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Solar King

Troubleshooting Guide for Inverter Faults

System Fault

  1. Isolation Failure (Isolation Fault)

    • Description: Earth fault of the PV panels or failure of surge voltage protection.
    • Possible Causes: GFCI (Ground Fault Current Interrupter) activation indicates an isolation issue, possibly due to damaged PV panels or compromised surge protection.

  2. Ground Fault (GFCI Active)

    • Description: Ground Fault Current on ground conductor is too high.
    • Possible Causes: This fault occurs when the current flowing through the ground conductor exceeds safety thresholds, indicating a potential leakage or earth fault.

  3. Grid Failure (Grid Fault)

    • Description: Grid measured data is beyond the specification (voltage & frequency).
    • Possible Causes: This fault is triggered when grid voltage or frequency falls outside permissible limits, indicating instability or failure in the grid connection.

  4. Abnormal Grid Impedance (Impedance Fault)

    • Description:
      1. Grid impedance higher than the permissible value.
      2. Grid impedance change is higher than limit.
    • Possible Causes: High grid impedance or rapid changes in impedance can signal issues with grid stability or connectivity.

  5. No Grid Utility Voltage (No Utility)

    • Description:
      1. Inverter is not connected to the grid.
      2. Grid is absent.
    • Possible Causes: This fault occurs when there is no grid voltage detected, either due to the inverter not being properly connected to the grid or a complete grid outage.

Inverter Faults

  1. DC-Input Voltage Too High (PV Over Voltage)

    • Description: DC-Input voltage higher than the permissible 500V.
    • Possible Causes: This fault indicates that the voltage from the PV panels exceeds the inverter's maximum input voltage, potentially due to excessive sunlight or a configuration error.

  2. Consistent Failure (Consistent Fault)

    • Description: The readings of 2 microprocessors are not consistent. It is probably caused by CPU and/or other circuit not functioning well.
    • Possible Causes: A discrepancy in the readings from the inverter's microprocessors suggests a hardware malfunction, possibly in the CPU or related circuits.

  3. Bus Failure (DC Bus High / DC Bus Low)

    • Description: DC-Bus voltage too high or too low.
    • Possible Causes: This fault occurs when the DC bus voltage inside the inverter deviates significantly from the normal range, indicating issues with the inverter's power conversion process.

  4. Device Failure (Device Fault)

    • Description: The device is unable to return to normal status.
    • Possible Causes: A generic fault indicating the inverter cannot recover from an error condition, requiring further diagnostics or service.

  5. Temperature Too High (Over Temperature)

    • Description: The internal temperature is higher than the specified normal value.
    • Possible Causes: Overheating of the inverter, potentially due to inadequate ventilation, high ambient temperatures, or excessive load.

Models: SLK 1500 SLK 2000 SLK 3000 SLK 4000 SLK 6000

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