pvlib.irradiance.louche#

pvlib.irradiance.louche(ghi, solar_zenith, datetime_or_doy, max_zenith=90)[source]#

Determine DNI and DHI from GHI using the Louche model.

Parameters:
  • ghi (numeric) – Global horizontal irradiance. [Wm⁻²]

  • solar_zenith (numeric) – True (not refraction-corrected) zenith angles in decimal degrees. Angles must be >=0 and <=90.

  • datetime_or_doy (numeric, pandas.DatetimeIndex) – Day of year or array of days of year e.g. pd.DatetimeIndex.dayofyear, or pd.DatetimeIndex.

Returns:

data (OrderedDict or DataFrame) – Contains the following keys/columns:

  • dni: the modeled direct normal irradiance. [Wm⁻²]

  • dhi: the modeled diffuse horizontal irradiance in Wm⁻².

  • kt: Ratio of global to extraterrestrial irradiance on a horizontal plane.

References