Use the sapm() function, the input parameters, and self.module_parameters to calculate Voc, Isc, Ix, Ixx, Vmp, and Imp.
sapm()
self.module_parameters
effective_irradiance (numeric or tuple of numeric) – The irradiance (W/m2) that is converted to photocurrent.
tuple
temp_cell (float or Series or tuple of float or Series) – The average cell temperature of cells within a module in C.
float
Series
See pvsystem.sapm for details
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