Objective Method for Selecting Outdoor Reporting Conditions for Photovoltaic Performance

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Outdoor performance of photovoltaic modules and systems depends on prevailing conditions at the time of measurement. Outdoor test conditions must be relevant to device performance and readily attainable. Flat-plate, nonconcentrator PV device performance is reported with respect to fixed conditions referred to as Standard Reporting Conditions (SRC) of 1 kW/m{sup 2} plane of array total irradiance, 25 C device temperature, and a reference spectral distribution at air mass 1.5 under certain atmospheric conditions. We report a method of analyzing historical meteorological and irradiance data to determine the range of outdoor environmental parameters and solar irradiance components that affect solar collector ... continued below

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Myers, D. R.; Kurtz, S. (National Renewable Energy Laboratory); Whitaker, C.; Townsend, T. (Endecon Engineering: San Ramon, California) & Maish, A. (Sandia National Laboratories: Albuquerque, New Mexico) February 25, 1999.

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Outdoor performance of photovoltaic modules and systems depends on prevailing conditions at the time of measurement. Outdoor test conditions must be relevant to device performance and readily attainable. Flat-plate, nonconcentrator PV device performance is reported with respect to fixed conditions referred to as Standard Reporting Conditions (SRC) of 1 kW/m{sup 2} plane of array total irradiance, 25 C device temperature, and a reference spectral distribution at air mass 1.5 under certain atmospheric conditions. We report a method of analyzing historical meteorological and irradiance data to determine the range of outdoor environmental parameters and solar irradiance components that affect solar collector performance when the SRC 1 kW/m{sup 2} total irradiance value occurs outdoors. We used data from the 30 year U.S. National Solar Radiation Data Base (NSRDB) , restricting irradiance conditions to within +/- 25 W/m{sup 2} of 1 kW/m{sup 2} on a solar tracking flat-plate collector. The distributions of environmental parameter values under these conditions are non-Gaussian and site dependent. Therefore the median, as opposed to the mean, of the observed distributions is chosen to represent appropriate outdoor reporting conditions. We found the average medians for the direct beam component (834 W/m{sup 2}), ambient temperature (24.4 C), total column water vapor (1.4 cm), and air mass (1.43) are near commonly used SRC values. Average median wind speed (4.4 m/s) and broadband aerosol optical depth (0.08) were significantly different from commonly used values.

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  • Presented at the American Solar Energy Society Solar 99 Conference, Portland, ME (US), 06/12/1999--06/15/1999

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  • Other: DE00007098
  • Report No.: NREL/CP-520-26229
  • Grant Number: AC36-99-GO10337
  • Office of Scientific & Technical Information Report Number: 7098
  • Archival Resource Key: ark:/67531/metadc711333

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  • February 25, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 28, 2016, 8:33 p.m.

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Myers, D. R.; Kurtz, S. (National Renewable Energy Laboratory); Whitaker, C.; Townsend, T. (Endecon Engineering: San Ramon, California) & Maish, A. (Sandia National Laboratories: Albuquerque, New Mexico). Objective Method for Selecting Outdoor Reporting Conditions for Photovoltaic Performance, article, February 25, 1999; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc711333/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.