Learn how to troubleshoot SolarEdge Error Code 18xAB related to DC input overvoltage in cold weather conditions.
Error 18xAB typically occurs due to excessive DC input voltage, often exacerbated by cold weather. It's important to check the system's voltage levels.
To prevent DC input overvoltage, ensure proper installation and configuration of the solar panels. Regular maintenance checks can also help identify potential issues.
The SolarEdge inverter employs advanced voltage monitoring to protect itself and the solar array from overvoltage conditions. When the DC input voltage exceeds the inverter's maximum allowable threshold, the inverter triggers the 18xAB fault code. This can occur due to environmental factors, such as cold weather, which can increase the open-circuit voltage (Voc) of the solar modules beyond the inverter's rated input limits. Additionally, issues such as mismatched strings or faulty components can exacerbate this condition, leading to system shutdown to prevent damage.
Homeowners may observe the inverter's LED indicator flashing a specific pattern indicating an error state, accompanied by alerts in the monitoring app showing a drop in production. The inverter may also display a fault code 18xAB, indicating a DC input overvoltage issue.
Always consult a licensed electrician or certified solar installer for any work involving electrical systems to ensure safety and compliance with local codes.
To avoid this issue in the future, ensure that the solar array is designed with appropriate string configurations and that all components are rated for the expected voltage. Regular maintenance checks should be performed, especially before winter, to identify and rectify any potential issues that could lead to overvoltage conditions.