How to solve the problem that the photovoltaic inverter shows no mains connection

Fault phenomenon: The inverter is not connected to the grid, and the screen shows that the mains is not connected.

Fault analysis: The inverter is not connected to the grid.

Possible reasons:

(1) The AC switch is not closed.

(2) The AC output terminal of the inverter is not connected.

(3) When wiring, the upper row of the inverter output terminal is loose.

Solution: Use the voltage range of the multimeter to measure the AC output voltage of the inverter. Under normal circumstances, the output terminal should have a voltage of 220V or 380V. If not, check whether the terminal is loose, whether the AC switch is closed, and whether the leakage protection switch is disconnected.