1. PV inverter indicator light is not displayed
Fault analysis: there is no DC input, and the inverter LCD is powered by DC.
2. The photovoltaic inverter is not connected to the grid, and the screen shows that the mains power is not connected
Fault phenomenon: the inverter is not connected to the grid, and the screen shows that the mains power is not connected
Fault analysis: inverter and power grid are not connected
3. The screen shows that the PV voltage is high
Fault analysis: high DC voltage alarm
4. The screen shows that the PV insulation impedance is too low
Fault analysis: the grounding insulation resistance of photovoltaic system is less than 2 megohm
5. The screen shows that the output leakage current is too high
Fault analysis: the leakage current is too large
6. The screen shows that the mains voltage is out of range
Fault analysis: the grid voltage is too high. The grid impedance increases, and the photovoltaic power generation user side cannot digest it. When it is transmitted out, the impedance is too large, resulting in too high voltage at the output side of the inverter, causing the inverter protection shutdown or derating operation.
