approximate (neglecting the shunt resistance) I— V equation of the solar cell array is given by: where /ph is the photocurrent, I„ is the reverse saturation current, R, the series resistance, I and V the array terminal current and voltage, K = q/AkT, q being the electron charge, A the completion factor, k Boltzmann's constant and T the absolute temperature. The solar cell array I— V equation as a function of cell temperature T, at a given insolation level, may be written as: where Tr is a given reference temperature, and a and are coefficients corresponding to a given solar cell. For a constant temperature and a variable insolation, G, the photocurrent is:
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