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Update tracking.py Tracking Misalignment offser for One Axis #2316

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Update tracking.py Tracking Misalignment offser for One Axis #2316

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10 changes: 8 additions & 2 deletions pvlib/tracking.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,8 @@

def singleaxis(apparent_zenith, apparent_azimuth,
axis_tilt=0, axis_azimuth=0, max_angle=90,
backtrack=True, gcr=2.0/7.0, cross_axis_tilt=0):
backtrack=True, gcr=2.0/7.0, cross_axis_tilt=0
offset=0):
"""
Determine the rotation angle of a single-axis tracker when given particular
solar zenith and azimuth angles.
Expand Down Expand Up @@ -84,6 +85,11 @@ def singleaxis(apparent_zenith, apparent_azimuth,
positive cross-axis tilt if the tracker axes plane slopes down to the
west. Use :func:`~pvlib.tracking.calc_cross_axis_tilt` to calculate
``cross_axis_tilt``. [degrees]
offset : float, default 0.0
is an additional angle that causes a delay/advance of the tracking
position over the the ideal true tracker_theta angle before
.calc_surface_orientation
``offset``. [degrees]

Returns
-------
Expand Down Expand Up @@ -143,7 +149,7 @@ def singleaxis(apparent_zenith, apparent_azimuth,
axis_azimuth=axis_azimuth,
solar_zenith=apparent_zenith,
solar_azimuth=apparent_azimuth,
)
) + offset

# filter for sun above panel horizon
zen_gt_90 = apparent_zenith > 90
Expand Down