code: def pvwatts_dc(self, g_poa_effective, temp_cell):
          
          kwargs = _build_kwargs(['temp_ref'], self.module_parameters)
  
          return pvwatts_dc(g_poa_effective, temp_cell,
                            self.module_parameters['pdc0'],
                            self.module_parameters['gamma_pdc'],
                            **kwargs)
docs: Calcuates DC power according to the PVWatts model using
          :py:func:`pvwatts_dc`, `self.module_parameters['pdc0']`, and
          `self.module_parameters['gamma_pdc']`.
  
          See :py:func:`pvwatts_dc` for details.