Dr. Markus Klenk

Projects

• Improving the reliability and performance of photovoltaic-(PV)-systems – IEA PVPS Task 13 Swiss Consortium (2026-2029) / Deputy project leader / ongoing
• Performance of Photovoltaic Systems under Partial Shading Conditions: From Cell to System / Deputy project leader / ongoing
• Profitability of PV systems on green roofs / Team member / ongoing
• PVEco – Profitability study of photovoltaic systems taking dynamic electricity tariffs into account / Team member / ongoing
• Alpine PV Competence / Deputy project leader / completed
• Performance, Operation & Reliability of Photovoltaic-Systems / Team member / completed
• Ultra lightweight PV modules / Team member / completed

Publications

Articles in scientific journal, peer-reviewed

• Nussbaumer, H. et al. (2020) 'Accuracy of simulated data for bifacial systems with varying tilt angles and share of diffuse radiation', Solar Energy, 197, pp. 6–21. doi: 10.1016/j.solener.2019.12.071.
• Chudinzow, D., Klenk, M. and Eltrop, L. (2020) 'Impact of field design and location on the techno-economic performance of fixed-tilt and single-axis tracked bifacial photovoltaic power plants', Solar Energy, 207, pp. 564–578. doi: 10.1016/j.solener.2020.06.096.
• Berrian, D. et al. (2019) 'Performance of bifacial PV arrays with fixed tilt and horizontal single-axis tracking : comparison of simulated and measured data', IEEE Journal of Photovoltaics, 9(6), pp. 1583–1589. doi: 10.1109/JPHOTOV.2019.2924394.
• Nussbaumer, H. et al. (2019) 'Energy yield prediction of a bifacial PV system with a miniaturized test array', Solar Energy, 179, pp. 316–325. doi: 10.1016/j.solener.2018.12.042.
• Baumann, T. et al. (2019) 'Photovoltaic systems with vertically mounted bifacial PV modules in combination with green roofs', Solar Energy, 190, pp. 139–146. doi: 10.1016/j.solener.2019.08.014.

Written conference contributions, peer-reviewed

• Nussbaumer, H. et al. (2025) 'Measures to adapt the power output on demand by system design on rooftop PV systems', in 42nd European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Bilbao, Spain, 22-26 September 2025.
• Klenk, M. et al. (2024) 'PV on green roofs : two years of comparative measurement data from various system concepts, supplemented by simulation results and general considerations', in Proceedings of the 41st European Photovoltaic Solar Energy Conference and Exhibition. Munich: WIP, pp. 020371–001–020371–008. doi: 10.4229/EUPVSEC2024/4BV.4.14.
• Nussbaumer, H. et al. (2024) 'Increasing the proportion of winter electricity through design optimisation of photovoltaic roof systems', in Proceedings of the 41st European Photovoltaic Solar Energy Conference and Exhibition. Munich: WIP, pp. 020458–001–020458–004. doi: 10.4229/EUPVSEC2024/4DV.4.5.
• Nussbaumer, H. et al. (2024) 'Highest energy yields per area for PV systems on flat roofs', in Proceedings of the 41st European Photovoltaic Solar Energy Conference and Exhibition. Munich: WIP, pp. 020460–001–020460–005. doi: 10.4229/EUPVSEC2024/4DV.4.10.
• Baumgartner, F. P. et al. (2024) 'MPP tracking losses of module level power electronics at partial module shading', in Proceedings of the 41st European Photovoltaic Solar Energy Conference and Exhibition. Munich: WIP, pp. 020289–001–020289–006. doi: 10.4229/EUPVSEC2024/3EO.1.5.
• Nussbaumer, H. et al. (2023) 'Photovoltaic and green roof : energy yield per area of vertically installed bifacial modules in dense arrangements', in Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition. München: WIP, pp. 020424–001–020424–007. doi: 10.4229/EUPVSEC2023/4DO.12.5.
• Lang, M. et al. (2021) 'FEM simulation of deformations in strings of shingled solar cells under mechanical and thermal loading', in Proceedings of the 38th EUPVSEC. München: WIP. Available at: https://userarea.eupvsec.org/proceedings/EU-PVSEC-2021/4AV.2.27/.
• Nussbaumer, H. et al. (2020) 'Miniaturized model kit for yield measurements of PV systems : concept and application', in Proceedings of the 2020 47th IEEE Photovoltaic Specialists Conference (PVSC). IEEE, pp. 1093–1095. doi: 10.1109/PVSC45281.2020.9300554.

