Learn about the Enphase error indicatesting low DC resistance after a storm and how to troubleshoot it effectively.
Low DC resistance can indicate potential issues with the inverter or wiring. It may lead to reduced efficiency or system failures.
You can check the DC resistance using a multimeter. Ensure the system is powered off before testing to avoid damage.
The inverter monitors the insulation resistance (RISO) of the DC circuit to ensure safety and proper operation. When RISO falls below a preset threshold, typically due to moisture or physical damage, the inverter triggers a fault to prevent potential electrical hazards. This is part of the ground fault detection mechanism that protects the system from dangerous conditions that could lead to short circuits or electric shocks.
After a storm, users may observe that the inverter's LED indicator is flashing a fault code, or the monitoring app may display an alert indicating "DC resistance too low." Additionally, there may be a noticeable drop in energy production, with the system showing little to no output despite optimal sunlight conditions.
Always consult a licensed electrician or certified solar installer when working with electrical systems to ensure compliance with safety standards and regulations.
To avoid this issue in the future, ensure that all connections are sealed and protected against moisture ingress. Regular maintenance checks, especially after severe weather events, can help identify potential issues before they become critical. Installing surge protectors can also mitigate damage from electrical surges during storms.