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Use k and cap_adjustment from Array.module_parameters in PVSystem.pvwatts_dc #2715

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Use k and cap_adjustment from Array.module_parameters in PVSystem.pvwatts_dc #2715

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c29129d
Update _build_kwargs call in PVSystem.pvwatts_dc to include 'k' and '…
fuma900 Mar 11, 2026
8437f39
Add 'k' and 'cap_adjustment' parameters to module_parameters in pvwat…
fuma900 Mar 11, 2026
9b1e59b
Add enhancement entry in v0.15.1 release notes and add contributor
fuma900 Mar 11, 2026
1d94dc7
Update docstring in PVSystem.pvwatts_dc
fuma900 Mar 11, 2026
c8af675
Fix linting failure
fuma900 Mar 11, 2026
2e312c1
Fix linting failure
fuma900 Mar 11, 2026
ef33f9c
Update docstring in PVSystem.pvwatts_dc
fuma900 Mar 11, 2026
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4 changes: 3 additions & 1 deletion docs/sphinx/source/whatsnew/v0.15.1.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,8 @@ Bug fixes

Enhancements
~~~~~~~~~~~~

* Use ``k`` and ``cap_adjustment`` from :py:func:`pvlib.pvsystem.Array.module_parameters` in :py:func:`pvlib.pvsystem.PVSystem.pvwatts_dc`
(:issue:`2714`, :pull:`2715`)
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@RDaxini RDaxini Mar 11, 2026

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Suggested change
(:issue:`2714`, :pull:`2715`)
(:issue:`2714`, :pull:`2715`)

You can add a line here to reduce the diff, which is what we would normally do. Not essential though


Documentation
~~~~~~~~~~~~~
Expand Down Expand Up @@ -70,4 +71,5 @@ Contributors
* Anton Driesse (:ghuser:`adriesse`)
* Kevin Anderson (:ghuser:`kandersolar`)
* Rohan Saxena (:ghuser:`r0hansaxena`)
* Marco Fumagalli (:ghuser:`fuma900`)

8 changes: 6 additions & 2 deletions pvlib/pvsystem.py
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Expand Up @@ -850,7 +850,10 @@ def pvwatts_dc(self, effective_irradiance, temp_cell):
"""
Calculates DC power according to the PVWatts model using
:py:func:`pvlib.pvsystem.pvwatts_dc`, `self.module_parameters['pdc0']`,
and `self.module_parameters['gamma_pdc']`.
`self.module_parameters['gamma_pdc']`,
`self.module_parameters['temp_ref']`, and optionally,
`self.module_parameters['k']` and
`self.module_parameters['cap_adjustment']`.

See :py:func:`pvlib.pvsystem.pvwatts_dc` for details.
"""
Expand All @@ -860,7 +863,8 @@ def pvwatts_dc(self, effective_irradiance, temp_cell):
pvwatts_dc(effective_irradiance, temp_cell,
array.module_parameters['pdc0'],
array.module_parameters['gamma_pdc'],
**_build_kwargs(['temp_ref'], array.module_parameters))
**_build_kwargs(['temp_ref', 'k', 'cap_adjustment'],
array.module_parameters))
for array, effective_irradiance, temp_cell
in zip(self.arrays, effective_irradiance, temp_cell)
)
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3 changes: 2 additions & 1 deletion tests/test_pvsystem.py
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Expand Up @@ -2260,7 +2260,8 @@ def pvwatts_system_defaults():

@pytest.fixture
def pvwatts_system_kwargs():
module_parameters = {'pdc0': 100, 'gamma_pdc': -0.003, 'temp_ref': 20}
module_parameters = {'pdc0': 100, 'gamma_pdc': -0.003, 'temp_ref': 20,
'k': 0.01, 'cap_adjustment': True}
inverter_parameters = {'pdc0': 90, 'eta_inv_nom': 0.95, 'eta_inv_ref': 1.0}
system = pvsystem.PVSystem(module_parameters=module_parameters,
inverter_parameters=inverter_parameters)
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