Two sets of modules have been sent around to different testing installations across Europe, one set to laboratories performing indoor calibrations and one set to laboratories performing outdoor power and energy ratings. The results show that for crystalline and polycrystalline devices, a very good agreement between laboratories has been achieved. A lower agreement between laboratories has been achieved for thin film devices and further need for research is identified.

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In this paper, a new approach to data acquired during monitoring of PV systems is proposed. It is based on modern informatics tools, like the commonly used XML or as well as new web services. The goal is to propose a universal data scheme (PVML) allowing analysis of the performance of a PV system of any type and size. Such an approach should be helpful in detection of faulty operation or even underperformance of the PV systems. The work has been carried out in the framework of the EC-funded Integrated Project PERFORMANCE.

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