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Merits and issues associated with correcting data measured under natural sunlight to a reference spectrum are discussed. Corrections based on the measured spectral irradiance are compared with corrections based on the current at an absolute air mass of 1.5 for direct and global sunlight. As expected, corrections based on the absolute air mass are most accurate when the reference spectrum is close to the "AM 1.5" spectrum at the test site. Spectral modeling allows an estimate of the sensitivity of the spectrum at AM 1.5 to water vapor and turbidity. The error in the air-mass correction procedure is less than +/2% for silicon. Seasonal variations in the air-mass correction factor because of variations in the turbidity and water vapor and sensitivity to cell technology are also discussed.

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Authors: EMERY K, National Renewable Energy Laboratory (US);ZAAIMAN W, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT)
Bibliographic Reference: An oral report given at: 29th IEEE Photovoltaic Specialists Conference Organised by: Institute of Electrical and Electronics Engineers (IEEE) Held at: New Orleans (US), 20-24 May 2002
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