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Title: Evaluation and Field Assessment of Bifacial Photovoltaic Module Power Rating Methodologies: Preprint

Abstract

1-sun power ratings for bifacial modules are currently undefined. This is partly because there is no standard definition of rear irradiance given 1000 Wm-2 on the front. Using field measurements and simulations, we evaluate multiple deployment scenarios for bifacial modules and provide details on the amount of irradiance that could be expected. A simplified case that represents a single module deployed under conditions consistent with existing 1-sun irradiance standards leads to a bifacial reference condition of 1000 Wm-2 Gfront and 130-140 Wm-2 Grear. For fielded systems of bifacial modules, Grear magnitude and spatial uniformity will be affected by self-shade from adjacent modules, varied ground cover, and ground-clearance height. A standard measurement procedure for bifacial modules is also currently undefined. A proposed international standard is under development, which provides the motivation for this work. Here, we compare outdoor field measurements of bifacial modules with irradiance on both sides with proposed indoor test methods where irradiance is only applied to one side at a time. The indoor method has multiple advantages, including controlled and repeatable irradiance and thermal environment, along with allowing the use of conventional single-sided flash test equipment. The comparison results are promising, showing that the indoor and outdoor methodsmore » agree within 1%-2% for multiple rear-irradiance conditions and bifacial module types.« less

Authors:
; ; ; ; ;
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:
1258571
Report Number(s):
NREL/CP-5J00-66496
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 43rd IEEE Photovoltaic Specialists Conference, 5-10 June 2016, Portland, Oregon
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 29 ENERGY PLANNING, POLICY, AND ECONOMY; bifacial solar photovoltaics; standards; albedo

Citation Formats

Deline, Chris, MacAlpine, Sara, Marion, Bill, Toor, Fatima, Asgharzadeh, Amir, and Stein, Joshua S. Evaluation and Field Assessment of Bifacial Photovoltaic Module Power Rating Methodologies: Preprint. United States: N. p., 2016. Web. doi:10.1109/PVSC.2016.7750367.
Deline, Chris, MacAlpine, Sara, Marion, Bill, Toor, Fatima, Asgharzadeh, Amir, & Stein, Joshua S. Evaluation and Field Assessment of Bifacial Photovoltaic Module Power Rating Methodologies: Preprint. United States. doi:10.1109/PVSC.2016.7750367.
Deline, Chris, MacAlpine, Sara, Marion, Bill, Toor, Fatima, Asgharzadeh, Amir, and Stein, Joshua S. Thu . "Evaluation and Field Assessment of Bifacial Photovoltaic Module Power Rating Methodologies: Preprint". United States. doi:10.1109/PVSC.2016.7750367. https://www.osti.gov/servlets/purl/1258571.
@article{osti_1258571,
title = {Evaluation and Field Assessment of Bifacial Photovoltaic Module Power Rating Methodologies: Preprint},
author = {Deline, Chris and MacAlpine, Sara and Marion, Bill and Toor, Fatima and Asgharzadeh, Amir and Stein, Joshua S.},
abstractNote = {1-sun power ratings for bifacial modules are currently undefined. This is partly because there is no standard definition of rear irradiance given 1000 Wm-2 on the front. Using field measurements and simulations, we evaluate multiple deployment scenarios for bifacial modules and provide details on the amount of irradiance that could be expected. A simplified case that represents a single module deployed under conditions consistent with existing 1-sun irradiance standards leads to a bifacial reference condition of 1000 Wm-2 Gfront and 130-140 Wm-2 Grear. For fielded systems of bifacial modules, Grear magnitude and spatial uniformity will be affected by self-shade from adjacent modules, varied ground cover, and ground-clearance height. A standard measurement procedure for bifacial modules is also currently undefined. A proposed international standard is under development, which provides the motivation for this work. Here, we compare outdoor field measurements of bifacial modules with irradiance on both sides with proposed indoor test methods where irradiance is only applied to one side at a time. The indoor method has multiple advantages, including controlled and repeatable irradiance and thermal environment, along with allowing the use of conventional single-sided flash test equipment. The comparison results are promising, showing that the indoor and outdoor methods agree within 1%-2% for multiple rear-irradiance conditions and bifacial module types.},
doi = {10.1109/PVSC.2016.7750367},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 16 00:00:00 EDT 2016},
month = {Thu Jun 16 00:00:00 EDT 2016}
}

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