pvlib.pvsystem.PVSystem.first_solar_spectral_loss#

PVSystem.first_solar_spectral_loss(pw, airmass_absolute)[source]#

Use pvlib.spectrum.spectral_factor_firstsolar() to calculate the spectral loss modifier. The model coefficients are specific to the module’s cell type, and are determined by searching for one of the following keys in self.module_parameters (in order):

‘first_solar_spectral_coefficients’ (user-supplied coefficients)
‘Technology’ - a string describing the cell type, can be read from the CEC module parameter database
‘Material’ - a string describing the cell type, can be read from the Sandia module database.

Parameters:

pw (array-like) – atmospheric precipitable water (cm).
airmass_absolute (array-like) – absolute (pressure corrected) airmass.

Returns:

modifier (array-like or tuple of array-like) – spectral mismatch factor (unitless) which can be multiplied with broadband irradiance reaching a module’s cells to estimate effective irradiance, i.e., the irradiance that is converted to electrical current.