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Investigation of Aging Phenomenon and Power Drop Rate with Field Exposed PV Modules
In this paper, we studied and analyzed the degradation phenomenon and the power drop for 53 sites among photovoltaic (PV) module sites installed between 1988 and 2008 year in Korea. In this time, Installation capacity and number of site was 357 MW and 25,870 PV sites were established during 1988-2008. In this study, PV modules from 4 sites exposed for 20 years in the field showed humidity intrusion, EVA sheet de-lamination, electrode oxidation, yellow discoloring, white discoloring and glass breakage. The degradation of PV module from these sites was seen to be about 100 % by the naked eyes test and seemed to be too aged to work properly. However the power output of these PV modules got reduced only by about 20-30 % of the initial production value. The PV modules from 10 sites used for ~10 years in the field showed the similar degradation phenomenon to ones for ≥20 years old and the aging degree was about 80 %. In here, the drop rate of power output was 13.5 - 57.9 %, compared to the initial power output. The degradation phenomenon was also found in PV modules used for ~5 years and about 30 % of these PV modules showed electrode oxidation, humidity intrusion, de-lamination, white discoloring and bus bar ribbon oxidation. Some of modules had yellow discoloring, cell corrosion, power cable corrosion, insulation breakage, back sheet white discoloring and et al. The degradation rate of these modules was ~30 % and power output drop was 13-13.5 % of the initial one. The some PV modules installed recently, less than 5 years, also showed electrode oxidation, de-lamination, yellow discoloring, hot spot. The aging rate and power output drop were ~10 % and 1.7 - 14.6 % with very wide variations, respectively. This paper is the final report of ‘Degradation investigation analysis of the field aged PV modules’ sponsored by ‘New and Renewable Energy R&D policy’ of Korea government from 2007 to 2010 year.
G.-H. Kang, K.S. Kim, H.-E. Song, G.-J. Yu, H.K. Ahn, D.-Y. Han
Degradation, Photovoltaic (PV) Module, Photovoltaic (PV), Field Exposed PV Module
Components for PV Systems
Subtopic: PV Modules
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 4AV.3.17
4015 - 4018
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-4AV.3.17
0,00 EUR
Document(s): paper