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This summer, many places in our country have experienced the strongest high temperature process since there are complete meteorological observation records. The sun is so big and the temperature is so high. Many people think that the power generation efficiency of photovoltaic power plants will also increase accordingly. Is it true?

"Under continuous high temperature weather, the power output of photovoltaic modules shows a negative temperature coefficient relationship. The higher the temperature, the lower the output power, so the power generation will be reduced accordingly." Fan Guoyuan, secretary-general of Jiangsu Photovoltaic Industry Association who has long studied the development of the photovoltaic industry, said, The ideal operating temperature of photovoltaic power generation modules is about 25°C. For every 1°C increase in temperature, the output power will decrease by about 0.35%, and the power generation of photovoltaic power plants will also decrease by about 0.35%.

Affect the service life of the core components of the inverter
In the photovoltaic system, the photovoltaic modules are afraid of heat, and the inverter is also afraid of heat. The interior of the inverter is composed of many electronic components, and the main components will generate heat during operation. In order to reduce the internal heat of the machine, the manufacturer will use heat sinks, fans and other forms during the design and development process. If the temperature of the inverter is too high, the performance of the components will decrease, which will affect the life of the inverter. The problem of ventilation and cooling will be taken into consideration. At the same time, when laying wires and cables, and designing and installing arrays, it is necessary to consider whether the temperature can be used reasonably to avoid the negative impact of temperature on photovoltaic solar power plants.

The formation of hot spot effect affects the life of components
If the local temperature is too high, hot spots will be generated, which will affect the life of photovoltaic modules. Hot spot effect means that under certain conditions, the shaded solar cell module in a series branch will be used as a load to consume the energy generated by other illuminated solar cell modules, and the shaded solar cell module will heat up at this time . The hot spot effect will damage the solar cells to a certain extent. Part of the energy generated by the illuminated solar cells may be consumed by the shaded cells, and the hot spot effect of the photovoltaic power station will directly lead to a 30% reduction in the service life of photovoltaic modules. If things go on like this May cause component failure.

Generate PID effect and cause component failure
The PID effect, also known as potential-induced attenuation, is a phenomenon in which ion migration occurs under the action of high voltage between the packaging material of the battery module and its upper and lower surface materials, and the battery sheet and its grounded metal frame, resulting in attenuation of module performance. Improper cooling of photovoltaic power plants in high temperature weather is prone to PID effect, resulting in component failure.
Our country has a vast territory, and most of the various climate environments appear. As the temperature increases, the photoelectric conversion efficiency will also decrease. For example, in most parts of our country, due to the impact of climate and environment, there will be a common temperature loss of 2% or 3%, and the loss caused by high temperature in tropical areas will reach about three times the above, which directly leads to a reduction in the power generation of the power station. .

Photovoltaic power plants are easily affected by high temperature weather, which can be improved to a certain extent through reasonable system installation design. Ensure the ventilation and heat dissipation of modules, inverters, and distribution boxes, design and arrange them reasonably according to local conditions, remove dust from photovoltaic panels in time, ensure that there is no debris around the modules, and pay attention to cable maintenance, in order to achieve the best power generation revenue .