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Title: Comparison of Pyranometers and Reference Cells on Fixed and One-Axis Tracking Surfaces: Preprint

Abstract

A wide variety of sensors are used to monitor the irradiance incident on solar modules to evaluate the performance of photovoltaic (PV) systems. These instruments range from secondary standard pyranometers to photodiode-based pyranometers to reference cells. Although instruments are mounted in the plane of array of the modules, a wide range of results have been obtained. Some of these difference have been assumed to come from systematic uncertainties associated with the irradiance sensors. This study is an attempt to quantify these differences by comparing the output of selected thermopile pyranometers to photodiode-based pyranometers and reference cells on a horizontal surface, a fixed-tilt surface, and a one-axis tracking surface. This analysis focuses on clear-sky results from two sites with different climatic conditions. Several important features were observed. Photodiode-based pyranometers and reference cells produce widely different results under clear skies, especially at larger angles of incidence, even though both instruments are based on measuring the short-circuit current of solar cells. The difference is caused by the scattering of light as it passes through the glazing of the reference cell or the diffuser lens of the photodioded-base pyranometer. Both instruments are shown to have similar response to the spectral distribution of the irradiancemore » when compared to the thermopile-based pyranometer, which has a response nearly independent of the wavelength of light used by PV modules.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [2];  [3];  [2]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. University of Oregon
  3. Technological Educational Institute of Crete
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1414816
Report Number(s):
NREL/CP-5D00-70285
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the American Solar Energy Society Conference, 9-12 October 2017, Denver, Colorado
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; pyranometer; reference cell; one-axis tracking; solar; measurements

Citation Formats

Dooraghi, Michael R, Sengupta, Manajit, Vignola, Frank, Peterson, Josh, Mavromatakis, Fotis, and Chiu, Chun-Yu. Comparison of Pyranometers and Reference Cells on Fixed and One-Axis Tracking Surfaces: Preprint. United States: N. p., 2017. Web.
Dooraghi, Michael R, Sengupta, Manajit, Vignola, Frank, Peterson, Josh, Mavromatakis, Fotis, & Chiu, Chun-Yu. Comparison of Pyranometers and Reference Cells on Fixed and One-Axis Tracking Surfaces: Preprint. United States.
Dooraghi, Michael R, Sengupta, Manajit, Vignola, Frank, Peterson, Josh, Mavromatakis, Fotis, and Chiu, Chun-Yu. Tue . "Comparison of Pyranometers and Reference Cells on Fixed and One-Axis Tracking Surfaces: Preprint". United States. doi:. https://www.osti.gov/servlets/purl/1414816.
@article{osti_1414816,
title = {Comparison of Pyranometers and Reference Cells on Fixed and One-Axis Tracking Surfaces: Preprint},
author = {Dooraghi, Michael R and Sengupta, Manajit and Vignola, Frank and Peterson, Josh and Mavromatakis, Fotis and Chiu, Chun-Yu},
abstractNote = {A wide variety of sensors are used to monitor the irradiance incident on solar modules to evaluate the performance of photovoltaic (PV) systems. These instruments range from secondary standard pyranometers to photodiode-based pyranometers to reference cells. Although instruments are mounted in the plane of array of the modules, a wide range of results have been obtained. Some of these difference have been assumed to come from systematic uncertainties associated with the irradiance sensors. This study is an attempt to quantify these differences by comparing the output of selected thermopile pyranometers to photodiode-based pyranometers and reference cells on a horizontal surface, a fixed-tilt surface, and a one-axis tracking surface. This analysis focuses on clear-sky results from two sites with different climatic conditions. Several important features were observed. Photodiode-based pyranometers and reference cells produce widely different results under clear skies, especially at larger angles of incidence, even though both instruments are based on measuring the short-circuit current of solar cells. The difference is caused by the scattering of light as it passes through the glazing of the reference cell or the diffuser lens of the photodioded-base pyranometer. Both instruments are shown to have similar response to the spectral distribution of the irradiance when compared to the thermopile-based pyranometer, which has a response nearly independent of the wavelength of light used by PV modules.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 19 00:00:00 EST 2017},
month = {Tue Dec 19 00:00:00 EST 2017}
}

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