Betts, Thomas R.Thomas R.BettsZdanowicz, T.T.ZdanowiczProrok, M.M.ProrokKolodenny, W.W.KolodennyMoor, H. deH. deMoorBorg, N. van derN. van derBorgStellbogen, D.D.StellbogenHohl-Ebinger, JochenJochenHohl-EbingerWarta, WilhelmWilhelmWartaFriesen, G.G.FriesenChianese, D.D.ChianeseGuerin de Montgareuil, A.A.Guerin de MontgareuilHermann, W.W.HermannDiaz Berrade, J.J.Diaz BerradeMoracho, J.J.MorachoCueli, A.B.A.B.CueliLagunas, R.A.R.R.A.R.LagunasGottschalg, R.R.Gottschalg2022-03-102022-03-102007https://publica.fraunhofer.de/handle/publica/35754610.1109/WCPEC.2006.2799552-s2.0-41749084355Two 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.en621conference paper