Improved Field Evaluation of Reference Cell Using Spectral Measurements

Aron Habte, Manajit Sengupta, Frank Vignola, Josh Peterson, Richard Kessler, Vikram Sandhu

Research output: Contribution to conferencePaperpeer-review

3 Scopus Citations


Output from a reference solar cell mounted on a one-axis tracking surface is investigated using 350 nm to 1650 nm spectral irradiance measurements on selected days throughout the year. Comparisons are made to a Class-A pyranometer also mounted on the tracking surface. The ratio of the reference cell's measurements to reference pyranometer measurements exhibit systematic biases over the day and year. Most of this bias is linked to spectral, temperature, and angle-of-incident effects that differ for the reference cell and the pyranometer. The comparison is done for selected clear and totally cloudy days to determine the magnitude of the effects and to characterize they influence the measurements made with reference cells.

Original languageAmerican English
Number of pages8
StatePublished - Jun 2019
Event46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States
Duration: 16 Jun 201921 Jun 2019


Conference46th IEEE Photovoltaic Specialists Conference, PVSC 2019
Country/TerritoryUnited States

Bibliographical note

See NREL/CP-5D00-74037 for preprint

NREL Publication Number

  • NREL/CP-5D00-76349


  • one-axis tracker
  • pyranometer
  • Reference solar cells
  • resource assessment
  • spectral measurements


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