Performance Analysis of Bifacial PV Modules with Transparent Mesh Backsheet

Juhee Jang, Andrea Pfreundt, Max Mittag and Kyungsoo Lee
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Juhee Jang: Energy & Electrical Engineering, Korea Polytechnic University, Siheung-si 15073, Korea
Andrea Pfreundt: Fraunhofer Institute for Solar Energy Systems ISE, 79110 Freiburg, Germany
Max Mittag: Fraunhofer Institute for Solar Energy Systems ISE, 79110 Freiburg, Germany
Kyungsoo Lee: Energy & Electrical Engineering, Korea Polytechnic University, Siheung-si 15073, Korea

Energies, 2021, vol. 14, issue 5, 1-15

Abstract: Due to their transparent rear side, bifacial modules can take advantage of rear side irradiance as opposed to monofacial modules. Glass or transparent backsheets are conventionally used as rear side encapsulation material. To increase coupling gains achieved through internal reflection at the module rear side, a white or reflecting mesh structure can be applied in the areas between the cells on the rear side material. In this study, an existing optical model based on a simplified ray tracing approach is extended to describe the effects achieved though this mesh structure. The model is further integrated into a complete cell-to-module loss and gain analysis. The performance of the mesh backsheet concept is assessed under varying parameters. The impact of mesh reflectance, bifaciality of the cell and width of the mesh compared to the cell spacing are investigated. Losses due to increased module temperature and gains due to internal reflection gains are compared. We confirm that the optimal power gain can be achieved when the width of the mesh is the same as the spacing between the cells. We find that the power gain due to the improved internal reflection outweighs the power loss due to increased module temperature.

Keywords: solar cells; transparent mesh backsheet; reflectance; bifaciality factor; module temperature; white backsheet width; cell-to-module (CTM) ratio; power gain (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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