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Title: Interlaboratory comparison of short-circuit current versus irradiance linearity measurements of photovoltaic devices
Authors: Bliss, Martin
Betts, Thomas R.
Gottschalg, Ralph
Salis, Elena
Mullejans, Harald
Winter, Stefan
Kroeger, Ingo
Bothe, Karsten
Hinken, David
Hohl-Ebinger, J.
Keywords: Photovoltaics characterization
Linearity measurement
Interlaboratory comparison
Uncertainty
Issue Date: 2019
Publisher: © International Solar Energy Society. Published by Elsevier
Citation: BLISS, M. ... et al., 2019. Interlaboratory comparison of short-circuit current versus irradiance linearity measurements of photovoltaic devices. Solar Energy, 182, pp. 256-263.
Abstract: This work presents the results of the first interlaboratory comparison of linearity measurements of short-circuit current versus irradiance that includes a wide variety of photovoltaic (PV) device types, from reference cells to full-size modules. The aim of this inter-comparison was to compare the methods employed and to collect new inputs useful for the revision of the standard IEC 60904-10, which deals with linearity measurements for PV devices. The procedures and facilities employed by the partners include the differential spectral responsivity, the white light response, the solar simulator method and the two-lamp method. The facilities are generically described and compared and their main sources of uncertainty are discussed. Comparison results show good agreement within declared uncertainties between all partners. A few minor exceptions under low-light conditions raise questions of possible uncertainty underestimation for these specific conditions. The overall outcome of the comparison also highlights the importance of considering correlations in the uncertainty budget, which can potentially improve the overall stated uncertainty. A critical review is made of the data analysis adopted in the standard IEC 60904-10 to calculate the linearity degree of the short-circuit current towards irradiance. The analysis review suggests a way to make results based on different methods more comparable and less prone to erroneous linearity assessment.
Description: This paper is in closed access until 28th Feb 2020.
Sponsor: The research work leading to this article was carried out within the EMRP ENG55 project Towards an Energy-based Parameter for Photovoltaic Classification. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.
Version: Accepted for publication
DOI: 10.1016/j.solener.2019.02.031
URI: https://dspace.lboro.ac.uk/2134/37120
Publisher Link: https://doi.org/10.1016/j.solener.2019.02.031
ISSN: 0038-092X
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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