The PV inverter screen does not display

Fault analysis: There is no DC input. The inverter LCD is powered by DC.

Possible reasons:

(1) The component voltage is insufficient. The inverter working voltage is 100V to 500V. When it is lower than 100V, the inverter does not work. The component voltage is related to the solar irradiance.

(2) The PV input terminal is connected in reverse. The PV terminal has positive and negative poles. They must correspond to each other and cannot be connected in reverse with other strings.

(3) The DC switch is not closed.

(4) When the components are connected in series, one of the connectors is not connected properly.

(5) One component is short-circuited, causing other strings to fail to work.

Solution: Use the voltage range of the meter to measure the DC input voltage of the inverter. When the voltage is normal, the total voltage is the sum of the voltages of each component. If there is no voltage, check whether the DC switch, terminal, cable connector, components, etc. are normal. If there are multiple components, they should be connected separately for testing. If the inverter has been used for a period of time and no cause is found, it is the inverter hardware circuit that has failed. You can contact the manufacturer's after-sales service.