The power generation efficiency of solar panels will decrease due to the weakened light intensity on foggy days, but the stable operation of the system can still be guaranteed through targeted maintenance measures. The following are the core points of maintenance on foggy days:
Waterproof and moisture-proof treatment for equipment: On foggy days with high air humidity, it is necessary to pay special attention to checking the sealing performance of equipment such as component junction boxes and inverters to prevent water vapor from entering and causing short circuits or insulation failure. It is recommended to use junction boxes and connectors with a protection level of IP67 or above, and install moisture-proof silicone or desiccant inside the equipment. Replace them regularly to maintain a dry environment.
Anti-pollution flashover and insulation monitoring: Tiny water droplets in the fog may adhere to the surface of the components to form a conductive layer, increasing the risk of pollution flashover. The dirt on the surface of the components needs to be cleaned regularly to prevent dust from combining with water vapor to form a conductive film. Meanwhile, use an insulation resistance tester to test the insulation performance of the equipment, ensuring that the grounding resistance is ≤4Ω to prevent equipment damage caused by insulation decline.
Dynamic optimization of power generation efficiency: On foggy days, the intensity of light fluctuates greatly, and the parameters of the inverter need to be adjusted in real time through an intelligent monitoring system. For example, set the MPPT (Maximum Power Point Tracking) sensitivity to the highest level to ensure that the inverter can respond quickly to changes in light. In addition, the duration of foggy days can be predicted by combining meteorological data, and the charging and discharging strategies of the energy storage system can be adjusted in advance to ensure power supply for critical loads.
Component cleaning and hot spot prevention: After foggy days, the surface of the components should be cleaned in time to avoid the deposition of minerals in the fog water and the formation of stubborn stains. It is recommended to use a soft scraper and deionized water for cleaning to prevent the glass from being scratched. Meanwhile, an infrared thermal imager is used to detect the temperature distribution of the components. If local overheating (with a temperature higher than the average by more than 20℃) is found, it is necessary to check for obstruction or damage to the battery cells to prevent the intensification of the hot spot effect.
System redundancy and emergency support: For areas with continuous foggy days, it is recommended to configure energy storage systems or backup power sources (such as diesel generators) to ensure stable power supply. The SOC (State of Charge) of the energy storage system should be maintained at 50%-70% to avoid excessive charging and discharging, which may shorten the battery life. Meanwhile, an emergency response mechanism should be established. When the power generation is 30% lower than the historical average for the same period, the backup power supply should be immediately activated and system faults should be investigated.
Through the above measures, the power generation efficiency of solar panels on foggy days can be increased by 5% to 10%, and the stability of the system is significantly enhanced. It is recommended to conduct a maintenance effect assessment once every quarter based on meteorological data and historical power generation records, and dynamically optimize the maintenance strategy.
