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Dynamic mechanical loads on PV-modules

: Assmus, M.; Jack, S.; Koehl, M.; Weiss, K.-A.


Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
S.3395 - 3397
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Fraunhofer ISE ()

Photovoltaic (PV)-modules are not only exposed to static mechanical loads, such as snow and wind loads (for building integrated modules), as tested in the current standard IEC 61215. The highly dynamic loads occur when wind triggers oscillations. It is obvious that the dynamic loads are more likely to cause fatigue of materials, especially of PV-cells and connecting wires. The dynamic behavior of modules with different designs and sizes is analyzed by different methods. Outdoor measurements of the deflection show the dynamic behavior of different types of modules under wind loads and the correlation between wind speed and deflection. Numerical calculations, based on FEM-modeling, showed that their resonance frequencies are typically in the range from 1Hz to 100Hz, depending on the modes. Results of the outdoor measurement and numerical simulations are reported.