# Bifacial PV View Factor model
[](https://opensource.org/licenses/BSD-3-Clause)
[](https://travis-ci.org/NREL/bifacialvf)
[](https://zenodo.org/badge/latestdoi/114160149)
keywords: python, configuration factor model, electrical model mismatch for bifacial modules.
## Introduction
bifacialvf is a self-contained view factor (or configuration factor) model which
replicates a 5-row PV system of infinite extent perpendicular to the module
rows. The function returns the irradiance profile along the middle (interior)
row by default, but user interface options include `'first'`, `'interior'`,
`'last'`, and `'single'`. Single-axis tracking is supported, and hourly output
files based on TMY inputs are saved. Spatial nonuniformity is reported, with
multiple rear-facing irradiances collected on the back of each module row.
Bilinear interpolation code add-on to bifacialvf (description below) to pre-generate IV arrays and bifacial coefficients, and to examine the energy production with back side irradiance mismatch for either a portrait or landscape module.
Included are IV curves and bifacial info for a Yingli (standard) module.
## Pre-requisites
This software is written for Python 2 or 3. NREL recommends [Anaconda Python](https://www.anaconda.com/download/).
## Install using pip
[bifacialvf](https://pypi.org/project/bifacialvf/) is at the Python Package Index (PyPI). Use pip to install the latest release in your conda environment or virtualenv:
(myenv)$ pip install bifacialvf
### Install development mode from GitHub
For those interested in contributing to bifacialvf:
1. Clone the bifacialvf repository: `$ git clone https://github.com/NREL/bifacialvf.git bifacialvf-main`
2. Navigate to the repository directory where `setup.py` is located: `$ cd bifacialvf-main`
3. Install via pip in development mode: `$ pip install -e .`
## Usage
For usage examples, see the Jupyter notebooks in \docs\
## License
bifacialvf open source code is copyrighted by the Alliance for Sustainable Energy and licensed with BSD-3-Clause terms, found here.
## Citing bifacialVF
If you use bifacial_radiance in a published work, please cite:
Marion, B., MacAlpine, S., Deline, C., Asgharzadeh, A., Toor, F., Riley, D., … Hansen, C. (2017). A Practical Irradiance Model for Bifacial PV Modules: Preprint. In 44th IEEE Photovoltaic Specialists Conference. Washington, DC. https://www.nrel.gov/docs/fy17osti/67847.pdf. NREL/CP-5J00-67847
Please also cite the DOI corresponding to the specific version of bifacialVF that you used. bifacialvf DOIs are listed at [Zenodo.org](https://zenodo.org/search?page=1&size=20&q=conceptrecid:6369162&all_versions&sort=-version).
Silvana Ovaitt, Chris Deline, Mark Mikofski, & Nick DiOrio. (2022). NREL/bifacialvf: v0.1.8 Release (v0.1.8). Zenodo. https://doi.org/10.5281/zenodo.6369162
Bilinear Interpolation based on the publications:
De Soto, W., Klein, S. A., & Beckman, W. A. (2006). Improvement and validation of a model for photovoltaic array performance. Solar Energy, 80(1), 78–88. https://doi.org/10.1016/j.solener.2005.06.010
Marion, B., Rummel, S., & Anderberg, A. (2004). Current--voltage curve translation by bilinear interpolation. Progress in Photovoltaics: Research and Applications, 12(8), 593–607.
