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And the cooking temperature of some solar ovens is fairly low, in the range of 250 to 300 degrees F. If is is rainy or very cloudy, you cannot cook using a solar oven even during the middle of the day. There is not enough energy from the sun on cloudy days to cook using a typical solar oven.
1 In a solar cell, the parameter most affected by an increase in temperature is the open-circuit voltage. 2  As the temperature increases, the open-circuit voltage decreases, thereby decreasing the fill factor and finally decreasing the efficiency of a solar cell.3  It is recommended to operate at 25 degree celsius. In addition to reflecting the performance of the solar cell itself, the efficiency depends on the spectrum and intensity of the incident sunlight and the temperature of the solar cell. 2  The efficiency of a solar cell is determined as the fraction of incident power, which is converted to electricity and is defined as: