Preliminary Investigations of Outdoor Meteorological Broadband and Spectral Conditions for Evaluating Photovoltaic Modules and Systems

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Historically, flat-plate photovoltaic (PV) modules have been rated at "peak-output" for power generated under Standard; Reporting Conditions (SRC) of 1000 Watts per square meter W/m2 global irradiance at a standard temperature (25degC) and reference spectral distribution. We examine the direct-normal irradiance, spectral distribution, ambient temperature, and wind speed to be used for evaluating flatplate and concentrator module performance. Our study is based upon the 30-year U.S. National Solar Radiation Data Base for conditions observed when the global irradiance on a 2-axis-tracked surface is 1000 W/m2. Results show commonly-used values for concentrator testing of 850 W/m2 for direct-normal irradiance and 20degC ... continued below

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pp. 69-70

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Myers, D. R.; Kurtz, S. R.; Whitaker, C. & Townsend, T. January 1, 2000.

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Historically, flat-plate photovoltaic (PV) modules have been rated at "peak-output" for power generated under Standard; Reporting Conditions (SRC) of 1000 Watts per square meter W/m2 global irradiance at a standard temperature (25degC) and reference spectral distribution. We examine the direct-normal irradiance, spectral distribution, ambient temperature, and wind speed to be used for evaluating flatplate and concentrator module performance. Our study is based upon the 30-year U.S. National Solar Radiation Data Base for conditions observed when the global irradiance on a 2-axis-tracked surface is 1000 W/m2. Results show commonly-used values for concentrator testing of 850 W/m2 for direct-normal irradiance and 20degC for ambient temperature are appropriate. Wind speed should be increased from 1 m/s to a more frequently observed 4 m/s. Differences between the reference direct-normal spectrum and spectra measured at three sites when broadband direct-normal irradiance and global-normal irradiance are near SRC irradiances suggest revisions to the reference spectra may be needed.

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pp. 69-70

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  • Program and Proceedings: NCPV Program Review Meeting 2000, 16-19 April 2000, Denver, Colorado; NREL/BK-520-28064

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  • Report No.: None
  • Grant Number: AC36-99-GO10337
  • Office of Scientific & Technical Information Report Number: 909441
  • Archival Resource Key: ark:/67531/metadc883167

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 2000

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 30, 2016, 6:08 p.m.

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Myers, D. R.; Kurtz, S. R.; Whitaker, C. & Townsend, T. Preliminary Investigations of Outdoor Meteorological Broadband and Spectral Conditions for Evaluating Photovoltaic Modules and Systems, article, January 1, 2000; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc883167/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.