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This paper presents the development of a PV irradiance reference ball and secondly a proposal for a PV application performance label. The aim of the PV irradiance reference ball is to assess reference irradiance data for PV systems for which boundary conditions give an important impact on the performance, such as for building integrated PV systems. The device should provide information to bridge the gap between standard test condition (STC) laboratory measurements, nominal operating cell temperature (NOCT) measurements performed outdoors under optimal free rack conditions and built environmental conditions and for various types of cell materials. BIPV conditions, for which numerous applications emerge nowadays with full or partial integration of PV products, are often far from the standardized STC or NOCT conditions. Therefore a proposal is presented that PV product manufacturers might find useful to add as a kind of an applications performance label (APL) to the technical specifications of their PV modules. This label is derived from the performance versus irradiance curves as can be assessed from standardized conditions and the condition that the PV module is insulated at the rear, in fact the worst condition for PV energy performance. Initial results from field measurements at the JRC in Ispra are presented.

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Authors: BLOEM J J, JRC, IES, Renewable Energies Unit, Ispra (IT);ZAAIMAN W, JRC, IES, Renewable Energies Unit, Ispra (IT);FERRAZZA F, Eurosolare, Nettuno (IT);NACCI R, Eurosolare, Nettuno (IT)
Bibliographic Reference: An oral report given at: The 17th European Photovoltaic Solar Energy Conference and Exhibition. Held in: Munich (DE), 22-26 October 2001
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