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How fast does an MPP tracker really need to be?

: Schmidt, H.; Burger, B.; Bussemas, U.; Elies, S.


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
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Conference Paper
Fraunhofer ISE ()

One essential question regarding Maximum Power Point Trackers (MPPTs) is how fast an MPP tracker must be so that no unduly high energy losses occur. This question has been discussed controversially in the past, and many of the statements have not been based on real measurements, but manly on assumptions and wishful thinking of the companies’ advertising department. In this article, various influences on the position of the MPP and their typical time constants will be presented. These are compared to the reaction time or speed of typical MPP search procedures. In particular, measurement results from a real solar generator will show that the partial shading caused by rapidly passing clouds and the associated significant short-term changes in the MPP voltage are not relevant to the energy output of the whole system.