Beijing Lewei IOT Technologies Co., Ltd.

Analysis of Common Faults of Solar Inverter

Although solar power generation system has a long service life, it is inevitable that there will be faults in the operation process. If your home is also equipped with solar power stations, will you solve the problems of the station or solar inverter data logger? If not, you may as well have a look at the complete collection of faults and the treatment methods compiled by the author.

1. The inverter screen is not displayed
Fault Analysis: Without DC input. Inverter LCD is powered by DC.
Possible causes:
(1) Insufficient voltage for component. The operating voltage of the inverter is 100V to 500V V. When it is lower than 100V, the inverter does not work. Module voltage is related to solar irradiance.
(2) PV input terminals are connected reversely. PV terminals have positive and negative poles, which should correspond to each other and cannot be connected reversely with other clusters.
(3) DC switch is not closed.
(4) When the components are connected in series, one joint is not connected properly.
(5) One component is short-circuited, causing other clusters to fail.

Solution: Measure the DC input voltage of the inverter with the meter voltage profile after use. When the voltage is normal, the total voltage is the sum of the voltages of all components. If there is no voltage, check whether the DC switch, wiring terminal, cable connector and components are normal in sequence. If there are multiple components, separate access tests are required. If the inverter is used for a period of time and no cause is found, the fault can be ascribed to the inverter hardware circuit. In this situation, we can contact with the manufacturer for after-sales service.

2. The inverter is not connected to the grid, and the screen shows that the mains supply is not connected.
Fault phenomenon: inverter is not connected to the grid, and the screen shows that the mains supply is not connected.
Fault Analysis: Inverter and grid are not connected
Possible causes:
(1) The AC switch is not closed.
(2) The AC output terminal of the inverter is not connected.
(3) During wiring, the upper row of inverter output terminals is loosened.

Solution: Measure the AC output voltage of the inverter with multimeter voltage file. Under normal circumstances, the output terminal should have a voltage of 220V or 380V V. If not, check whether the connection terminal is loose, whether the AC switch is closed and whether the leakage protection switch is open in turn.

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