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15 changes: 11 additions & 4 deletions pvlib/irradiance.py
Original file line number Diff line number Diff line change
Expand Up @@ -294,13 +294,20 @@ def total_irrad(surface_tilt, surface_azimuth,
model='isotropic',
model_perez='allsitescomposite1990', **kwargs):
r"""
Determine diffuse irradiance from the sky on a tilted surface.
Determine total in-plane irradiance and it's beam, sky diffuse and ground
reflected components, using the specified sky diffuse irradiance model.

.. math::

I_{tot} = I_{beam} + I_{sky} + I_{ground}
I_{tot} = I_{beam} + I_{sky diffuse} + I_{ground}

See the transposition function documentation for details.
Sky diffuse models include:
* isotropic (default)
* klucher
* haydavies
* reindl
* king
* perez

Parameters
----------
Expand Down Expand Up @@ -333,7 +340,7 @@ def total_irrad(surface_tilt, surface_azimuth,

Returns
-------
irradiance : OrderedDict or DataFrame
total_irrad : OrderedDict or DataFrame
Contains keys/columns ``'poa_global', 'poa_direct', 'poa_diffuse',
'poa_sky_diffuse', 'poa_ground_diffuse'``.
"""
Expand Down