Now photovoltaic power plants are highly sought after, both urban and rural areas can be seen. The problem has arisen. Some people say that the hotter photovoltaic power plants installed in high places generate high power. Some people say that too much heat has a negative effect on the output of photovoltaic power plants. So is the former? Is it justified or is the latter correct? Is photovoltaic power plant likes heat or heat?
Today we are going to talk about the relationship between temperature and photovoltaic power station on this topic.
The relationship between photovoltaic power plant and temperature is the same as clothes and people. The right clothes should be matched with the right person. If the clothes are too large or too small, it is awkward for the wearer. The reason of photovoltaic power station and temperature is also Thus, the effect of overheated environment on power generation can be counter-productive.
Here we can look at several sets of data: single-cell solar cell voltage decreases with increasing temperature, when the voltage temperature coefficient of -0.33% / ℃, the temperature increased by 1 ℃, 60 components of the solar cell Battery open-circuit voltage is reduced 120 ~ 125mv. Solar cell short-circuit current increases with temperature. Here also consider a battery parameter - peak power. This parameter decreases with increasing temperature, when the battery mounting ambient temperature per liter High 1 ℃, the peak power loss rate of solar cells is about 0.41%.
From a practical case, industry experts conclude that a polysilicon solar cell operating at 20 ° C will output about 20% more power than it does at 70 ° C. Conversely, if light conditions in a region are normal, The average temperature is lower, the overall power plant efficiency will be greatly enhanced.
In the tropics, the annual average temperature above 20 ℃ is a common problem.As the temperature increases, the photoelectric conversion efficiency is also declining, the power temperature coefficient is generally -0.4% / ℃ around If the common 2% 3% of the temperature loss, then the loss caused by high temperature in the tropics will reach about three times, the final impact is certainly the power generation capacity of the station.
In photovoltaic systems, photovoltaic modules are afraid of heat, and the same inverter is also afraid of heat. The inverter is composed of many electronic components. During operation, the main components will generate heat. In the design and development process, manufacturers in order to reduce the internal heat of the machine will The use of heat sinks, fans and other forms. If the inverter temperature is too high, the performance of components will be reduced, and then affect the inverter's overall life.
When photovoltaic power stations are installed in hot areas, it is not a good idea or an unwise behavior. It may happen that overheating produces no increase in power generation. Therefore, industry professionals usually do not do this. Of course, if the owners have special The demand is also another matter, such as off-grid PV systems in Africa as the main power supply because of the backwardness of power supply facilities.
