Photovoltaic power generation has appeared frequently in TV programs, buildings and houses around us, and there is a general consensus among the public about its identity as a green power generation. But as the saying goes, “red is right and wrong”, for photovoltaic power generation, the society has been continuously creating new rumors, so that many common people have misunderstanding about it, and even this industry to generate resistance. There is a black side will inevitably have red side to come forward immediately to defend, produce intense red and black game. On the social game is more common several issues, can ring treasure will be through several series of articles, one by one to expose those or good or bad false news, restore the truth.
Can photovoltaic power generation operate under cloudy and rainy weather?
This is a clichéd question. As the public knows, photovoltaic power generation depends on solar irradiation, so some people take it for granted that photovoltaic power cannot be generated in cloudy and rainy weather and spread rumors on the Internet. Of course, there are numerous counter-arguments, which are nothing more than saying that rain and snow are not affected and can generate electricity normally.
To address this issue, we need to re-examine how the term “irradiation” should be understood.
From the basic principle of photovoltaic power generation, the photoelectric effect refers to photons hitting the surface of the silicon-based solar cells, resulting in electrons squeezed out of the silicon atoms to form an electric current. So the process of photovoltaic power generation does not depend entirely on direct sunlight, but rather as long as there are enough photons to generate electricity. So this irradiation that shines through is photons.
So in cloudy and rainy weather, can photons penetrate the clouds or not? This question is perhaps more vocal for many fellow women who love to look good! Many women wear sunscreen all year round because of the short wavelength of high-energy ultraviolet light, which has a strong cloud penetration ability, and ultraviolet light is also a kind of photon, which can excite the electrons of photovoltaic modules.
However, it is undeniable that the thickness as well as the duration of the cloud layer determines the penetration ability of photons. According to some measured data, the power generation efficiency of PV system in normal cloudy weather is 70%-80% of that in sunny days. According to most areas of the average light 7 to 8 hours as a benchmark for calculation, if the cloud layer is thicker severe cloudy days, light only normal 1/4 of the time period.
For this conclusion, the National Energy Administration issued the “PV construction and operation of the hundred questions and answers (2022 version)”, there is also confirmed: photovoltaic cell module in a certain low light can also generate electricity. Distributed photovoltaic system and distribution grid is parallel operation, when distributed photovoltaic system can not meet the load demand or due to cloudy days and does not work, the grid power will automatically supplement over, there is no power shortage and power outage problem.
Having said that, a digression has to be introduced. In view of the authenticity of the photovoltaic power plant power generation, which is why the National Development and Reform Commission and the National Energy Board, had encouraged power users and new energy enterprises to sign the annual unit, or even a longer period of time of the green power trading contract. On the one hand, it is for power companies to avoid the risk of loss due to the above force majeure, on the one hand, it is also to enhance the competitive advantage of photovoltaic power generation enterprises.
Can photovoltaic power generation operate in extreme weather
Plus extreme weather, such as typhoons, hail, high temperature, etc., many people in the news must have seen the relevant reports, photovoltaic components in the climate of violence, was overturned, was penetrated, and even fire burned to the private house. So the extreme weather environment to game is not whether the photovoltaic system can operate, but whether the photovoltaic system can be safe. This requires consideration of the system's weather resistance, pressure resistance, etc., mainly focusing on the core components, brackets, inverters, etc..
The technological development of photovoltaic products does not only consider the reduction of kWh cost and the improvement of power generation efficiency, but also takes into account its service life in order to provide long-lasting benefits. LONGi's Hi-MO 5 modules are designed to withstand extreme environments such as typhoons. By controlling the module size to 2.6m2, keeping the module width at 1.13m, and optimizing the design and structure of the bezel, the wind load resistance of the module has been enhanced. LONGi also pays equal attention to other materials, such as the use of 2+2mm photovoltaic glass and 35mm bezel thickness to enhance the structural strength of the modules, combined with low-light decay technology to ensure safety and further ensure the improvement of power generation efficiency.
There are also many big brands whose modules are tested to the same stringent standards before they go on sale, as well as bracket brands and inverter brands. So that's why PV systems should choose quality-assured brands to work with in the early stages of construction.
In response to the topic of “photovoltaic power generation in cloudy and rainy or extreme weather can operate”, we still need to stand in a rational point of view to analyze the truth. Rainy days do have an impact, but this is not the norm. As a photovoltaic power generation enterprise, what can be done is in the construction of the early stage, rational layout, select quality products, minimize the risk, and attention to operation and maintenance, the weather changes have a high degree of vigilance, preventive measures before it is too late!
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