def test_clearsky_ghi_fixed(clearsky, solarposition):
"""Identify every day as fixed, since clearsky GHI is sunny."""
assert orientation.fixed_nrel(
clearsky['ghi'],
solarposition['zenith'] < 87,
r2_min=0.94,
).all()
def test_perturbed_ghi_fixed(clearsky, solarposition):
"""If the clearsky for one day is perturbed then that day is not sunny."""
ghi = clearsky['ghi']
ghi.iloc[0:24] = 1
expected = pd.Series(True, ghi.index)
expected[0:24] = False
assert_series_equal(expected,
orientation.fixed_nrel(ghi,
solarposition['zenith'] < 87),
check_names=False)
def test_stuck_tracker_profile(solarposition, clearsky):
"""Test POA irradiance at a awkward orientation (high tilt and
oriented West)."""
poa = irradiance.get_total_irradiance(
surface_tilt=45,
surface_azimuth=270,
**clearsky,
solar_zenith=solarposition['apparent_zenith'],
solar_azimuth=solarposition['azimuth'])
assert not orientation.tracking_nrel(
poa['poa_global'],
solarposition['zenith'] < 87,
).any()
# by restricting the data to the middle of the day (lower zenith
# angles) we should classify the system as fixed
assert orientation.fixed_nrel(poa['poa_global'],
solarposition['zenith'] < 70).all()