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A set of documented functions for simulating the performance of photovoltaic energy systems.

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- [x] Closes #1481 - [x] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [ ] Tests added - ~~[ ] Updates entries in [`docs/sphinx/source/reference`](https://github.com/pvlib/pvlib-python/blob/master/docs/sphinx/source/reference) for API changes.~~ - [...

io
remote-data

- [x] Closes #925 - [x] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [x] Tests added - [ ] Updates entries to [`docs/sphinx/source/api.rst`](https://github.com/pvlib/pvlib-python/blob/master/docs/sphinx/source/api.rst) for API changes. - [ ]...

enhancement

- [x] Closes #1310 - [x] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [x] Tests added - [x] Updates entries in [`docs/sphinx/source/reference`](https://github.com/pvlib/pvlib-python/blob/master/docs/sphinx/source/reference) for API changes. - [x] Adds description...

enhancement
io
remote-data

**Problem** There's less international weather data **Solution** Add `get_nrel_suny()`, `read_`, & `parse_` to use the the [SUNY international data API from NREL](https://developer.nrel.gov/docs/solar/nsrdb/suny-india-data-download/) **Additional context** Check out the NREL NSRDB docs...

enhancement
io

New to solar, so please bear with me. **Is your feature request related to a problem? Please describe.** It's much easier and intuitive to create string IV curves when the...

# Problem Currently pvlib supports the DeSoto physical model (similar to normal glass), ASHRAE, Martin & Ruiz, and SAPM polynomial, but it doesn't have a pure Fresnel model that allows...

This builds off of pull request #1251 to add the changes suggested in the conversation there and wrap it up. - [x] Closes #1246 - [x] I am familiar with...

enhancement

It would be nice to be able to supply `atol` and/or `rtol` to [pvlib.conftest.assert_frame_equal](https://github.com/pvlib/pvlib-python/blob/f2d14cea0bd20dfbafdbc375bf1285b67ea78e60/pvlib/tests/conftest.py#L40). For any pandas > 1.1, current behavior sets either `atol, rtol = [1e-3, 1e-3]` or `atol,...

testing

**Describe the bug** I'm getting some issues with irradiance.clearsky_index() with mixed datatypes on inputs. Specifically, clearsky_ghi is often a pandas Series. If working with a ghi input that shares an...

- [ ] Closes #1442 - [ ] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [ ] Tests added - [ ] Updates entries in [`docs/sphinx/source/reference`](https://github.com/pvlib/pvlib-python/blob/master/docs/sphinx/source/reference) for API changes....