What is temperature characteristics of photovoltaic modules on the market?

Photovoltaic module is the core part of photovoltaic power generation system, its function is to convert solar energy into electric energy, and sent to stored in the storage battery, or promote work load. For photovoltaic modules, the output power is very important, so, photovoltaic cell components major

photovoltaic module is the core part of photovoltaic power generation systems. Its function is to convert solar energy into electrical energy, and sent to the storage battery, or promote work load. The output power is very important for photovoltaic modules, then what factors influence the big output power of photovoltaic modules? The temperature characteristics of photovoltaic module, photovoltaic components usually have three temperature coefficient: the open circuit voltage, short circuit current and peak power. When temperature increases, the output power of pv modules will be reduced. Mainstream of crystalline silicon pv modules on the market peak temperature coefficient is about - 0. 38 ~ 0. 44% / ℃, namely photovoltaic modules output at each temperature rise reduced about 0. 38%. However, the temperature coefficient of thin film solar cells is much better. For example, copper indium gallium selenide ( 香烟) The temperature coefficient is only - 0. 1 to 0. 3%, cadmium telluride ( CdTe) The temperature coefficient is about - 0. 25%, better than crystalline silicon cells. Second, aging attenuation long-term applications in photovoltaic modules, there will be a slow power attenuation. Attenuation value is about 3% a year, after 24 years of attenuation is about 0. 7%. According to this calculation, 25 years after the actual power of the photovoltaic modules can still be reached about 80% of the initial power. Aging decay, there are two main reasons: 1) Battery aging attenuation caused by the influence of the main types of battery and battery production process. 2) Packaging material attenuation mainly by the assembly process caused by aging, the environmental impact of packaging materials and the use of places. Ultraviolet light is the important reason for the main material degradation. Long-term exposure to the sun's ultraviolet rays to EVA and the back ( The structure of TPE) Aging and yellow, which results in the decrease of parts transmittance, resulting in lower power. In addition, cracking, hot and sand abrasion is to speed up common factor of the unit power attenuation. This requires components manufacturers when choosing EVA and the back to check on strictly, in order to reduce auxiliary components of power attenuation caused by material aging. 3. Components of the initial light photovoltaic module of the initial light to decay, namely the output power of photovoltaic modules in the first few days of its use is reduced greatly, but then stabilise. Different types of batteries have different degrees of light attenuation to: in the P type ( Boron doping) Crystalline silicon ( Single crystal/polysilicon) A chip, lighting or current injection lead to form boron - in silicon chip Oxygen is complex, which reduced the minority carrier lifetime, which makes some light to have a carrier composition, reduce the efficiency of battery and led to a light attenuation. Amorphous silicon solar cells, however, the photoelectric conversion efficiency in the use of the first six months will reduce greatly, will eventually be stable during the initial conversion efficiency of 70% ~ 85%. For HIT and CIGS solar cells, and almost no light attenuation. Four general, dustproof, shelter large photovoltaic power station built in gobi area, sandstorm, less rainfall. At the same time, the frequency of cleaning not too high. After long-term use, the efficiency loss of about 8%. Five, the component series does not match the pv module does not match the series, which can explain the visual effect of barrel. Is limited by short barrels of water content. Photovoltaic modules of output current is limited by serial components of low current. In fact, there will be some power deviation between components, so the mismatch between components will lead to some power loss.