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

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**Describe the bug** name field of `modelchain.results.dc_ohmic_losses` is `i_mp` when it should be `p_something`. I would suggest the name `p_dc_ohmic_loss`. **To Reproduce** Steps to reproduce the behavior: 1. Run the...

**Is your feature request related to a problem? Please describe.** Some tracker manufacturers have implemented a diffuse irradiance optimization algorithm into their controls. The algorithm determines which angle the tracker...

enhancement

**Describe the bug** `vf_ground_sky_2d` considers one fewer sky wedge on the right side of the central wedge than it does on the left side. **To Reproduce** I added a line...

bug

**Is your feature request related to a problem? Please describe.** In case weather file doesn't have RH or Pwat, I would like to be able to use Tdew to calculate...

enhancement
documentation

Having the default transposition model be isotropic seems like a very poor choice. Isotropic models are known to have very large biases and should only be used in very specific...

enhancement

**Is your feature request related to a problem? Please describe.** pvlib provides three single diode models: CEC, PVSyst and De Soto, with the first two being of more interest. pvlib...

**Is your feature request related to a problem? Please describe.** I'm considering replacing [this PVSyst function](https://github.com/pvlib/pvlib-python/blob/8057393e6eaa57ca1ea60bc79205b94d00b33e42/pvlib/ivtools/sdm.py#L1270) with a more general function, like `temp_derivative(model='cec' or 'pvsyst', params=params, ...)` Work towards a...

- [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/main/docs/sphinx/source/reference) for API changes. - [x] Adds description and name entries in...

enhancement

Done: - [x] Closes #924 - [x] I am familiar with the [contributing guidelines](https://pvlib-python.readthedocs.io/en/latest/contributing.html) - [x] Tests added - [x] New code is fully documented. Includes [numpydoc](https://numpydoc.readthedocs.io/en/latest/format.html) compliant docstrings, examples,...

enhancement

- [x] Closes #1678 - [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/main/docs/sphinx/source/reference) for API changes. - [x] Adds description...

enhancement