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Hot-Spot Endurance Test - Modifications for Bifacial Photovoltaic Modules
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mülhöfer, G. Fokuhl, Esther Manuel, Hertter Philipp, Daniel |
| Copyright Year | 2018 |
| Abstract | This paper aims at identifying suitable procedures for hot-spot endurance tests on bifacial PV modules. Drawing on the relevant background, i.e., normative requirements and available studies, it considers existing theoretical models and procedures for their application on bifacial modules. The resulting assumptions are subjected to experimental tests on four modules and in three approaches varying in their irradiance of module sides as well as location and degree of cell shading. In a second cycle, the first two approaches were repeated with extreme variations in irradiance level foreseen by the standard IEC 61215-2:2016. As it turns out, worst-case hot-spot temperatures appear in all three approaches, indicating a necessity for comprehensive testing. However, worst-case hot-spot temperatures are highly sensitive to irradiance intensity in general to an extent that may affect their passing or failing a hot-spot test, even if the test is done within the specified range of 900 to1100 W/m2. It is therefore advised to reconsider the currently permitted leeway in equipment precision for both bifacial and conventional monofacial modules. 1 MOTIVATION AND BACKGROUND Bifacial solar modules can operate at higher currents compared to conventional modules as they use irradiance from both their front and rear sides. However, the electrical point of operation of single modules or cells can vary in a wider range, as more factors influence the overall irradiance. Thus, bifaciality presents particular challenges of its own not only for the system layout but also with regard to reliability. This paper addresses the behavior of bifacial PV modules under inhomogeneous illumination, especially under partial shading. The results and findings are based on a series of shading experiments on several commercially available bifacial modules. The major aims of this study are to contribute to the adaptation of important testing standards (IEC 61215-2:2016 and IEC 617302:2016) for bifacial modules enhance the general understanding of the behavior of bifacial modules under inhomogeneous front or rear side illumination. |
| Starting Page | 1029 |
| Ending Page | 1033 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| DOI | 10.4229/35thEUPVSEC20182018-5BO.10.3 |
| Alternate Webpage(s) | https://www.ise.fraunhofer.de/content/dam/ise/de/documents/publications/conference-paper/35-eupvsec-2018/Philipp_5BO103.pdf |
| Alternate Webpage(s) | https://doi.org/10.4229/35thEUPVSEC20182018-5BO.10.3 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
