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IEC 62892-ed.1.0
Extended thermal cycling of PV modules - Test procedure
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STANDARD published on 17.4.2019
The information about the standard:
Designation standards: IEC 62892-ed.1.0
Publication date standards: 17.4.2019
SKU: NS-947695
The number of pages: 34
Approximate weight : 102 g (0.22 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC 62892-ed.1.0 :
IEC 62892:2019 defines a test sequence that extends the thermal cycling test of IEC 61215-2. It is intended to differentiate PV modules with improved durability to thermal cycling and evaluate modules for deployment in locations most susceptible to thermal cycling type stress. This document is based on the ability for 95 % of the modules represented by the samples submitted for this test to pass an equivalency of 500 thermal cycles, as defined in IEC 61215-2:2016, 4.11.3, with a maximum power degradation of less than 5 %. Provisions are also provided to reduce overall test time by increasing the maximum cycle temperature and/or the number of modules submitted for test. The test procedure in this document was developed based on analysis of the stress on tin-lead solder bonds on crystalline silicon solar cells in a glass superstrate type package. Changes to lead-free solder have an effect on the acceleration factors but not enough to change the overall results of this test. Monolithic type modules with integral cell interconnection do not suffer from this specific type of stress but there are still electrical connections within the module, for example between the integrated cell circuit and the module bus bars, that may be subject to wear out from thermal cycling. Flexible modules (without glass) are not stressed in the same way as those with glass superstrates or substrates, therefore use of the equivalency factor employed in this document may not be applicable to these modules. lIEC 62892:2019 definit une sequence dessais qui etend lessai de cycle thermique de lIEC 61215-2. Il est destine a differencier les modules photovoltaiques avec une meilleure durabilite par rapport au cycle thermique et a evaluer les modules pour un deploiement dans les lieux plus exposes aux contraintes de cycle thermique. Le present document repose sur laptitude pour 95 % des modules representes par les echantillons soumis a cet essai a supporter avec succes lequivalent de 500 cycles thermiques, conformement a la procedure definie dans lIEC 61215-2:2016, 4.11.3, avec une degradation maximale de puissance inferieure a 5 %. Des dispositions sont egalement fournies pour reduire la duree totale des essais en augmentant la temperature maximale du cycle et/ou le nombre de modules soumis a lessai. La procedure dessai decrite dans le present document a ete elaboree sur la base dune analyse des contraintes exercees sur des assemblages soudes en alliage plomb-etain sur des cellules solaires en silicium cristallin au sein dun ensemble de type superstrat de verre. Des modifications apportees a une soudure sans plomb ont un effet sur les facteurs dacceleration, mais pas de maniere suffisante pour modifier les resultats globaux de cet essai. Les modules de type monolithique avec interconnexion integrale des cellules ne souffrent pas de ce type de contrainte specifique, mais il persiste des connexions electriques a linterieur du module, par exemple entre le circuit integre de la cellule et les barres omnibus du module, qui peut subir une usure due aux cycles thermiques. Les modules souples (sans verre) ne subissent pas les memes contraintes que ceux qui comportent des superstrats ou des substrats de verre. Par consequent, lutilisation du facteur dequivalence employe dans le present document peut ne pas convenir a ces modules.
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