Evolution of cell cracks in PV-modules under field and laboratory conditions

Beitrag in einer Fachzeitschrift

Details zur Publikation

Autor(en): Buerhop C, Wirsching S, Bemm A, Pickel T, Hohmann P, Nieß M, Vodermayer C, Huber A, Glück B, Mergheim J, Camus C, Hauch J, Brabec C
Zeitschrift: Progress in Photovoltaics
Jahr der Veröffentlichung: 2017
ISSN: 1062-7995
Sprache: Englisch


Damaged modules, especially with cell cracks, can be observed quite often in photovoltaicinstallations.

Little knowledge exists about long‐term stability of precracked modules at real operating

conditions. Previous investigations and existing standards focus on the degradation of new,

defect‐free modules. This work highlights a twofold approach for life‐time study of precracked

modules: (1) outdoor exposure of 54 precracked modules for 1 year and (2) artificial stressing

of 20 representative precracked modules with a novel load test setup simulating snow and wind loads. The outdoor exposure reveals that at moderate weather conditions, no changes were detectable, neither in electric performance nor in EL‐images. However, the accelerated static load tests with stepwise increasing pressures point out that above a certain threshold, cracks grow.

Below this threshold, formerly unseen cracks become visible at the loaded stage. In addition,

modules with a smaller number of damaged cells have a stronger tendency to degrade further

than modules with an already large number of cracked cells. Remarkably, the power output measured with a solar simulator after a stress test up to 2500 Pa (describing conservative proof conditions for severe snow loads according IEC 61215) remains unchanged for almost all modules.

FAU-Autoren / FAU-Herausgeber

Brabec, Christoph Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Materialien der Elektronik und der Energietechnologie)
Mergheim, Julia PD Dr.
Lehrstuhl für Technische Mechanik
Wirsching, Sven
Lehrstuhl für Konstruktionstechnik

Autor(en) der externen Einrichtung(en)
ADLER Solar Services GmbH
Allianz Risk Consulting GmbH, AZT
Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern)
ECOlution Engineers UG


Buerhop, C., Wirsching, S., Bemm, A., Pickel, T., Hohmann, P., Nieß, M.,... Brabec, C. (2017). Evolution of cell cracks in PV-modules under field and laboratory conditions. Progress in Photovoltaics. https://dx.doi.org/10.1002/pip.2975

Buerhop, Claudia, et al. "Evolution of cell cracks in PV-modules under field and laboratory conditions." Progress in Photovoltaics (2017).


Zuletzt aktualisiert 2019-27-02 um 17:00