Learn about the Enphase error code for low DC resistance, its causes, and solutions.
This error indicates that the DC resistance in the system is below acceptable levels, which can affect performance. It is crucial to check connections and components for faults.
Start by inspecting the wiring and connections for any signs of damage or corrosion. Additionally, ensure that all components are functioning correctly and within specifications.
The 'DC resistance too low' fault is triggered when the inverter detects an insulation resistance (RISO) measurement that falls below acceptable thresholds. This measurement is critical for ensuring that there are no unintended paths to ground, which could lead to ground faults. The inverter continuously monitors the insulation of the PV strings to ensure safe operation. When the insulation resistance dips, it suggests that there may be a fault in the system, such as a short circuit or moisture ingress, which poses safety risks. The inverter will then disable itself to prevent further damage or potential hazards.
Homeowners may observe the inverter displaying a fault code indicating 'DC resistance too low' on its LED indicators or monitoring app. This may be accompanied by a drop in energy production, as the inverter may cease operation to prevent damage. Visual inspection may reveal unusual LED patterns or alerts indicating a fault condition.
Always consult a licensed electrician or certified solar installer when troubleshooting electrical issues. Working on solar systems can pose serious risks, and licensed technician expertise is essential to ensure safety and compliance with local codes.
To avoid future occurrences of the 'DC resistance too low' fault, regularly inspect and maintain the array and wiring connections. Ensure that all components are rated for the environmental conditions they are exposed to, and perform routine insulation resistance testing as part of scheduled maintenance. Keep junction boxes sealed and protected from moisture ingress, and ensure that all grounding systems are intact and functioning correctly.