Learn how to troubleshoot and resolve SolarEdge Error Code 18x78 effectively.
Error Code 18x78 typically indicates an internal hardware fault within the inverter. This may require inspection or replacement of components.
Regular maintenance and monitoring can help prevent hardware faults. Ensure proper ventilation and check for any signs of wear or damage.
The SolarEdge inverter triggers the error code 18x78 when it detects an internal hardware fault, which can stem from various electrical logic failures. The inverter continuously monitors insulation resistance (RISO) and performs ground fault detection to ensure safe operation. If the insulation resistance falls below the acceptable threshold, or if there is a significant ground fault, the inverter will shut down to protect itself and the solar array. Additionally, fluctuations in grid frequency or voltage can also contribute to hardware faults, leading the inverter to enter a fault state.
Homeowners may notice the inverter displaying an error code 18x78 on the monitoring app or via LED indicators. This may be accompanied by a significant drop in energy production, with the inverter showing a status of 'Not Operating' or 'Fault'. The monitoring app may also provide alerts regarding hardware issues.
Always ensure that a licensed electrician or certified solar installer conducts repairs and maintenance on the inverter to avoid electrical hazards.
To avoid encountering error code 18x78 in the future, ensure regular maintenance checks on the inverter and solar array. This includes inspecting connections for moisture and corrosion, testing insulation resistance periodically, and keeping the inverter clean and free from debris. Additionally, monitor the system’s performance through the app to catch anomalies early.