Photovoltaic Energy Production in Greenhouses With Spectral Splitting Solar Trackers

Analysis of the Novel Voltiris System




Photovoltaic Panel, Photovoltaic Tracker, Spectral Separation, Semi-Transparent Photovoltaics, Agrivoltaics, Agrivoltaic System, Solar Energy, Greenhouse, Low Light Environment, Agricultural Photovoltaic Development


The spectral filtering low concentration photovoltaic system developed by Voltiris is an innovative solution for energy production in greenhouses without affecting food production. A first prototype was installed in the greenhouse of the agricultural research center Agroscope in Conthey, Switzerland. During an eight-month agronomic study from March to October, the yield of tomato, pepper bell and basil under this system was on a par with a control group. I-V curves were recorded to evaluate the photovoltaic system performance, and the impact of concentration and filtering. The curves showed that the prototype achieved a direct normal irradiation efficiency of 10.1 %. The specific power output of the Voltiris system inside the greenhouse was comparable to the one of a conventional solar panel placed outside. Filters with two different transmission spectra were used, both of which were matched to the absorption spectra of chlorophyll and reflected 50 % and 60 % of the incident global radiation respectively. To transfer the performance of the system to other greenhouses, the transmittance of the test greenhouse and its glass cover were measured for global and diffuse radiation. This allowed to determine the transmittance of the greenhouse specific metal structure. In the test greenhouse, the overall transmission coefficient for direct solar radiation was 0.28, hence limiting the system yield.


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Barron-Gafford, G.A., Pavao-Zuckerman, M.A., Minor, R.L. et al., "Agrivoltaics provide mutual benefits across the food–energy–water nexus in drylands." Nat Sustain 2, 848–855 (2019).

REN21. Renewables 2023 Demand Modules report,

C. Bibbiani, F. Fantozzi, et C. Gargari, "Wood Biomass as Sustainable Energy for Greenhouses Heating in Italy". ScienceDirect, 2015.

J. Eisenlohr, N. Tucher, B. G. Lee, O. Höhn, H. Hauser, J. Benick, B. Bläsi, M. Hermle, and J. C. Goldschmidt, "Diffractive Gratings for Light Trapping in Crystalline Silicon Solar Cells," in Light, Energy and the Environment 2015, OSA Technical Digest (online) (Optica Publishing Group, 2015), paper PTu4B.4

Peters, M.; Goldschmidt, J.C.; Löper, P.; Groß, B.; Üpping, J.; Dimroth, F.; Wehrspohn, R.B.; Bläsi, B., "Spectrally-Selective Photonic Structures for PV Applications. " Energies 2010, 3, 171-193.

J. C. Goldschmidt, S. Fischer, Benjamin Fröhlich, J. Gutmann, B. Herter, C. Hofmann, J. Löffler, Frank C. J. M. van Veggel, and S. Wolf, "Photon management with luminescent materials and photonic structures", Proc. SPIE 9140, Photonics for Solar Energy Systems V, 91400G (15 May 2014);

Vernon, L. P. and G. R. Seely (1966) "The chlorophylls», Academic Press, NY.

Strain, H. H., M. R. Thomas and J. J. Katz (1963), "Spectral absorption properties of ordinary and fully deuteriated chlorophylls a and b". Biochim. Biophys. Acta 75, 306-311.

S. Pashiardis, S. Kalogirou, et A. Pelengaris, "Characteristics of Photosynthetic Active Radiation (PAR) Through Statistical Analysis at Larnaca, Cyprus", SMgroup, juin 2017.

E. Heuvelink, L. G. G. Batta, et T. H. J. Damen, "Transmission of solar radiation by a multispan Venlo-type glasshouse: validation of a model", Agricultural and forest meteorology. doi:




How to Cite

Broccard, P.-V., Roch, J., Tran, D., Camps, C., & Löffler, J. (2024). Photovoltaic Energy Production in Greenhouses With Spectral Splitting Solar Trackers: Analysis of the Novel Voltiris System. AgriVoltaics Conference Proceedings, 2.

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PV System Technologies

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