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A scheme is presented for modelling the observed seasonal variation of output power of thin-film single junction amorphous silicon a-Si photovoltaic PV arrays using laboratory measured parameters and historical climatic data. The model is based on parameters derived from controlled light-soaking and annealing experiments. The traditional alpha and beta, with respectively positive and negative response, are counteracted by an additional annealing coefficient with a slow positive response. The model is compared to monitoring data of the ELSA facade at the JRC Ispra in northern Italy. We demonstrate that a-Si:H PV facades may be modelled by a combination of temperature coefficients, a knowledge of annealing behaviour of light-soaked modules and a record of the climate conditions at the installation. This is interpreted as a positive temperature coefficient for the a-Si facade.

Additional information

Authors: DUNLOP E D, DJL Software Consultancy Ltd, Jarrow (GB);HELMKE C, IST EnergietechnikGmbH, Augsburg (DE);JANTSCH M, Fraunhofer-Institute for Solar Energy Systems, Freiburg (DE);OSSENBRINK H A , JRC Ispra(IT)
Bibliographic Reference: Paper presented: 13th European Photovoltaic Solar Energy Conference, Nice (FR), October 23-27, 1995
Availability: Available from (1) as Paper EN 39422 ORA
Record Number: 199512072 / Last updated on: 1996-01-15
Original language: en
Available languages: en
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