Learn about Growatt Error Code 129, its meaning, causes, and solutions for DC injection issues.
Error Code 129 indicates that the DC injection level is too high, which can affect system performance and safety.
To troubleshoot, check the inverter settings, inspect wiring for faults, and ensure proper grounding to prevent excessive DC injection.
The Growatt inverter triggers error 129 when it detects that the DC injection into the inverter is too high. This condition is typically assessed through internal monitoring of the DC voltage levels relative to the inverter's maximum input specifications. If the insulation resistance (RISO) measurement indicates that the DC voltage exceeds safe operational limits, the inverter will enter a protective state to prevent damage. This fault may also arise from ground fault detection mechanisms that identify unbalanced currents, which can lead to hazardous conditions. The inverter is designed to ensure that any excess DC voltage does not feed back into the utility grid, thus protecting both the system and the grid from potential damage.
Users may observe the inverter displaying error 129 on its screen, accompanied by a flashing LED indicator. In some cases, the monitoring app may alert the user to a significant production drop or abnormal operational status. Additionally, the inverter may not produce any power during this fault condition, indicating a halt in energy conversion from the solar array.
Always ensure that a licensed electrician or certified solar installer performs troubleshooting and repairs to guarantee compliance with local electrical codes and safety standards.
To prevent future occurrences of error 129, regularly inspect the solar array for debris and shading, maintain clean connections, and ensure proper grounding is consistently applied. Additionally, periodically evaluate the system configuration against the inverter's specifications to avoid overproduction scenarios.