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Testing bifacial PV cells in symmetric and asymmetric concentrating CPC collectors
Solarus Sunpower AB.
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2013 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 5, 185-190 p.Article in journal (Refereed) Published
Abstract [en]

Bifacial PV cells have the capacity to produce solar electricity from both sides and, thus, amongst other advantages, allow a significantly increase both in peak and annual power output while utilizing the same amount of silicone. Ac-cording to the manufacturer, the bifacial cells are around 1.3 times more expensive than the single-sided cells. This way, bifacial PV cells can effectively reduce the cost of solar power for certain applications.Today, the most common application for these cells is in stationary vertical collectors which are exposed to sunlight from both sides, as the relative position of the sun changes throughout the day. Another possible application is to utilize these cells in concentrating collectors. Three test prototypes utilizing bifacial PV cells were built. The initial two proto-types were built for indoor testing and differed only in geometry of the reflector, one being asymmetric and the other symmetric. Both prototypes were evaluated in an indoor solar simulator. Both reflector designs yielded positive electri-cal performance results and similar efficiencies from both sides of the cell were achieved. However, lower fill factor than expected was achieved for both designs when compared to the single cell tests. The results are discussed and sug-gestions for further testing are presented. A third prototype was built in order to perform outdoor evaluations. This pro-totype utilized a bifacial PV cells string laminated in silicone enclosed between 2 standard glass panes and a collector box with an asymmetric CPC concentrator. The prototype peak electrical efficiency and temperature dependence were evaluated. A comparison between the performance of the bottom and top sides of the asymmetric collector is also pre-sented. Additionally, the incidence modifier angle (IAM) is also briefly discussed.

Place, publisher, year, edition, pages
2013. Vol. 5, 185-190 p.
Keyword [en]
Bifacial PV cells, Symmetric and asymmetric concentrating concentrators; reflector geometry, prototype, NOCT
National Category
Energy Systems
URN: urn:nbn:se:hig:diva-18537DOI: 10.4236/eng.2013.51b034OAI: diva2:771420
2014 PEEC
Available from: 2014-12-13 Created: 2014-12-13 Last updated: 2014-12-16Bibliographically approved

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Gomes, JoãoKarlsson, Björn
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