Other publications

• Nussbaumer, H. et al. (2019) 'PV systems with lowest LCOE using bifacial modules : state-of-the-art systems and components', PV-Tech Power, 18, pp. 16–27.
• Janssen, G. J. M. et al. (2018) 'How to maximize the kwh/kwp ratio : simulations of single-axis tracking in bifacial systems', in 35th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC), Brussels, Belgium, 24-27 September 2018.
• Klenk, M. et al. (2018) 'Bifacial PV systems and yield data (bifacial gain)', in Kopecek, R. and Libal, J. (eds) Bifacial photovoltaics : technology, applications and economics. Institution of Engineering and Technology, pp. 153–214.
• Baumann, T. et al. (2018) 'Performance analysis of vertically mounted bifacial PV modules on green roof system', in 35th European Photovoltaic Solar Energy Conference and Exhibition. WIP. doi: 10.21256/zhaw-4034.
• Nussbaumer, H. et al. (2018) 'State-of-the-art bifacial module technology', Photovoltaics International, 2018(41), pp. 108–125.
• Nussbaumer, H. et al. (2017) 'Record-light weight c-Si modules based on the small unit compound approach : mechanical load tests and general results', in Proceedings of the 33rd European Photovoltaic Solar Energy Conference and Exhibition. WIP, pp. 146–150. doi: 10.4229/EUPVSEC20172017-1CV.3.69.
• Baumann, T. et al. (2017) 'Illumination homogeneity of bifacial systems : outdoor measurements with systematically varied installation conditions : visual', in Proceedings of the EU PVSEC 2017, pp. 1605–1609. doi: 10.4229/EUPVSEC20172017-5BV.4.28.
• Nussbaumer, H. et al. (2017) 'Application of shaped reflectors to increase the energy harvest of bifacial PV systems : analyzed with a miniaturized test array', in 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC 2017) : Proceedings. IEEE, pp. 1077–1080.
• Nussbaumer, H. et al. (2016) 'Influence of low concentration on the energy harvest of PV systems using bifacial modules', in Proceedings of the EU PVSEC 2016 (Munich). WIP.
• Nussbaumer, H. et al. (2016) 'Miniaturized test array as a means to determine the energy harvest of bifacial installations', in Poceedings of the 2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC). IEEE, pp. 2698–2703. doi: 10.1109/PVSC.2016.7750140.
• Nussbaumer, H. et al. (2016) 'Miniaturized test array as a means to determine the energy harvest of bifacial installations', in IEEE PVSC 2016 : Kongress. IEEE, pp. 2698–2703. doi: 10.1109/PVSC.2016.7750140.
• Nussbaumer, H., Klenk, M. and Keller, N. (2016) 'Small unit compound modules : a new approach for light weight PV modules', in Proceedings of the 32nd European Photovoltaic Solar Energy Conference and Exhibition. WIP, pp. 56–60. doi: 10.4229/EUPVSEC20162016-1BO.12.5.
• Nussbaumer, H. et al. (2015) 'PV installations based on vertically mounted bifacial modules evaluation of energy yield and shading effects', in Proceedings of the 31st European Photovoltaic Solar Energy Conference and Exhibition. WIP, pp. 2037–2041. doi: 10.4229/EUPVSEC20152015-5AV.6.34.

Oral conference contributions and abstracts

• Klenk, M. (2023) 'Energiegründach mit vertikal installierter PV in der Praxis', in 21. Schweizer Photovoltaik-Tagung, Bern, Schweiz, 20.-21. März 2023. Available at: https://www.swissolar.ch/fileadmin/user_upload/Tagungen/PV-Tagung_2023/Praesentationen_Tag2/PVT23_4.3_Markus_Klenk.pdf.
• Nussbaumer, H. et al. (2021) 'Comparative energy yield study of vertically installed bifacial PV modules measured by a miniturized test rig', in 38th European Photovoltaic Solar Energy Conference and Exhibition (EUPVSEC), online, 6-10 September 2021.
• Klenk, M. et al. (2018) 'Bifacial modeling with the BIFOROT', in Fifth bifiPV Workshop, Denver, USA, 10-11 September 2018.
• Klenk, M. et al. (2017) 'BIFOROT – Experimental data for LCOE appraisal of bifacial systems', in 4th bifiPV Workshop 2017, Konstanz, Deutschland, 25-26 October 2017.
• Klenk, M. et al. (2016) 'Bifacial outdoor roto tester : BIFOROT', in 3rd bifi PV 2016 Workshop on Bifacial PV, Miyazaki, Japan, 29-30 September 2016. Miyazaki: University of Miyazaki.

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