Learn about the Enphase DC Resistance Too Low ISO Fault, its causes, and solutions for effective troubleshooting.
DC Resistance Too Low indicates an issue with the inverter's internal resistance, which can affect performance. It may require inspection of connections and components.
To troubleshoot, check the wiring and connections for any damage or loose contacts. Ensure that the inverter is properly grounded and functioning within specifications.
The Enphase inverter triggers a 'DC Resistance Too Low ISO Fault' when it detects that the insulation resistance (RISO) of the DC circuits falls below acceptable levels. This measurement is critical for ensuring safety and performance; low resistance can indicate potential ground faults or short circuits. The inverter continuously monitors the insulation resistance to prevent electrical hazards, such as shock risks or fire. When the resistance is too low, it signifies that the system may not be adequately insulated, prompting the inverter to shut down to avoid damage or danger.
Homeowners may notice the inverter's LED indicator flashing a fault code or a specific alert displayed on the monitoring app, indicating a DC resistance issue. Additionally, production may drop significantly, leading to reduced energy generation, which can be alarming for users tracking their solar output.
Always consult a licensed electrician or certified solar installer when working on electrical systems to ensure safety and compliance with local codes.
To avoid this issue in the future, regularly inspect your solar array for signs of wear and tear, particularly in wiring and connections. Ensure that all components are rated for the environmental conditions they are exposed to and maintain proper system practices. Scheduling periodic maintenance checks with a certified solar installer can also help catch potential issues early.