Learn about Sungrow Error Code 021, its meaning, causes, and solutions for high leakage current issues.
Error Code 021 indicates that the leakage current in the inverter is too high, which can pose safety risks and affect performance.
To troubleshoot this error, check the grounding connections and ensure that all wiring is intact and properly insulated.
Error 021 indicates that the inverter has detected a leakage current that exceeds the acceptable threshold. This condition is primarily assessed through insulation resistance measurements (RISO). When the inverter senses high leakage current, it triggers a fault to safeguard both the system and the utility grid. Ground fault detection mechanisms within the inverter continuously monitor the integrity of the electrical connections, and any deviation from normal operating parameters results in a protective response. The inverter's internal logic evaluates grounding conditions and electrical isolation, which are critical for safe operation.
Homeowners may observe the inverter displaying Error 021 on the monitoring app or physical LED indicators. This error typically accompanies a significant drop in energy production, as the inverter may enter a protective shutdown mode to prevent damage. The monitoring interface may also show abnormal voltage or current readings, indicating potential issues with the array or wiring.
Always consult a licensed electrician or certified solar installer when dealing with inverter issues or electrical systems to ensure safety and compliance with local codes.
To prevent recurrence of Error 021, conduct regular maintenance checks on the array, inverter, and wiring. Ensure that all components are rated for the environmental conditions and that grounding practices are in accordance with NEC guidelines. Periodically inspect for moisture ingress and replace any damaged components promptly. Additionally, consider implementing surge protection devices to mitigate potential overvoltage scenarios.