Title: Performance Measurements of CIS Modules: Outdoor and Pulsed Simulator Comparison for Power and Energy Rating
Citation: Proceedings of Photovoltaic Energy Conversion - WCPEC (A Joint Conference of PVSC, PVSEC & PSEC) p. 2058-2061
Publisher: IEEE
Publication Year: 2006
JRC N°: JRC32728
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC32728
Type: Articles in periodicals and books
Abstract: CIS PV technology has demonstrated relatively high module efficiencies and is becoming established in the market for standard applications. The method for energy yield prediction based on performance surfaces under development at the ESTI laboratory uses the module temperature and incident irradiance as independent variables and has proved successful in prediction of real energy production for crystalline Si modules. However, the determination of an energy rating of CIS modules is more complex and it was found to be difficult to accurately predict the module performance based on simulator measurements. The Energy Rating procedure is based on determining the maximum power point Pmax as a function of the irradiance and the ambient temperature using pulsed simulator measurements. Short and long term outdoor measurements have been performed in order to test the method's accuracy. It has been observed that the power measured on the simulator is in general lower than that measured outdoors and this is a significant cause of the difficulties in making accurate energy predictions. The short circuit current has not been found to be different, however, rather the difference is due to lower open circuit voltage and fill factor. It is known that light soaking can increase these parameters, and a study has been made of the short term effect of light soaking on the module. It has been found that the light soaking does increase the power measured on the simulator, but the light soaking loses its effect very quickly, and it is therefore important to measure the module very quickly following the light soaking. The effect of the measurement speed has also been studied by varying the time taken to perform the IV scan, since this is also a key difference between the indoor and outdoor measurements.
JRC Directorate:Sustainable Resources

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