Learn how to troubleshoot and fix low PV isolation issues with Growatt 203 in rainy conditions.
Low PV isolation can occur due to moisture affecting the electrical connections. It's important to inspect the system for water ingress.
Ensure all connections are properly sealed and consider using weatherproof enclosures for sensitive components.
The Growatt 203 inverter employs insulation resistance (RISO) measurements to ensure the safety and performance of the photovoltaic (PV) system. During operation, the inverter continuously checks the insulation resistance between the array and ground. If moisture infiltrates the system, it can lower the insulation resistance value, triggering the inverter's ground fault detection mechanism. This safety feature prevents potential electric shock hazards and equipment damage by disconnecting the inverter from the grid when isolation levels drop below acceptable thresholds.
When experiencing low PV isolation in the rain, users may notice the inverter's LED indicators displaying warning patterns, such as blinking red lights or a continuous alarm. The monitoring app may report a drop in energy production or an isolation fault alert. Additionally, there may be a complete shutdown of the inverter until the fault is resolved.
Always ensure that any troubleshooting or repairs are performed by a licensed electrician or certified solar installer to comply with safety standards and local codes.
To prevent low isolation issues in the future, ensure that all junction boxes are properly sealed and rated for outdoor use. Regularly inspect the array and wiring for any signs of wear, especially after severe weather events. Consider installing protective measures, such as conduit or weatherproof enclosures, to safeguard electrical connections from moisture exposure.