Assessing power degradation and reliability of crystalline silicon solar modules with snail trails
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Abstract
Abstract Reliability and lifetime of crystalline silicon solar modules are very important for photovoltaic system performance. That the snail trails occasionally occurred on photovoltaic modules has not yet been solved. In this paper, the influence of the snail trails on the power degradation was investigated in detail by six years’ tracking test and the extended reliability tests. The results show that the average power degradation of the modules with snail trails is 5.90%, while the average power degradation of modules without snail trails is 5.64% over a 6-year operation period. This reveals that the snail trail has a little impact on the performance of solar modules because the snail trail only affects the transmission of the sunlight. Electroluminescence images prove that there is no relationship between snail trails and micro-cracks. To assess the impact of snail trails on the long-term reliability of solar modules, we applied extended reliability tests based on the international standard IEC 61215. The extended reliability tests of solar modules with snail trails reveal that the average power degradation is 1.77% and 0.68% after the damp heat test over 1250 h and the thermal cycling test of 500 cycles, respectively. These results suggest that the long-term reliability and durability of solar modules are not affected by snail trails. The SEM and EDS prove that Ag finger below snail trails has no change, and no corrosion could be identified. The result of XPS indicates that there exists the silver oxide in the EVA affected by snail trails. The results obtained in this paper prove that the warranty period up to 25 years for solar modules with snail trails may be realized under real conditions.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Photovoltaic System Optimization Techniques · Silicon and Solar Cell Technologies · Integrated Circuits and Semiconductor Failure Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (29)
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1. R. Laronde, A. Charki, D. Bigaud, Reliability of photovoltaic modules based on climatic measurement data, in: Proceedings of the International Metrology Conference, 2010, pp. 75–81.10.1051/ijmqe/2010012 ↗
2. Study on long term reliability of photo-voltaic modules and analysis of power degradation using accelerated aging tests and electroluminescence technique10.1016/j.egypro.2011.06.156 ↗
3. Photovoltaic failure and degradation modes10.1002/pip.2866 ↗
4. Performance variation of dark current density-voltage characteristics for PID-affected monocrystalline silicon solar modules from the field10.1016/j.microrel.2017.11.003 ↗
5. J. Berghold, M. Roericht, A. Böttcher, S. Wendlandt, M. Hanusch, S. Koch, P. Grunow, B. Stegemann, Electrochemical corrosion within solar panels, in: Proceedings of the 27th European Photovoltaic Solar Energy Conference and Exhibition, Frankfurt, 2012, pp. 3511–3517.
6. S. Richter, M. Werner, S. Swatek, C. Hagendorf, Understanding the snail trail effect in silicon solar modules on structural scale, in: Proceedings of the 27th European Photovoltaic Solar Energy Conference and Exhibition, Frankfurt, 2012, pp. 24–28.
7. PV degradation curves: non-linearities and failure modes10.1002/pip.2835 ↗
8. EVA encapsulants for PV modules: reliability issues and current R & D status at NREL10.1016/0960-1481(96)88879-3 ↗
9. The causes and effects of degradation of encapsulant ethylene vinyl acetate copolymer (EVA) in crystalline silicon photovoltaic modules: a review10.1016/j.rser.2017.06.039 ↗
10. The effect of encapsulant discoloration and delamination on the electrical characteristics of photovoltaic module10.1016/j.microrel.2013.07.062 ↗
11. Unlocking the secret of snail trails
12. Microscopy study of snail trail phenomenon on photovoltaic modules10.1039/c2ra22280a ↗
13. Analysis and reproduction of snail trails on silver grid lines in crystalline silicon photovoltaic modules10.1016/j.solener.2015.11.040 ↗
14. Polymer foil additives trigger the formation of snail trails in photovoltaic modules
15. Silver grid finger corrosion on snail track affected PV modules investigation on degradation products and mechanisms10.1016/j.egypro.2016.10.083 ↗
16. Study on snail trail formation in PV module through modeling and accelerated aging tests10.1016/j.solmat.2017.02.013 ↗
17. J.P. Chang, H. Yang, H. Wang, D.Y Cao, The investigation of snail trails in photovoltaic modules, in: Proceedings of the 42nd IEEE Photovoltaic Specialists Conference, New Orleans, LA, USA, 2015, pp. 1–5.10.1109/PVSC.2015.7355713 ↗
18. Investigation on performance decay on photovoltaic modules: snail trails and cell microcracks10.1109/JPHOTOV.2014.2330495 ↗
19. A defect formation as snail trails in photovoltaic modules10.4236/epe.2015.78032 ↗
20. Y.H. Chou, W.Y. Chou, S.M. Shiu, Y.C. Chien, S.Y. Huang, Chemical analysis and proposed generating mechanism for snail tracks contamination of EVA encapsulated modules, in: Proceedings of the 27th European Photovoltaic Solar Energy Conference and Exhibition, Frankfurt, 2012, pp. 3132–3136.
21. J. Wohlgemuth, S. Kurtz, Photovoltaic module qualification plus testing, in: Proceedings of the IEEE Photovoltaic Specialist Conference, Tampa, 2013, pp. 3589–3359.10.1109/PVSC.2014.6924883 ↗
22. Electrical performance results from physical stress testing of commercial pv modules to the iec 61215 test sequence10.1016/j.solmat.2008.07.008 ↗
23. Cause of degradation identified by the extended thermal cycling test on commercially available crystalline silicon photovoltaic modules
24. Performance and degradation analysis for long term reliability of solar photovoltaic systems: a review10.1016/j.rser.2013.07.046 ↗
25. J.H. Wohlgemuth, D.W. Cunningham, A.M. Nguyen, J. Miller, Long term reliability of photovoltaic modules, in: Proceedings of the Conference Record of the 2006 IEEE Photovoltaic Energy Conversion, Waikoloa, 2006, pp. 2050–2053.10.1109/WCPEC.2006.279905 ↗
26. Influence of gettering and passivation on uniformity of the electrical parameters in monolithic multicrystalline silicon solar cell10.1016/S0038-1101(03)00067-4 ↗
27. High-quality industrial n-type silicon wafers with an efficiency of over 23% for Si heterojunction solar cells10.1007/s11708-016-0435-5 ↗
28. Y.H. Lee, S.H. Chen, Y.W. Lin, M.F. Lin, W.L. Yang, K.W. Lu, H.Y. Sung, H.S. Wu, Indoor acceleration program for snail track effect in silicon solar modules, in: Proceedings of the 28th European Photovoltaic Solar Energy Conference and Exhibition, Paris, 2013, pp. 3135–3137.
29. G. Stollwerck, W. Schoeppel, A. Graichen, C. Jaeger, Polyolefin backsheet and new encapsulant supress cell degradation in the module, in: Proceedings of the 28th European Photovoltaic Solar Energy Conference and Exhibition, Paris, 2013, pp. 3318–3333.