Learn how to troubleshoot and fix the Goodwe inverter Isolation Fault caused by water ingress.
Common causes include water ingress, damaged wiring, or faulty components. Inspect the junction box and connections.
Ensure proper sealing of junction boxes and install protective covers. Regular maintenance checks can help prevent issues.
The isolation fault is triggered when the inverter detects a failure in the insulation resistance (RISO) of the DC circuit. This is a protective measure to prevent electrical shock or fire hazards. The inverter continuously monitors the insulation resistance between the positive and negative conductors and the ground. If this resistance falls below a predetermined threshold, indicating a potential ground fault, the inverter will shut down to protect both the system and the user. This can happen due to water ingress, which compromises the insulation integrity of the wiring or components.
Homeowners may notice the inverter displaying an isolation fault error code, often indicated by a flashing LED or a specific alert on the monitoring app. Additionally, there may be a significant drop in energy production, with the inverter ceasing to feed power to the utility grid.
Always consult a licensed electrician or certified solar installer when troubleshooting or performing maintenance on solar equipment to ensure compliance with safety standards and local codes.
To prevent future isolation faults, ensure that the junction box is properly sealed during system and regularly inspect it for signs of wear or water ingress. Use high-quality, weather-resistant components and conduct routine maintenance checks on all electrical connections and cable insulation.