code: def sapm_celltemp(self, irrad, wind, temp):
          
          return sapm_celltemp(irrad, wind, temp, self.racking_model)
docs: Uses :py:func:`sapm_celltemp` to calculate module and cell
          temperatures based on ``self.racking_model`` and
          the input parameters.
  
          Parameters
          ----------
          See pvsystem.sapm_celltemp for details
  
          Returns
          -------
          See pvsystem.sapm_celltemp for details