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Energy yield measurement of an elevated PV system on a white flat roof and a performance comparison of monofacial and bifacial modules

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  • Muehleisen, W.
  • Loeschnig, J.
  • Feichtner, M.
  • Burgers, A.R.
  • Bende, E.E.
  • Zamini, S.
  • Yerasimou, Y.
  • Kosel, J.
  • Hirschl, C.
  • Georghiou, G.E.

Abstract

Bifacial solar panels installed on flat rooftop of industrial buildings are an effective way to boost the yield. The albedo of the flat roof determines to great extent the bifacial gain. However, because it changes due to soiling and moss growth, the power output of bifacial PV installations over time is difficult to calculate. For the purpose of evaluating and rating the effect of bifacial PV rooftop systems, a small plant with 20 modules including dummies was installed. To guarantee an optimized output, a commercial bifacial PV module supporting construction was placed on a flat roof that was painted white. By using an east-west orientation, an optimum for the use of available roof space was reached. The yield for each module was determined with power optimizers and the extracted data, provided by the monitoring portal, were analysed. The data were collected for each day over a time of one year. Three different modules, both east and west orientated, were investigated. The bifacial module with a transparent backsheet compared to a module with the same bifacial cells but with a black backsheet, showed initially a benefit of 17% for the east and 15% for the west orientated panels. After one year of operation, a measured benefit of 7% for the east and 5% for the west orientated panels remained due to albedo loss because of moss growth and pollution. The use of panels with 92% bifaciality resulted in a higher yield of up to 3% compared to panels with 70% bifaciality.

Suggested Citation

  • Muehleisen, W. & Loeschnig, J. & Feichtner, M. & Burgers, A.R. & Bende, E.E. & Zamini, S. & Yerasimou, Y. & Kosel, J. & Hirschl, C. & Georghiou, G.E., 2021. "Energy yield measurement of an elevated PV system on a white flat roof and a performance comparison of monofacial and bifacial modules," Renewable Energy, Elsevier, vol. 170(C), pages 613-619.
    • Handle: RePEc:eee:renene:v:170:y:2021:i:c:p:613-619
    DOI: 10.1016/j.renene.2021.02.015
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    Citations

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    Cited by:

    1. Hayibo, Koami Soulemane & Petsiuk, Aliaksei & Mayville, Pierce & Brown, Laura & Pearce, Joshua M., 2022. "Monofacial vs bifacial solar photovoltaic systems in snowy environments," Renewable Energy, Elsevier, vol. 193(C), pages 657-668.
    2. Elmehdi Mouhib & Leonardo Micheli & Florencia M. Almonacid & Eduardo F. Fernández, 2022. "Overview of the Fundamentals and Applications of Bifacial Photovoltaic Technology: Agrivoltaics and Aquavoltaics," Energies, MDPI, vol. 15(23), pages 1-30, November.
    3. Prasad, Manendra & Prasad, Ramendra, 2023. "Bifacial vs monofacial grid-connected solar photovoltaic for small islands: A case study of Fiji," Renewable Energy, Elsevier, vol. 203(C), pages 686-702.
    4. Emad M. Ahmed & Mokhtar Aly & Manar Mostafa & Hegazy Rezk & Hammad Alnuman & Waleed Alhosaini, 2022. "An Accurate Model for Bifacial Photovoltaic Panels," Sustainability, MDPI, vol. 15(1), pages 1-27, December.
    5. Jiashu Kong & Yitong Dong & Aravind Poshnath & Behzad Rismanchi & Pow-Seng Yap, 2023. "Application of Building Integrated Photovoltaic (BIPV) in Net-Zero Energy Buildings (NZEBs)," Energies, MDPI, vol. 16(17), pages 1-26, September.
    6. Diego A. Flores-Hernández & Alberto Luviano-Juárez & Norma Lozada-Castillo & Octavio Gutiérrez-Frías & César Domínguez & Ignacio Antón, 2021. "Optimal Strategy for the Improvement of the Overall Performance of Dual-Axis Solar Tracking Systems," Energies, MDPI, vol. 14(22), pages 1-24, November.
    7. Amir A. Abdallah & Maulid Kivambe & Brahim Aïssa & Benjamin W. Figgis, 2023. "Performance of Monofacial and Bifacial Silicon Heterojunction Modules under Desert Conditions and the Impact of PV Soiling," Sustainability, MDPI, vol. 15(10), pages 1-13, May.
    8. Deepak Jain Veerendra Kumar & Lelia Deville & Kenneth A. Ritter & Johnathan Richard Raush & Farzad Ferdowsi & Raju Gottumukkala & Terrence Lynn Chambers, 2022. "Performance Evaluation of 1.1 MW Grid-Connected Solar Photovoltaic Power Plant in Louisiana," Energies, MDPI, vol. 15(9), pages 1-21, May.

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