Experiments and data have shown that dust adhering to solar panels for more than six months can reduce power generation efficiency by 15~50% . One gram of dust per square meter may result in an annual revenue loss of up to 400 euros for a ten kilowatt photovoltaic system.
It has been confirmed in Australia that due to energy losses caused by dust, a 1.5 KW grid connected photovoltaic system experiences an annual energy loss of 113.54 kWh , equivalent to 300 kWh per day, calculated based on on-site degradation patterns at the end of each season. A 50 watt household solar energy system experiences an annual energy loss of 7.1 kWh, equivalent to 19.5 kWh per day.
The main forms of dust on solar panels are:
1. Floating ash: This is the dust form of most power stations before rain, the dust form is smooth, uniform and loose, such dust is easy to clean, and the dry-brush robot is particularly prominent in this type of power station.
2.Solid dust:This form of dust is more common in the area of organic pollution or chemical pollution, dust after rain This form of dust is more common in organic pollution or chemical pollution areas, dust after rain infiltration of the spot form, once the formation of such dust is difficult to clean, long-term do not clean these dust on the component surface coating and glass erosion, resulting in irreversible power generation loss of the power station.
3. Adhesive dust: This kind of dust is mainly the dust formed after rain infiltration of loose form of dust, which is not easy to clean up without human intervention. Easy to clean in case of rain or water. Therefore, the rain-linked automatic cleaning robot can greatly improve the power generation of the power station.
4. Saline-alkali dust: This kind of dust is mainly the long-term accumulation of dust in seaside power stations, especially after rain infiltration, such dust is also extremely difficult to clean when there is water, easy to cause corrosion of the glass substrate, resulting in irreversible power generation loss. Therefore, timely daily cleaning becomes important.
The obstruction of dust not only changes the direction of light irradiation, reduces the transmittance of glass panels, and affects system efficiency, but long-term dust obstruction can also form hot spots and damage solar panels. Dust includes pollen, pollutants, smoke, sand, dust, other microorganisms, etc. Therefore, even if not located in desert areas, there are many factors that affect the transparency of the glass on the surface of photovoltaic panels, thereby reducing power generation efficiency.
The results indicate that the percentage decrease in solar transmittance is closely related to dust deposition, as well as to the tilt angle of the panel, exposure time, and on-site climate conditions. It is strongly recommended to make weekly cleaning of solar panels a regular part of maintenance in other adjacent areas of the desert from the Atlantic to the Persian Gulf, as well as in areas with moderate dust. However, equipment should be cleaned immediately after sandstorms to maintain the efficient operation of solar panels.
Post time: Dec-09-2024