Accelerating Cyclic Loading

Keywords

cracks; cyclic load testing; mechanical load testing; photovoltaic modules; reliability; silicon

Abstract

In this work, we performed four variations of cyclic load testing on four groups of modules using the LoadSpot tool. Each group first underwent 50 thermal cycles (TC50), 10 humidity-freeze cycles (HF10), and a 2400 Pa static load. Then, the baseline group was tested using standard cyclic loading conditions from IEC 62782, another with double the loading frequency, one with larger loading magnitude, and one with smaller loading magnitude and quadruple the loading frequency. Interestingly, we found that increasing the loading frequency actually reduces maximum power degradation with respect to the baseline, whereas increasing or decreasing the load amplitude respectively increases or decreases maximum power degradation with respect to the baseline. In order to confirm the results, we conducted another experiment with a new group using modules of a different make and model. This group did not undergo TC50 nor HF 10, only a 5400Pa static load to create cracks. For this group, the maximum power degradation did not show a dependence on the loading frequency during cyclic loading. We offer a possible explanation for this unexpected result associated with increasing the loading frequency.

Publication Date

11-26-2018

Publication Title

2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC

Number of Pages

1328-1332

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/PVSC.2018.8547310

Socpus ID

85059895535 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85059895535

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