Small scale and scattered geological locations of distributed PV power stations make operation and maintenance tasks difficult. CECEP Solar Energy Technology Co. says it has a solution inherent in its new solar module to solve the O&M pain of clearing dust on the surface of PV modules. The impact would be most felt, according to its estimates, in areas with a large quantity of sand blown by the wind, such as California, which shows an annual 7 percent generated energy loss caused by sand and dust.
“Many people still misunderstand the operation and maintenance of distributed PV power stations,” said Wang Jun, General Manager of ANX Technology. “They think distributed power stations do not need operation and maintenance, which lead to disorderly management of power stations and dust blocking problem is severe in some power stations, which severely decreases the generated energy of the module. In addition, most industrial and commercial distributed roof power stations are constructed on color roofing, with large risks for operation and maintenance, missing inspection may occur and cleaning may not be completed properly.”
Dust is commonly removed by rain flushing the surface of the module, but as the frame of the module is higher than the glass, some dust will deposit on the frame bottom after flushing, and the accumulated dust will cover the cell and lead to a local hot spot effect. This not only severely influences the output efficiency of the module but also the high temperature will accelerate material breakdown and greatly reduce the service life of the module.
CECEP drainage solution
CECEP Solar Energy Zhenjiang Co.’s answer is the drainage module, which attempts to solve the problem of dust accumulation at the bottom of the module but also provides a self-cleaning function for the module. The so-called drainage module can effectively eliminate the influence of accumulated dust on the module, enhance generated energy of the power station and reduce the hot spot effect without influencing the performance of the module. Meanwhile, nano-modified material is used for the surface of the membrane to improve smoothness of the surface and reduce friction coefficient, making dust slip more easily; the combination of the self-cleaning membrane and antistatic effect can prevent accumulation of charge; dust will slip under the effect of dead weight and wind force, keeping the surface of PV module clean.
The research and development personnel of CECEP Solar Energy said: “Such a drainage module is more suitable for distributed power stations on color roofing. When modules are paved on the roof, they are not cleaned for a long time. Due to small installation inclination, dust is more likely to accumulate at the bottom. In severe cases, it may even block the cells of both rows, which will severely influence the generated energy. The drainage module developed by us will effectively solve the dust accumulation problem and increase generated energy of power stations. ”
In addition, application of the drainage module can greatly reduce the operation and maintenance cost of power stations.
CECEP Solar Energy Zhenjiang Company carried out the investigation for its drainage modules in 2016 and has currently completed the internal test and verification. The company is now able to manufacture the module in batches and plans to put it on the market this year.
— Solar Builder magazine