Field experiment of 800× off-axis XR-Köhler concentrator module on a carousel tracker


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.

Publication type: 
Published in: 
9th International Conference on Concentrator Photovoltaic Systems Miyazaki, Japan. Proceedings 1556
Publication date: 
April 2013
CeDInt Authors: 
Other Authors: 
Noboru Yamada, Kazuya Okamoto, Toshikazu Ijiro, Takao Suzuki, Toshihiko Maemura, Takashi Kawaguchi, Hiroshi Takahashi, Takashi Sato, Julio Chaves, Juan Vilaplana, Ruben Mohedano