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LeTID Impact on Bifacial Modules Using Accelerated Aging Tests, Electroluminescence and PV Plant Modelling
J. Dupuis, G. Plessis, G. El Hajje, E. Lajoie-Mazenc, E. Sandré, K. Radouane, P. Dupeyrat
Bifacial, Simulation, PV Module, LeTID, Plant Performance
Photovoltaic Modules and BoS Components
Subtopic: PV Module Design, Manufacture, Performance and Reliability
Event: 37th European Photovoltaic Solar Energy Conference and Exhibition
Session: 4BO.12.6
802 - 810
ISBN: 3-936338-73-6
Paper DOI: 10.4229/EUPVSEC20202020-4BO.12.6
0,00 EUR
Document(s): paper, presentation


The authors report on the Light and elevated Temperature Induced Degradation effect (LeTID) observed on bifacial photovoltaic modules and its potential impact on photovoltaic plants performance. Indoor LeTID quantification using indoor Carrier Induced Degradation (CID) is carried out using current injection. Power measurements yielded higher LeTID sensitivity for the rear side of bifacial modules compared to the front side hence leading to a variation of the bifaciality factor by several percentage points. The difficulty in evaluating the maximal power degradation caused by LeTID is also highlighted as a reduced number of samples is used most of the time and as cells within a single module don’t have always the same performance evolution trends. Using indoor CID results with the help of empirical fitting and Arrhenius relation, the yield impact of LeTID on a bifacial power plant is simulated under three different climates. Modelling results help to identify the main parameters related to LeTID modules sensitivity that impact PV plants yield: maximal power degradation, stabilized power value after regen-eration, activation energy value and LeTID kinetics. In some cases, the yield variation caused by LeTID sensitive modules could be mitigated by carefully selecting the modules as a function of climatic conditions.