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Title:
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Determination of the irradiation dependent efficiency of multicrystalline Si PV modules on basis of IV curve fitting and its influence on the annual performance
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Author(s):
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Published by:
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Publication date:
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ECN
Solar Energy
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1997
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ECN report number:
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Document type:
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ECN-RX--97-045
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Article (scientific)
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Number of pages:
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6
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Published in: Paper, presented at the 14th European photovoltaic solar energy conference and exhibition, 30 June - 4 July, 1997, Barcelona, Sp (), , , Vol., p.-.
Abstract:
PV modules can be characterised by their maximum power at Standard TestConditions, STC. It is well known that PV modules rarely operate under these
circumstances. For a calculation of the annual energy collection the
efficiency of the module as a function of the irradiance should be known, as
well as the influence of the module temperature, the spectral distribution of
the light and the angle of incidence, on the maximum power point of the
module. It is investigated how well the efficiency of a particular set of
multicrystalline PV modules at light intensities and module temperatures
other than at STC can be predicted from a limited number of outdoor I-V
measurements and their characteristic two-diode model parameters of the I-V
curves. Some model parameters were found to depend on the irradiance. The
efficiency curve calculated on basis of the two-diode model and the
experimentally determined efficiency curve were used to calculate the yearly
energy collection for two locations. 7 figs., 3 tabs., 6 refs.
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