Performance Analysis of Transposition Models Simulating Solar Radiation on Inclined Surfaces

Research output: NRELPoster


Transposition models have been widely used in the solar energy industry to simulate solar radiation on inclined photovoltaic panels. Following numerous studies comparing the performance of transposition models, this work aims to understand the quantitative uncertainty in state-of-the-art transposition models and the sources leading to the uncertainty. Our results show significant differences between two highly used isotropic transposition models, with one substantially underestimating the diffuse plane-of-array irradiances when diffuse radiation is perfectly isotropic. In the empirical transposition models, the selection of the empirical coefficients and land surface albedo can both result in uncertainty in the output. This study can be used as a guide for the future development of physics-based transposition models and evaluations of system performance.
Original languageAmerican English
StatePublished - 2016

Publication series

NamePresented at the European PV Solar Energy Conference and Exhibition (EU PVSEC), 20-24 June 2016, Munich, Germany

NREL Publication Number

  • NREL/PO-5D00-66573


  • National Renewable Energy Laboratory
  • NREL
  • photovoltaic
  • PV
  • solar panels
  • solar radiation
  • transposition models


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