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Is it true that the higher the temperature, the more electricity a photovoltaic power plant can generate?

2022-08-24View Original

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Is it true that the higher the temperature, the more electricity that photovoltaic power plants can generate, which has led to excellent performance for related companies in the first half of this year? According to several industry insiders in the photovoltaic sector, the optimal operating temperature for photovoltaic power plants is between 23°C and 24°C. Under normal ambient temperatures, photovoltaic panels typically come with a 30-year warranty; their power output decreases by no more than 2% in the first year, and by no more than 0.45% each subsequent year. Thus, a 600-watt panel can still maintain an output of over 500 watts after 30 years. The standard temperature for photovoltaic modules is 25°C; for every 1°C increase in the ambient temperature, the temperature coefficient of TOPCon cells decreases by 0.32%, while that of PERC cells decreases by 0.37%. The current persistent high temperatures of 40°C do have an impact on the operation of photovoltaic power plants; for example, there is a higher likelihood of failures in various electrical equipment including cables. However, the main factors affecting the power generation capacity of these plants are the efficiency of system maintenance and the duration of sunlight exposure. The former refers to the efficiency with which repairs can be carried out in case of failures, while the latter is related to the season and whether it is raining or not. ” High temperatures do not mean an increase or decrease in the duration of daylight. Although temperatures are high in summer, there is plenty of rainfall, which may lead to a decrease in power generation. The optimal seasons generally refer to spring and autumn, when there is less rainfall and longer periods of daylight. At the same time, higher altitudes also increase power generation, as in regions such as the Qinghai-Tibet Plateau and the Loess Plateau; this is because higher altitudes result in less annual rainfall and longer periods of sunlight. In terms of the production cycle, the photovoltaic industry can be divided into periods of high activity and periods of low activity. In previous years, it was said that electricity generation was higher at temperatures in the low 20s degrees Celsius and lower at temperatures in the high 30s degrees Celsius, as weather at those higher temperatures is characterized by more rainfall. This year, it clearly didn’t rain when it should have, which will increase the profitability of power generation.
Reply #22022-09-16
Photovoltaic power generation operates within a specific temperature range; it’s not the case that higher temperatures result in more electricity production. When temperatures are too high, the resistance to the movement of charge carriers through the semiconductor lattice increases, which affects the efficiency of power generation.
Reply #32022-10-05
The new energy section is finally open; I’ll come here often to learn more*
Reply #42022-10-06
The effective utilization time of photovoltaic systems per year is around 1,200 hours, while that of wind turbines is around 3,000 hours. It is important to combine photovoltaic and wind energy; usually, strong winds occur in winter, when the efficiency of photovoltaic systems is low. In summer, when winds are weak, the efficiency of photovoltaic power generation is higher. Therefore, it is necessary to combine these two energy sources, and they also need to be connected to the grid to ensure stability. Even with energy storage systems in place, off-grid operation is not very reliable.
Reply #52022-10-07
Mature energy storage methods do not necessarily mean high reliability of green electricity.

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