Determining the effect of soil albedo on energy production of bifacial photovoltaic panels

Yıl 2025, Cilt: 10 Sayı: 4, 1683 - 1696, 29.12.2025

İnci Nur Atalay , Sıtkı Kocaoğlu

https://doi.org/10.58559/ijes.1835203

Öz

The performance of bifacial photovoltaic (PV) systems is strongly affected by site-specific environmental conditions, making field-based analyses essential for reliable performance evaluation. This study investigates the effect of ground albedo on the energy performance of a 686 kWp utility-scale bifacial PV power plant located in Konya, Türkiye, with primary emphasis on real operational data obtained under actual climatic conditions. The analysis is based on eight months of measured production data (March–October 2024) collected from two identical bifacial PV arrays installed over different ground surfaces: natural soil (albedo ≈ 0.20) and white gravel (albedo ≈ 0.50). Field measurements indicate that the system installed over white gravel produced 496.49 MWh, compared to 476.87 MWh generated by the soil-based system. This corresponds to an additional energy yield of 19.63 MWh and a relative increase of 4.26%. Monthly evaluations show that albedo-induced gains are more pronounced during periods of moderate solar altitude, while remaining positive throughout the entire measurement period. Numerical modelling and shading analyses were employed as supporting tools to interpret observed trends and assess long-term behavior. Shading simulations identified a fixed tilt angle of 25° as the most suitable configuration, providing an optimal balance between rear-side irradiance collection and shading losses. PVsyst simulations predicted an annual energy gain of 3.89% and a 3.25 percentage-point improvement in the performance ratio when ground albedo was increased from 0.20 to 0.50, consistent with the tendencies observed in the field data. Overall, the results confirm that ground albedo enhancement offers a consistent and measurable performance benefit for bifacial PV systems. High-reflectance surfaces such as white gravel represent a low-cost, passive, and practical strategy for improving energy yield and system efficiency. These findings provide valuable guidance for the design and optimization of fixed-tilt, utility-scale bifacial PV installations, particularly in high-irradiance, semi-arid regions.

Anahtar Kelimeler

Albedo , bifacial photovoltaic panels , shading analysis , solar energy

Kaynakça

• [1] Smil V. Energy and civilization: a history. MIT Press, 2018.
• [2] Sovacool BK. How long will it take? Conceptualizing the temporal dynamics of energy transitions. Energy Research & Social Science 2016; 13: 202-215.
• [3] International Energy Agency (IEA). Zero by 2050: a roadmap for the global energy sector. International Energy Agency, 2021.
• [4] VDMA Photovoltaics Equipment. International Technology Roadmap for Photovoltaics (ITRPV), Sixteenth Edition. VDMA Photovoltaics Equipment, Frankfurt, Germany, 2025.
• [5] Branker K, Pathak MJM, Pearce JM. A review of solar photovoltaic levelized cost of electricity. Renewable and Sustainable Energy Reviews 2011; 15(9): 4470-4482.
• [6] Jäger-Waldau A. PV status report 2019. Publications Office of the European Union, Luxembourg, 2019; 7-94.
• [7] Enerji ve Tabii Kaynaklar Bakanlığı (ETKB). Türkiye enerji dengesi. Ankara, Türkiye, 2023.
• [8] Arslanoğlu M. Konya ilinin güneş enerjisi potansiyeli ve yenilenebilir enerji yatırımları. Mühendislik Bilimleri ve Tasarım Dergisi 2021; 9(3): 1080-1092.
• [9] Erdemir F. Experimental investigation of the sensitivity of parameters affecting efficiency in photovoltaic (PV) systems in the Konya and Karaman region. MSc Thesis, Karamanoğlu Mehmetbey University, 2021.
• [10] Brennan MP, Abramase AL, Andrews RW, Pearce JM. Effects of spectral albedo on solar photovoltaic devices. Solar Energy Materials and Solar Cells 2014; 124: 111-116.
• [11] Alam M, Gul MS, Muneer T. Performance analysis and comparison between bifacial and monofacial solar photovoltaic at various ground albedo conditions. Renewable Energy Focus 2023; 44: 295-316.
• [12] Oke TR. Boundary layer climates. Routledge, 2002.
• [13] Liang S. Narrowband to broadband conversions of land surface albedo I: Algorithms. Remote Sensing of Environment 2001; 76(2): 213-238.
• [14] Appelbaum J. Bifacial photovoltaic panels field. Renewable Energy 2016; 85: 338-343.
• [15] Huawei Technologies Co., Ltd. SUN2000-330KTL-H1 smart string inverter datasheet. Huawei Technologies Co., Ltd., 2023.
• [16] Schmid Pekintaş. SPE540–545–550 solar module datasheet. Schmid Pekintaş, 2023.
• [17] Marion B. Measured and satellite-derived albedo data for estimating bifacial photovoltaic system performance. Solar Energy 2021; 215: 321-327.