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Failure Classification of Defective PV Modules Based on Maximum Power Point Analysis
F.W. Fecher, T. Pickel, C. Buerhop-Lutz, C. Camus, C.J. Brabec
Defects, Degradation, Simulation, PV Module, Photovoltaic (PV)
Operation, Performance, Reliability and Sustainability of Photovoltaics
Subtopic: PV Cells and Modules
Event: 32nd European Photovoltaic Solar Energy Conference and Exhibition
Session: 5BV.4.27
2252 - 2254
ISBN: 3-936338-41-8
Paper DOI: 10.4229/EUPVSEC20162016-5BV.4.27
0,00 EUR
Document(s): paper, poster


Photovoltaic (PV) modules are often affected by defects caused by transport and installation or by field degradation due to environmental conditions. If a power reduction is observed in the inverter data, a detailed error cause analysis is often very cost-intensive even when using imaging methods like thermography or electroluminescence. We present a method to classify the defect type of PV modules only by evaluating the maximum power output (Pmpp) for different irradiances. Thereby, low parallel resistance, high series resistance and broken cells can be distinguished from each other. Simulations and consistent explanations confirm the experimental findings. The method works particularly well for parallel resistance problems like potential induced degradation (PID). Thus, this failure type can easily be diagnosed in modules. The method should also be applicable to data of module strings and to thermography-based failure analysis in field which will be investigated in the future.