4.7 Article

Inhomogeneous rear reflector induced hot-spot risk and power loss in building-integrated bifacial c-Si photovoltaic modules

Journal

RENEWABLE ENERGY
Volume 163, Issue -, Pages 825-835

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.09.020

Keywords

Bifacial photovoltaic; Building-integrated photovoltaic; Rear surface reflection; Hotspot

Funding

  1. Basic Science Research Program through the National Research Foundation of Korea grant - Ministry of Education [NRF-2019R1F1A1057693, 2019R1F1A1057693]
  2. New & Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Ministry of Trade, Industry and Energy, Korea [20193010014570]
  3. Korea Evaluation Institute of Industrial Technology (KEIT) [20193010014570] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  4. National Research Foundation of Korea [2019R1F1A1057693] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The study revealed that an inhomogeneous rear surface design in building-integrated bifacial photovoltaic modules can lead to power loss and reliability issues. Therefore, careful consideration or design of the rear surface of BF-PV modules is necessary to maximize their performance and reliability.
A building-integrated bifacial photovoltaic (BF-PV) module is a strong candidate for realizing zero-energy buildings because it can achieve high power output by collecting light from both the front and rear sides of the building. However, harvesting non-uniformly distributed rear incident light is a very challenge issue in BF-PV. In this study, we empirically investigated the effect of an inhomogeneous rear surface on the power and reliability of a BF-PV. The mini-module test showed that a non-uniform rear reflection triggers a current mismatch among cells, resulting in the overheating of cells above the low reflectance surface. In particular, a large difference in the reflectance inside the rear reflector installed close to the module increases a hot-spot risk. This risk can be reduced by minimizing the variation of the reflectance, as well as elongating the distance between the cell and the reflector. A theoretical calculation based on empirical results indicated that an inhomogeneous rear reflector results in power loss or a reliability issue in BF-PV modules. Hence, the rear surface of a BF-PV module should be carefully designed or considered in order to maximize its performance and reliability. (C) 2020 Elsevier Ltd. All rights reserved.

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