Fraunhofer ISE Offers Accurate PV Module Energy Rating System

Fraunhofer ISE Offers Accurate PV Module Energy Rating System

Time: 6/17/2013 9:58:09 AM                       Publisher: Staff
Targeting PV power plant owners and investors, Fraunhofer ISE is offering a PV module energy rating analysis using real environmental effects to provide greater accuracy on energy yield of PV power plants and commercial installations around the world.
“Up to now the data sheet and the manufacturer’s specifications have served as the basis for the energy yield assessment when planning photovoltaic systems,” said Boris Farnung, head of the calibration team at Fraunhofer ISE. “In practice, however, there is often a discrepancy between the manufacturer’s specifications and the laboratory measurements. Only with uniform power rating measurements, is it possible to determine benchmarks for different module types at a given location. When the solar irradiation over a day sinks to one fifth the standard value of 1000 W/m², the efficiency decreases two to five percent. In addition, losses due to higher operating temperatures are measureable at Central European locations and become more evident in southern locations.”
 
Using meteorological data at a given project location and site, Fraunhofer ISE via its labs takes measurements under lab conditions that include a measurement uncertainty of only 1.8% for crystalline modules, which are claimed to be of the highest precision worldwide.
 
According to Fraunhofer ISE, emphasis is being placed not only on electrical measurements but, in respect to utility-scale, also on statistical methods to check the nominal power. The research institute is also undertaking special analysis procedures such as electroluminescence to locate hidden faults, like micro cracks.
 
Source:http://www.pv-tech.cn/news/lang_en/fraunhofer_ise_offers_accurate_pv_module_energy_rating_system

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