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Title: Low irradiance losses of photovoltaic modules

Abstract

Here, the efficiency of a photovoltaic cell/module changes, as the intensity of incident irradiance decreases, in a non linear way and these changes are referred to as low irradiance losses. In this study data from field experiments, developed and organized by the National Renewable Energy Laboratory, are used to evaluate the low irradiance losses for a variety of module technologies. The results demonstrate that the ratio of the normalized power divided by the normalized short circuit current provide a good measure of the module's low light efficiency losses after both the maximum power and the short circuit current are adjusted for temperature effects. The normalized efficiencies determined through the field data, spanning for several months, are in good agreement with those determined under controlled conditions in a solar simulator. An analytical relation for the normalized efficiency is proposed based on existing formulation for the fill factor. Despite the approximate nature of the fill factor relation, this approach produces reliable results. It will be shown that a normalized efficiency curve can be used to extract information on the series and shunt resistances of the PV module and that the shunt resistance as a function of solar irradiance can be studied. Alternately,more » this formulation can be used to study the low irradiance losses of a module when the internal resistances are known.« less

Authors:
 [1];  [2];  [3]
  1. Technological Educational Institute of Crete, Crete (Greece)
  2. Univ. of Oregon, Eugene, OR (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1394902
Report Number(s):
NREL/JA-5J00-70188
Journal ID: ISSN 0038-092X
Grant/Contract Number:
AC36-08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Solar Energy
Additional Journal Information:
Journal Volume: 157; Journal Issue: C; Journal ID: ISSN 0038-092X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; photovoltaic modules; efficiency; fill factor; series resistance; shunt resistance; low irradiance losses

Citation Formats

Mavromatakis, F., Vignola, F., and Marion, Bill. Low irradiance losses of photovoltaic modules. United States: N. p., 2017. Web. doi:10.1016/j.solener.2017.08.062.
Mavromatakis, F., Vignola, F., & Marion, Bill. Low irradiance losses of photovoltaic modules. United States. doi:10.1016/j.solener.2017.08.062.
Mavromatakis, F., Vignola, F., and Marion, Bill. Fri . "Low irradiance losses of photovoltaic modules". United States. doi:10.1016/j.solener.2017.08.062.
@article{osti_1394902,
title = {Low irradiance losses of photovoltaic modules},
author = {Mavromatakis, F. and Vignola, F. and Marion, Bill},
abstractNote = {Here, the efficiency of a photovoltaic cell/module changes, as the intensity of incident irradiance decreases, in a non linear way and these changes are referred to as low irradiance losses. In this study data from field experiments, developed and organized by the National Renewable Energy Laboratory, are used to evaluate the low irradiance losses for a variety of module technologies. The results demonstrate that the ratio of the normalized power divided by the normalized short circuit current provide a good measure of the module's low light efficiency losses after both the maximum power and the short circuit current are adjusted for temperature effects. The normalized efficiencies determined through the field data, spanning for several months, are in good agreement with those determined under controlled conditions in a solar simulator. An analytical relation for the normalized efficiency is proposed based on existing formulation for the fill factor. Despite the approximate nature of the fill factor relation, this approach produces reliable results. It will be shown that a normalized efficiency curve can be used to extract information on the series and shunt resistances of the PV module and that the shunt resistance as a function of solar irradiance can be studied. Alternately, this formulation can be used to study the low irradiance losses of a module when the internal resistances are known.},
doi = {10.1016/j.solener.2017.08.062},
journal = {Solar Energy},
number = C,
volume = 157,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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