Abstract
The impact of illuminance on changes of the solar cell electromotive force is analyzed. A mathematical model for a solar cell electromotive force dependence on illuminance is presented. For this purpose, a selection of experimental data trend function was carried out, and the Pearson correlation coe cients were established. The most optimal results were obtained in case of an exponential function with the strongest correlation (R = 0.983). The analysis has shown that at 100 W/m illuminance the electromotive force saturation is obtained (the electromotive force changes insigni cantly and uctuates at around 2 V), which indicates that upon reaching such an illuminance a solar cell operates at maximum e ciency. A rst-order di erential equation satis ed by the trend function has been compiled. When interpreting illuminance as an evolution variable, the proposed mathematical model can be interpreted as a dynamical system. The deviation frequency spectrum of the measurement values with respect to the theoretical prediction is analyzed.
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