Maintenance of solar inverter: the structure and electrical connection of inverter should be intact, and there should be no corrosion, dust accumulation and other phenomena. The heat dissipation environment should be good, and there should be no big vibration and abnormal noise when the inverter is running. Warning signs on the inverter shall be intact. The cooling fans of modules, reactors and transformers in the frequency converter should be started and stopped automatically according to the temperature, and there should be no big vibration and abnormal noise when the cooling fans are running. If there is any abnormality, the power supply should be turned off for inspection. Disconnect the AC output side (network side) circuit breaker once regularly, and the inverter shall immediately stop feeding the power grid. The capacitor temperature of DC bus in frequency converter is too high or exceeds its service life, so it should be replaced in time.