Changes in solar cell capacity under different ambient temperatures

by:Power Kingdom     2021-06-24
Label: Changes in solar cell capacity under different ambient temperatures. Search in the site: Generally speaking, as a finished solar cell, its capacity has been set when it leaves the factory. However, during use, it will be changed with the time and number of use. The battery capacity also has a certain impact. But does temperature really affect the capacity of lead-acid solar cells? Let's analyze the relationship between solar battery capacity and temperature: Ambient temperature -20℃ -10℃ 0℃ 5℃ 10℃ 20℃ 25℃ 30℃ 40℃ 45℃ Battery capacity 12V 50% 68% 78% 83% 90% 98 % 100% 102% 104% 105%  We can also use the formula to calculate, assuming that t1 and t2 are the temperature of the electrolyte, k is the temperature coefficient of the capacity, Ct1 is the capacity (Ah) when the temperature is t1, and Ct2 is the temperature when the temperature is t2 The capacity (Ah) is in the solar cell production standard, then the formula is:  Ct1u003d Ct2/1+k(t1-t2). Generally, it is necessary to specify a temperature as the rated standard temperature. For example, it is specified that t1 is the actual temperature, and t2 is the standard temperature (generally 25 degrees Celsius). The negative plate is more sensitive to the influence of low temperature than the positive plate. When the electrolyte temperature decreases, the electrolyte viscosity Increased, the ions receive greater resistance, the diffusion capacity decreases, and the electrolyte resistance also increases, which increases the resistance of the electrochemical reaction, and part of the lead sulfate cannot be converted normally. The charge acceptance capacity decreases, resulting in a decrease in the capacity of the solar cell.
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