Learn about Growatt Error Code 203, its meaning, causes, and solutions for PV isolation issues.
Error Code 203 indicates a low PV isolation issue, often caused by humidity or moisture affecting the system's performance.
To troubleshoot, check the PV isolation resistance and ensure that the installation area is dry and free from moisture.
Error 203 indicates a low insulation resistance condition detected by the inverter's internal diagnostics. Insulation resistance (RISO) is crucial for ensuring that there are no unintended paths for current to ground, which can lead to safety hazards and reduced efficiency. The inverter monitors this resistance to prevent ground faults that could jeopardize system integrity and safety. When humidity levels are high, such as in the morning, moisture can compromise insulation, leading to lower resistance values and triggering this fault.
Homeowners may observe the inverter displaying Error 203 on the monitoring app or directly on the inverter screen. LED indicators may show a fault condition, typically blinking red or yellow. Additionally, there may be a noticeable drop in energy production, with the system failing to produce expected output during sunlight hours.
Always consult a licensed electrician or certified solar installer when performing maintenance or troubleshooting on your solar system to ensure safety and compliance with local codes.
To avoid encountering Error 203 in the future, regularly inspect and maintain the PV array and inverter. Schedule periodic cleaning of the panels to prevent dirt accumulation and ensure all electrical connections are secure and free from corrosion. Additionally, consider installing a weatherproof enclosure for outdoor junction boxes to mitigate moisture ingress.