Volume 14, 2023
Special Issue on ‘WCPEC-8: State of the Art and Developments in Photovoltaics’, edited by Alessandra Scognamiglio, Robert Kenny, Shuzi Hayase and Arno Smets
|Number of page(s)
|Modules and Systems
|16 March 2023
Evaluating the effects of photovoltaic module heating during electroluminescence inspection
Institute for Renewable Energy, EURAC Research, Viale Druso 1, Bolzano 39100, Italy
2 Dipartimento di Energia, Politecnico di Milano, Via Lambruschini 4, 20156 Milano, MI, Italy
3 Huawei Nuremberg Research Center, Power Conversion Technology Laboratory, Nürnberg, Germany
* e-mail: email@example.com
Received in final form: 18 October 2022
Accepted: 9 January 2023
Published online: 16 March 2023
The application of electroluminescence imaging of photovoltaic modules increased in the last years, due to the reliable and detailed identification of degradation and failures. In future plants the time-consuming connection of power supplies could be overcome by use of inverters with bi-directional functionality, allowing backpowering of connected module strings directly. Temperature influences the open-circuit voltage of photovoltaic modules and must therefore be considered during backpowering. This work investigates the heating due to backpowering of photovoltaic modules of different types during electroluminescence inspection. The temperature increase until saturation is estimated by energy balance calculations and experimentally verified to be around 20 °C, with resulting voltage drops of up to 3 V. Further, these changes have an effect on the recorded luminescence intensity: a decrease of the electroluminescence signal intensity between beginning of backpowering and reaching saturation temperature is shown. For application of the results to a real-world scenario, the electroluminescence window of an electroluminescence-ready inverter is introduced, giving the boundaries of current and voltage that can be supplied. Combined with a simulation of the dark current–voltage curves of a connected photovoltaic module string, the electroluminescence inspection possibilities are visualized. Finally, the applicability of this heating phenomenon for snow melting is discussed.
Key words: PV inspection / operation and maintenance / electroluminescence / snow melting
© L. Koester et al., Published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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