Yamada, Noboru and Okamoto, Kazuya and Ijiro, Toshikazu and Suzuki, Takao and Maemura, Toshihiko and Kawaguchi, Takashi and Takahashi, Hiroshi and Sato, Takashi and Hernández Sanz, Maikel and Benitez Gimenez, Pablo and Chaves, Julio and Cvetkovic, Aleksandra and Vilaplana, J. and Mohedano, Rubén and Mendes Lopes, Joao and Miñano Dominguez, Juan Carlos
Field experiment of 800× off-axis XR-Köhler concentrator module on a carousel tracker.
In: "9th International Conference on Concentrator Photovoltaic Systems", 15/04/2013 - 17/04/2013, Miyazaki, Japan. pp. 194-196.
This paper presents the design and preliminary experimental results of a concentrator-type photovoltaic module based on a free-form off-axis 800×XR-Köhler concentrator. The off-axis XR-Köhler concentrator is one of the advanced concentrators that perform high concentration with a large acceptance angle and excellent irradiance uniformity on a solar cell. As a result of on-sun characterization of the unglazed single-cell unit test rig, the temperature-corrected DC module efficiency was 32.2% at 25 °C without an anti-reflective (AR) coating on the secondary optics, and the acceptance angle was more than ±1.0°. In addition, the non-corrected DC efficiency of an individual cell in a glazed 8-cell unit module mounted on a carousel tracking system was measured. The individual efficiency deviated in the range of 24.3-27.4%, owing to the mirror shape and alignment errors. The resultant series-connected efficiency was approximately 25% at direct normal irradiation (DNI) of 770 W/m2.