The inverter shows that there is no mains connection, which is a common alarm message. There are two reasons: one is the power failure of the grid, and the other is that the AC switch is disconnected. The inverter cannot detect the grid information, so it sends out an alarm message of "no mains connection", the inverter stops generating electricity, enters the islanding protection program, and waits for the grid to come in or the switch is closed before connecting to the grid.

In terms of operation, if the power grid is out of power, no manual operation is required, and the power grid can resume operation; if the AC switch is disconnected, a person needs to go to the site to detect what caused the switch to disconnect, find the cause of the fault, and eliminate the fault. Close the switch again. So, is there an easy way to tell if it's a grid outage or a switch disconnected?

Monitor from the mobile phone APP, enter the power station, find the alarmed inverter, click on the inverter parameters, and check the AC voltage of the inverter.

If the AC voltage is 0V, there may be a power failure in the power grid. If it is inconvenient to go to the site immediately, you can do nothing at this time and wait for the power grid to call. Of course, it is necessary to confirm whether it is the cause of the power failure.

If the AC voltage has a small amount of voltage, such as a few volts to a dozen volts, the AC switch is more likely to be disconnected, because the AC switch is disconnected, there will still be a little induced voltage between the contacts, the leakage switch and the open circuit with current detection There is a trip coil inside, and some residual voltage will be transmitted to the front end.