Learn about SolarEdge Error Code 18x7B indicatesting a ground fault and how to resolve it.
Error Code 18x7B indicates a ground fault detected in the system. This can lead to safety issues and requires immediate attention.
To troubleshoot a ground fault, check all wiring connections and inspect for any damaged cables. Ensure that the inverter is properly grounded.
The SolarEdge inverter employs advanced ground fault detection mechanisms to ensure system safety and reliability. When the inverter detects an abnormal condition that indicates a potential ground fault—often through insulation resistance (RISO) measurement—it triggers the fault code 18x7B. This is a protective measure to prevent damage to the inverter and the solar array. The inverter continuously monitors the DC side for any unintended paths to ground, which can occur due to insulation failure, moisture ingress, or damaged wiring. If the resistance falls below a predetermined threshold, the inverter assumes a ground fault is present and initiates a shutdown.
When the SolarEdge inverter triggers error code 18x7B, users typically observe a red LED indicator light on the inverter, signaling a ground fault condition. Additionally, monitoring apps may display a fault alert, and there may be a noticeable drop in energy production, as the inverter will enter a protective shutdown mode to prevent further damage.
Always consult a licensed electrician or certified solar installer before performing any maintenance or troubleshooting on your solar energy system.
To prevent future occurrences of error code 18x7B, ensure regular maintenance checks of the solar array and inverter components. Inspect wiring and connectors for wear and tear, and verify that all junction boxes are properly sealed against moisture. Implement proper system practices, including adequate grounding and protection against environmental factors.