bifacialvf: Original code by Bill Marion, Python translation by Silvana Ayala, Updates by Chris Deline & team
Original bilinear interpolation code by Sara MacAlpine, Python translation & Updates by Silvana Ayala
PVMismatch add-on: PVmismatch code from [PVMismatch](https://github.com/SUNPower/PVMismatch), by Sunpower
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"description": "\r\r\n\r\r\n# Bifacial PV View Factor model\r\r\n[](https://opensource.org/licenses/BSD-3-Clause)\r\r\n[](https://travis-ci.org/NREL/bifacialvf)\r\r\n[](https://zenodo.org/badge/latestdoi/114160149)\r\r\n\r\r\nkeywords: python, configuration factor model, electrical model mismatch for bifacial modules.\r\r\n\r\r\n## Introduction\r\r\n\r\r\nbifacialvf is a self-contained view factor (or configuration factor) model which\r\r\nreplicates a 5-row PV system of infinite extent perpendicular to the module\r\r\nrows. The function returns the irradiance profile along the middle (interior)\r\r\nrow by default, but user interface options include `'first'`, `'interior'`,\r\r\n`'last'`, and `'single'`. Single-axis tracking is supported, and hourly output\r\r\nfiles based on TMY inputs are saved. Spatial nonuniformity is reported, with\r\r\nmultiple rear-facing irradiances collected on the back of each module row.\r\r\n\r\r\nBilinear interpolation code add-on to bifacialvf (description below) to pre-generate IV arrays and bifacial coefficients, and to examine the energy production with back side irradiance mismatch for either a portrait or landscape module. \r\r\nIncluded are IV curves and bifacial info for a Yingli (standard) module. \r\r\n\r\r\n## Pre-requisites\r\r\nThis software is written for Python 2 or 3. NREL recommends [Anaconda Python](https://www.anaconda.com/download/).\r\r\n\r\r\n## Install using pip\r\r\n[bifacialvf](https://pypi.org/project/bifacialvf/) is at the Python Package Index (PyPI). Use pip to install the latest release in your conda environment or virtualenv:\r\r\n\r\r\n (myenv)$ pip install bifacialvf\r\r\n\r\r\n### Install development mode from GitHub\r\r\nFor those interested in contributing to bifacialvf:\r\r\n\r\r\n1. Clone the bifacialvf repository: `$ git clone https://github.com/NREL/bifacialvf.git bifacialvf-main`\r\r\n2. Navigate to the repository directory where `setup.py` is located: `$ cd bifacialvf-main`\r\r\n3. Install via pip in development mode: `$ pip install -e .`\r\r\n\r\r\n## Usage\r\r\n\r\r\nFor usage examples, see the Jupyter notebooks in \\docs\\\r\r\n\r\r\n## License\r\r\nbifacialvf open source code is copyrighted by the Alliance for Sustainable Energy and licensed with BSD-3-Clause terms, found here.\r\r\n\r\r\n## Citing bifacialVF\r\r\n\r\r\nIf you use bifacial_radiance in a published work, please cite:\r\r\n\r\r\n Marion, B., MacAlpine, S., Deline, C., Asgharzadeh, A., Toor, F., Riley, D., \u2026 Hansen, C. (2017). A Practical Irradiance Model for Bifacial PV Modules: Preprint. In 44th IEEE Photovoltaic Specialists Conference. Washington, DC. https://www.nrel.gov/docs/fy17osti/67847.pdf. NREL/CP-5J00-67847\r\r\n\r\r\nPlease also cite the DOI corresponding to the specific version of bifacialVF that you used. bifacialvf DOIs are listed at [Zenodo.org](https://zenodo.org/search?page=1&size=20&q=conceptrecid:6369162&all_versions&sort=-version). \r\r\n\r\r\n Silvana Ovaitt, Chris Deline, Mark Mikofski, & Nick DiOrio. (2022). NREL/bifacialvf: v0.1.8 Release (v0.1.8). Zenodo. https://doi.org/10.5281/zenodo.6369162\r\r\n\r\r\nBilinear Interpolation based on the publications:\r\r\n\r\r\n De Soto, W., Klein, S. A., & Beckman, W. A. (2006). Improvement and validation of a model for photovoltaic array performance. Solar Energy, 80(1), 78\u201388. https://doi.org/10.1016/j.solener.2005.06.010\r\r\n\r\r\n Marion, B., Rummel, S., & Anderberg, A. (2004). Current--voltage curve translation by bilinear interpolation. Progress in Photovoltaics: Research and Applications, 12(8), 593\u2013607.\r\r\n\r\r\nbifacialvf: Original code by Bill Marion, Python translation by Silvana Ayala, Updates by Chris Deline & team\r\r\nOriginal bilinear interpolation code by Sara MacAlpine, Python translation & Updates by Silvana Ayala\r\r\nPVMismatch add-on: PVmismatch code from [PVMismatch](https://github.com/SUNPower/PVMismatch), by Sunpower\r\r\n\r\r\n\r\r\n",
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