Field Performance Assessment and Comparison of Mono & Bifacial PV Modules

Marzoli, Matteo and Medici, Vasco and Corbellini, Gianluca and Caccivio, Mauro and Friesen, Gabi (2015) Field Performance Assessment and Comparison of Mono & Bifacial PV Modules. In: European PV solar energy conference and exhibition 2015, 14-18.09.2015, Hamburg. (In Press)

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In order to evaluate the performances of bifacial PV modules, 3 HJT high efficiency bifacial modules and 9 monofacial, from different producer, have been installed in a standard test facility for modules evaluation. The modules were fully indoor characterized (measurement of Pm, temperature and irradiance coefficients). The on-field electrical parameters of the modules and the irradiance of the front and back sides of the modules were measured with high accuracy equipment for 6 months from June to December 2014. The contribution of the back face radiation was 8.5% of the front face radiation. The gain in performance ratio for bifacial modules was from 4.7% to 13.7% (considering all the technologies) and average 10% considering monofacial modules of the same technology. With respect to the effect of the position of the sun, as expected the bifacial always outperformed the monofacial: the gain is proportional to the sun elevation (reflection of the beam component) and take advantage of the reflection of the diffuse component when the beam component is lower (early and later hours of the day). We also show that for the same inverter size, bifacial modules produce slightly more energy, as they take more advantage of the diffuse component of radiation and of the direct reflections when the sun is low on the horizon.

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