ECN publication
Building integration of photovoltaic power systems using amorphous silicon modules : irradiation loss due to non-conventional orientations
Published by: Publication date:
ECN Solar Energy 1-12-2001
ECN report number: Document type:
ECN-C--01-068 ECN publication
Number of pages: Full text:
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In October 1998 an existing office building of ECN was retrofitted with four photovoltaic power systems with single junction amorphous silicon modules. The purposes of the retrofit and the corresponding monitoring activities were the following:- demonstration of the applied technology for building integration, - generation of general knowledge on irradiation in the built environment with non-optimal orientations, - collection of specific knowledge on the applied PV-systems. The monitoring data were used to validate generally available simulation models on the effects of orientation, shading, reflection, frequency distribution and spectral distribution of the irradiance. The results of the monitoring and of the modelling were combined to quantify the performance of the PV-systems. The most important results are: - Models are available for the quantification of the effect of orientation, shading, reflection and low irradiance. The models for shading were not validated sufficiently. - The relevance of the spectral effect for a-Si has been demonstrated. A model for the quantification of its annual effect is not available. - The performance was quantified of the PV-systems on the North, East, South and West fa├žade. - The modules show a beginning delamination after an operation period of 24 months. - The inverters have performed properly. However a more appropriate selection of the inverter, based on the actual array power distribution rather than on the nominal array power, would increase the performance.

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