Outdoor rating conditions for photovoltaic modules and systems |
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Authors: | Sarah R. Kurtz Daryl Myers Tim Townsend Chuck Whitaker Alex Maish Roland Hulstrom K. Emery |
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Affiliation: | a National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401, USA;b Endecon Engineering, 2500 Old Crow Canyon Rd., Suite 220, San Ramon, CA 94583, USA;c Sandia National Laboratories, 1515 Eubank Blvd SE, Albuquerque, NM 87123, USA |
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Abstract: | Historically, flat-plate photovoltaic modules have been given a “peak-watt” rating indicating the power generated under 1000 W/m2 global irradiance at a standard temperature. However, questions have arisen regarding the direct-normal irradiance, ambient or cell temperature, and wind speed (when it is specified) that should be used for evaluating the performance of flat-plate and concentrator modules. By studying the conditions that are observed when the global irradiance on a 2-axis-tracked surface is 1000 W/m2, our analysis provides an objective, quantitative basis for the choice of the “peak-watt” rating conditions for both types of collectors. These observed conditions are consistent with commonly used values of 850 W/m2 for direct-normal irradiance and 20°C for ambient temperature. Evidence is given that wind speed should be increased from the commonly used 1 m/s to a more frequently observed 4 m/s. |
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Keywords: | Photovoltaic Cocentrator DNI Direct irradiance Module Rating Ambient temperature Wind |
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