continue the test. The controller cannot be powered on if the battery voltage is lower than 9V.
Note: If the multimeter reads the same voltage as your battery's true voltage, but the controller still exhibits the problem, please take a photo of the issue and email it with your order ID to cindy@ysolartech.com for warranty assistance.
Troubleshooting Steps for Charging Issues (Issue 5)
- Check if the connection is correct and reliable, ensuring no polarity inversion and that "+" and "-" are correctly connected.
- Verify that the fuse/breaker/connector between the PV and the controller is good.
- Check if the PV voltage is within the recommended range: VBat+2V < VPV < Range. Ensure your PV input voltage is within the recommended range and does not exceed the maximum power and voltage limits.
- Check if your PV voltage is higher than your battery's voltage. If the PV voltage is lower than the battery voltage, it cannot charge.
Note: If the PV voltage/power and battery voltage are normal, but the controller still doesn't charge, please take a photo of the issue and email it with your order ID to cindy@ysolartech.com. Technical support will assist you.
Work Mode Descriptions
| Working Mode | Description |
|---|---|
| 3.0 | Night mode, no charging |
| 4.0 | MPPT Charge mode |
| 7.0 | Absorption Charge mode |
| 8.0 | Floating Charge mode |
| 18 (ERROR) | Input PV voltage is low, please Increase the PV voltage |
| 60 (ERROR) | Over temperature protection |
| 63 (ERROR) | Protection-Battery voltage is high, Battery high voltage protection and wait for recovery |
| 65 (ERROR) | Battery voltage is low, Battery over discharge and wait for recovery |
| 71 (ERROR) | Input PV voltage is high, please Decrease the PV voltage |
| 73 (ERROR) | Over charging current, please Decrease the PV power |
Interface Description (Cycle)
The following displays are shown in sequence:
- 1. Battery TYPE: Displays the battery type.
- 2. Boost Voltage: Displays the boost charging voltage.
- 3. Float Voltage: Displays the float charging voltage.
- 4. Low Voltage Reconnect: Displays the voltage at which charging reconnects after a low voltage cutoff.
- 5. Constant Charge Voltage: Displays the constant charging voltage.
- 6. Charging Current: Displays the current charging current.
- 7. Temperature: Displays the controller's temperature.
- 8. Constant Charge Voltage Setting: Allows setting the constant charge voltage.
Button Functions
BAT button
- Function 1: Press the "Batt/up Button" to view the battery's value.
- Function 2: When the display shows Battery type/C-voltage, use the "up" and "down" buttons to adjust the value, then press "SET" to confirm and save.
PV button
- Press the PV button to browse PV voltage, PV current, and PV Power.
- The PV button is for viewing PV values only and has no setting function.
If you need more support or suggestions, please email us with your order ID. A team will work with you.
(Warranty email: cindy@ysolartech.com)
