Learn about Growatt Error Code 121, its meaning, causes, and troubleshooting solutions for high bus voltage issues.
Error Code 121 indicates that the bus voltage is too high, which can lead to system malfunctions. It's crucial to address this issue promptly to ensure optimal performance.
To troubleshoot high bus voltage, check the inverter settings and ensure proper connections. Additionally, inspect the system for any overvoltage conditions that may be affecting performance.
Error 121 indicates that the inverter has detected a bus voltage that exceeds its operational limits. This can occur when the input voltage from the solar array surpasses the inverter's maximum allowable input voltage, often due to excessive solar irradiance or high ambient temperatures. The inverter continuously monitors the DC voltage levels using internal sensors. If the voltage exceeds a pre-defined threshold, the inverter triggers this fault to prevent damage to its internal components, ensuring safe operation. The system may also check for insulation resistance and ground faults, which can contribute to voltage irregularities.
Upon encountering Error 121, users will typically observe the inverter display showing a fault indicator, often accompanied by a flashing LED pattern. Monitoring applications may also send alerts indicating a bus voltage issue, and overall energy production may drop significantly as the inverter shuts down to protect itself from potential damage.
Always consult a licensed electrician or certified solar installer when diagnosing or repairing electrical issues to ensure safety and compliance with local codes.
To avoid encountering Error 121 in the future, conduct regular maintenance checks on the solar array and inverter. Ensure that the string configuration adheres to the manufacturer's specifications. Monitor environmental conditions and adjust the system configuration as necessary during peak solar production times. Implement surge protection devices to mitigate the impact of external voltage spikes.