Heatstroke is the sixth solar term in summer, from July 22 (or 23) to August 7 (or 8) every year. As the saying goes, “it’s hard to be hot in summer”. It’s also the period with the most sunshine and the highest temperature in China. This year’s heat stroke followed by the heat stroke, ushering in the hottest time of the year. The high temperature in many places hit 40 ℃, and the high temperature warning signal came into effect. In the face of such high temperature weather, how can our PV modules spend the summer cool?
Many people think that high temperature and sufficient sunshine can improve the power generation of photovoltaic modules. In fact, this is wrong. High temperature ≠ exposure does not have unity. Hot weather is caused by strong solar radiation reaching the earth’s surface.
At high temperature, the output power of solar cell module will decrease sharply with the increase of temperature, so that it can not play the maximum performance; High temperature is easy to make the panel failure, such as strengthening the hot spot effect, leading to aging and even damage of photovoltaic panels; For the inverter, when the temperature is too high, the full load operation state will easily lead to poor heat dissipation and affect the power generation; At the same time, the high temperature environment will greatly accelerate the loss rate of sensitive components. The water vapor generated in humid and high temperature environment will enter into the module through the sealing silica gel or back plate, inducing PID effect.
So, how to maintain photovoltaic modules in high temperature weather?
Maintain ventilation: whether it is components or inverter, distribution box and other equipment, should maintain air circulation. Do not increase the number of PV modules unreasonably in order to improve the power generation, causing mutual shielding between modules and affecting the ventilation and heat dissipation. In the design of power station, reliable service providers should be selected, and the most reasonable scheme should be designed according to the actual situation of the roof combined with the power generation.
Avoid accumulation of debris: make sure that the surroundings of photovoltaic modules, inverters, distribution boxes and other equipment are open and free from debris, so as not to affect the heat dissipation of the power station. If there are debris piled up beside the equipment, which cause shielding or pressure on the power station, it must be removed in time.
Proper cooling: in high temperature weather, the inverter and distribution box should be installed in the place of shading and rain shelter. If there is no shelter in the open air, it is better to install a canopy for them to avoid direct sunlight, so that the temperature of the equipment is too high, which will affect the power generation and service life of the equipment. If necessary, the equipment can be equipped with cooling fan.
In addition, in order to make the photovoltaic power station safely spend the summer and avoid the equipment failure caused by high temperature and possible disasters, regular inspection of photovoltaic modules is also essential
“External diagnosis”: touch the shell of the device to judge whether the temperature is too high, and feel whether the vibration of the device is normal. Do not touch the device directly with your palm when touching, so as to avoid scalding; Listen to the fan carefully to see if there is abnormal noise and smell if there is a burnt smell due to equipment failure. In addition, we also need to learn to check the equipment operation data, accurately judge whether there is any abnormal situation, and timely record the problems found, and inform the service provider to deal with them.
“Internal diagnosis”: measure the temperature of the equipment cable and shell through relevant tools, and judge the actual temperature and equipment conditions. Regular maintenance and inspection about the operation and maintenance personnel, if the abnormal high temperature weather continues, it is necessary to improve the inspection density and deal with the equipment abnormalities in time.