Diagnosing Model Errors in Simulations of Solar Radiation on Inclined Surfaces: Preprint

Research output: Contribution to conferencePaper


Transposition models have been widely used in the solar energy industry to simulate solar radiation on inclined PV panels. Following numerous studies comparing the performance of transposition models, this paper aims to understand the quantitative uncertainty in the state-of-the-art transposition models and the sources leading to the uncertainty. Our results suggest that an isotropic transposition model developed by Badescu substantially underestimates diffuse plane-of-array (POA) irradiances when diffuse radiation is perfectly isotropic. In the empirical transposition models, the selection of empirical coefficients and land surface albedo can both result in uncertainty in the output. This study can be used as a guide for future development of physics-based transposition models.
Original languageAmerican English
Number of pages6
StatePublished - 2016
Event43rd IEEE Photovoltaic Specialists Conference - Portland, Oregon
Duration: 5 Jun 201610 Jun 2016


Conference43rd IEEE Photovoltaic Specialists Conference
CityPortland, Oregon

NREL Publication Number

  • NREL/CP-5D00-66489


  • photovoltaic systems
  • solar energy


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