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Raise ValueError if PVSystem constructed with 0 Arrays #1224

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Merged
merged 4 commits into from
May 17, 2021
Merged

Raise ValueError if PVSystem constructed with 0 Arrays #1224

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e2add94
Raise ValueError if PVSystem constructed with 0 Arrays
wfvining May 10, 2021
6fca2ae
Reword description of `arrays` param to PVSystem
wfvining May 17, 2021
9ffc3aa
Reword ValueError raised when arrays is empty
wfvining May 17, 2021
1845894
Add Raises section to PVSystem docstring
wfvining May 17, 2021
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8 changes: 7 additions & 1 deletion pvlib/pvsystem.py
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,8 @@ class PVSystem:
arrays : iterable of Array, optional
List of arrays that are part of the system. If not specified
a single array is created from the other parameters (e.g.
`surface_tilt`, `surface_azimuth`). If `arrays` is specified
`surface_tilt`, `surface_azimuth`). Must contain at least one Array,
if empty a ValueError is raised. If `arrays` is specified
the following parameters are ignored:

- `surface_tilt`
Expand Down Expand Up @@ -210,6 +211,11 @@ def __init__(self,
racking_model,
array_losses_parameters,
),)
elif len(arrays) == 0:
raise ValueError("PVSystem must have at least one Array. "
"If you want to create a PVSystem instance "
"with a single arbitrary default Array pass "
"`arrays=None`.")
else:
self.arrays = tuple(arrays)

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6 changes: 6 additions & 0 deletions pvlib/tests/test_pvsystem.py
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Expand Up @@ -2084,6 +2084,12 @@ def test_PVSystem_num_arrays():
assert system_two.num_arrays == 2


def test_PVSystem_at_least_one_array():
with pytest.raises(ValueError,
match="PVSystem must have at least one Array"):
pvsystem.PVSystem(arrays=[])


def test_combine_loss_factors():
test_index = pd.date_range(start='1990/01/01T12:00', periods=365, freq='D')
loss_1 = pd.Series(.10, index=test_index)
Expand Down