Learn about Solis Error Code UN-BUS01, its causes, and solutions for undervoltage issues.
Error Code UN-BUS01 indicates an undervoltage condition due to insufficient DC input from the solar panels. This can affect the inverter's performance.
To resolve the undervoltage issue, check the DC input from the solar panels. Ensure that they are receiving adequate sunlight and are not obstructed.
The UN-BUS01 error is triggered when the inverter detects that the DC input voltage from the solar array falls below its operational threshold. This can occur due to various electrical conditions. The inverter continuously monitors the input voltage and performs insulation resistance measurements (RISO) and ground fault detection to ensure safety and operational integrity. If the input voltage dips below the inverter’s minimum requirement, it enters a protective mode to prevent damage.
When the Solis inverter triggers the UN-BUS01 fault code, users may observe a flashing LED indicator on the inverter, signaling an undervoltage condition. Monitoring apps may display alerts indicating a drop in production, often correlating with low voltage readings. The system may also exhibit a complete halt in energy generation, leading to significant production losses.
Always consult a licensed electrician or certified solar installer when troubleshooting or performing maintenance on your solar system to ensure safety and compliance with local codes.
To avoid encountering the UN-BUS01 fault in the future, perform regular maintenance checks on the solar array, ensuring it is clean and free from obstructions. Regularly inspect wiring and connections for wear and tear, and ensure that inverter settings are correctly configured according to the array specifications. Additionally, consider installing monitoring systems that can alert you to performance issues before they lead to faults.