Daily Inspection and Basic Maintenance
1. Electrical Connection Inspection: Check the DC and AC terminals at least once a month to ensure they are free of looseness, corrosion, or burns. According to the International Electrotechnical Commission (IEC 62446) standard, bolt torque must comply with the manufacturer's specifications (for example, some inverters require a DC terminal torque of 4-5 N·m).
2. Cooling System Maintenance: Clean the inverter's cooling fan and filter quarterly to prevent dust clogging and overheating (temperatures exceeding 60°C trigger derating). If the environment is dusty, cleaning frequency should be increased to monthly.
3. Appearance and Sealing: Check the chassis for deformation and aging of the waterproofing strips to prevent rainwater intrusion (IP rating must be maintained at IP65 or higher).
Cleaning, Maintenance, and Environmental Management
1. Panel and Radiator Cleaning: Wipe the chassis surface with a dry, soft cloth. Do not rinse directly with water. Dust accumulation on the heat sink can be removed with compressed air (pressure ≤ 0.3 MPa).
2. Ambient Temperature Control: The inverter's operating temperature should be maintained between -25°C and 60°C (refer to the Sungrow technical manual). A sunshade or forced ventilation should be installed in high-temperature environments.
3. Avoiding Obstructions and Corrosion: The installation location should be away from the shadows of trees. In coastal areas, choose a model that is salt spray-resistant (such as the SMA STP 50-40 inverter).
Troubleshooting and Data Monitoring
1. Alarm Code Handling: Common faults such as "low insulation resistance" (code Fault 18) may be caused by moisture. Disconnect the power supply and measure the string insulation resistance (normal value > 1 MΩ).
2. Remote Monitoring Setup: View power generation, efficiency, and other data in real time using a monitoring platform (such as the SolarEdge Monitoring Portal). If efficiency falls below 95%, investigate the cause.
3. Regular Professional Inspection: Entrust a service provider to perform IV curve scanning and internal component inspection every 6-12 months (capacitors with capacitance degradation exceeding 20% should be replaced).
Long-Term Maintenance and Upgrade Recommendations
1. Software Updates: Check the firmware version every six months. Newer firmware can improve efficiency (for example, a firmware upgrade can improve the MPPT accuracy of a Fronius inverter by 2%).
2. Parts Replacement Cycle: The fan lifespan is approximately 50,000-80,000 hours (refer to the ABB inverter manual). Preventive replacement is recommended every five years.
3. System Matching Optimization: When module power is over-specified, ensure that the inverter DC input does not exceed the specified limit (for example, the string voltage must not exceed 1000V).
