Programm Photovoltaik Ausgabe 2008 ... - Bundesamt für Energie BFE

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� 4 energy rating comparison were performed for third-parties.
� In test cycle 10 the power at the purchase of c-Si module was on average 1.5% lower with respect
to Pn but ranging from 0.2% and -3.8%.
� Stabilized power of c-Si module after 15 months is on average 3.7% lower with respect to Pn and
ranging from -0.7% and -8.2%. All type of modules are in the warranty limits.
� Despite during the last few years the accuracy of power declarations has improved constantly,
warranty limits are sometimes unclear.
� Initial power degradation {(P0-Pa)/Pa} of c-Si modules is on average – 1.1%, ranging from +0.6%
to -2.9%.
� In the standard modules with c-Si cells, the average reduction after one year of exposure (from
P3 to P15) in almost cases were very low, ranging from -0.5% and -2.0%.
� Differences in annual energy production [kWh/kWp], of 14 different module types, with nominal
power Pn as reference, reach 10%.
� For Lugano, the indoor measured power matrix is able to explain a large part of the differences in
kWh observed under real operating conditions.
� High resolution data of a single day (1 minute intervals) are sufficient to determine the power matrix
of a module when fitting the raw data to the equations 1 and 2 of the matrix method [2].
� The new homepage www.bipv.ch was completed with new BIPV product examples.
5 References
[1] D. Chianese et. al.: Direct Performance Comparison of PV Modules, 22 nd EPVSEC, Milan (I), 2007.
[2] G. Friesen et al.: Energy Rating Measurements and Predictions at ISAAC-TISO, 22 nd EPVSEC, Milan (I), 2007.
[3] Kim Nagel, Physical properties of PV modules used as glasses in the building sector, Solar Glass Conference 2007,
Milano (I), November 2007.
[4] Chianese D., Nagel K., Pola I., BiPV Projekte, 4. Workshop “Photovoltaik-Modultechnik”, November 2007, Köln (D).
[5] D. Chianese, K. Nagel, “WWW.BIPV.CH”, 9. Symposium Photovoltaïque National, Emmenbrücke, Novembre 2007.
[6] www.isaac.supsi.ch ; www.bipv.ch
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