Learn how to troubleshoot Solis DC-INTF overcurrent issues after adding modules to a string.
Overcurrent can occur due to excessive current flow from added modules, exceeding inverter limits.
Ensure the total current from modules does not exceed the inverter's rated input specifications.
The Solis DC-INTF inverter has a maximum input current rating for each string. When additional modules are added, the total current may exceed this limit, triggering the inverter's protective mechanisms. This is often due to the inverter's built-in overcurrent protection, which is designed to prevent damage to both the inverter and the solar array. The electrical logic behind this involves the inverter monitoring the current flowing through the strings and comparing it against its rated specifications. If the current exceeds the threshold, the inverter will shut down to protect itself. Other factors, such as inadequate wire sizing or poor connections, can also contribute to increased resistance and, consequently, higher current draw.
After adding more modules to the string, users may observe the inverter displaying a fault code, or the LED indicator may flash rapidly, indicating overcurrent conditions. Additionally, monitoring apps may show a significant drop in production or indicate that the inverter is not operational.
Always consult a licensed electrician or certified solar installer when performing troubleshooting or repairs to ensure compliance with safety regulations and NEC standards.
To avoid this issue in the future, always consult the inverter's specifications before adding modules. Regularly inspect connections and ensure proper wire gauge is used to handle the expected current. Implement routine maintenance checks on modules and connections to detect potential issues before they escalate.