Proposal and Evaluation of Subordinate Standard Solar Irradiance Spectra: Preprint

Aron Habte, Stefan Wilbert, Wilko Jessen, Chris Gueymard, Jesus Polo, Zeqiang Bian, Anton Driesse, Aitor Marzo, Peter Armstrong, Frank Vignola, Lourdes Ramirez

Research output: Contribution to conferencePaper


This paper introduces a concept for global tilted irradiance (GTI) subordinate standard spectra to supplement the current standard spectra used in solar photovoltaic applications as defined in ASTM G173 and IEC60904. The proposed subordinate standard spectra correspond to atmospheric conditions and tilt angles that depart significantly from the main standard spectrum, and they can be used to more accurately represent various local conditions. For the definition of subordinate standard spectra cases with an elevation 1.5 km above sea level, the question arises whether the air mass should be calculated including a pressure correction or not. This study focuses on the impact of air mass used in standard spectra, and it uses data from 29 locations to examine which air mass is most appropriate for GTI and direct normal irradiance (DNI) spectra. Overall, it is found that the pressure-corrected air mass of 1.5 is most appropriate for DNI spectra. For GTI, a non-pressure-corrected air mass of 1.5 was found to be more appropriate.
Original languageAmerican English
Number of pages15
StatePublished - 2018
EventInternational Solar Energy Society Solar World Congress - Abu Dhabi, United Arab Emirates
Duration: 29 Oct 20172 Nov 2017


ConferenceInternational Solar Energy Society Solar World Congress
CityAbu Dhabi, United Arab Emirates

NREL Publication Number

  • NREL/CP-5D00-70318


  • air mass
  • efficiency rating
  • solar spectra
  • spectral response
  • standardization


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