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Title: Bifacial PV System Mismatch Loss Estimation & Parameterization

Abstract

Non-uniform irradiance on the rear-side of bifacial PV systems can cause additional mismatch loss which may not be appropriately captured in PV energy production estimates and software. We have evaluated several rooftop mounted systems over high albedo reflective roofs. Mismatch losses of up to 2% annual loss for very close-mounted (0.15 m) rooftop systems were found, but losses for high ground-clearance rooftop systems were lower (<0.5%). A simplified empirical relationship was found that links the spatial variation of irradiance (specifically the mean absolute difference of irradiance) to the resulting mismatch loss factor, with a R2 fit better than 0.985. This approximate relationship has been validated by experiments on mismatched PV modules, and provides a basis for fast estimation of bifacial mismatch loss factors for use in hourly PV performance simulations such as PVSyst or SAM.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Juwi Solar Americas, Boulder, CO USA
  3. Rovira i Virgili University, Tarragona, Spain
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:
1569210
Report Number(s):
NREL/PR-5K00-74885
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 36th European PV Solar Energy Conference and Exhibition (EU PVSEC), 9-13 September 2019, Marseille, France
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; solar; photovoltaic; PV; bifacial PV system; irradiance distribution; power output

Citation Formats

Deline, Christopher A, Ayala Pelaez, Silvana, MacAlpine, Sara, and Olalla, Carlos. Bifacial PV System Mismatch Loss Estimation & Parameterization. United States: N. p., 2019. Web.
Deline, Christopher A, Ayala Pelaez, Silvana, MacAlpine, Sara, & Olalla, Carlos. Bifacial PV System Mismatch Loss Estimation & Parameterization. United States.
Deline, Christopher A, Ayala Pelaez, Silvana, MacAlpine, Sara, and Olalla, Carlos. Thu . "Bifacial PV System Mismatch Loss Estimation & Parameterization". United States. https://www.osti.gov/servlets/purl/1569210.
@article{osti_1569210,
title = {Bifacial PV System Mismatch Loss Estimation & Parameterization},
author = {Deline, Christopher A and Ayala Pelaez, Silvana and MacAlpine, Sara and Olalla, Carlos},
abstractNote = {Non-uniform irradiance on the rear-side of bifacial PV systems can cause additional mismatch loss which may not be appropriately captured in PV energy production estimates and software. We have evaluated several rooftop mounted systems over high albedo reflective roofs. Mismatch losses of up to 2% annual loss for very close-mounted (0.15 m) rooftop systems were found, but losses for high ground-clearance rooftop systems were lower (<0.5%). A simplified empirical relationship was found that links the spatial variation of irradiance (specifically the mean absolute difference of irradiance) to the resulting mismatch loss factor, with a R2 fit better than 0.985. This approximate relationship has been validated by experiments on mismatched PV modules, and provides a basis for fast estimation of bifacial mismatch loss factors for use in hourly PV performance simulations such as PVSyst or SAM.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {9}
}

Conference:
Other availability
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