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Photovoltaic self-consumption after the support period: Will it pay off in a cross-sector perspective?

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  • Klamka, Jonas
  • Wolf, André
  • Ehrlich, Lars G.

Abstract

We quantify the cost savings potential of photovoltaic self-consumption by single-family houses with small-scale roof-top photovoltaic systems in Germany against the background of recent storage applications after the end of the legal support period. We analyze different systems where an already installed PV system is combined with a battery storage and/or a power-to-heat solution. A comparison is made in terms of a household’s electricity and heating costs under cost-minimizing operation of each system. For this purpose, we carry out comprehensive simulations of site-specific PV production and determine optimal self-consumption as well as optimal charging of the hot water thermal storage and the battery storage. We use 25 representative electricity load profiles, which differ only in temporal distribution of consumption, to obtain a broader picture of the cost savings potential. Results suggest that the major share of the savings potential is due to direct PV self-consumption and thus concerns electricity costs. A profitability analysis reveals that the inclusion of the thermal storage and/or the battery storage system does not pay off when juxtaposing cost savings and investment expenses, at least at current prices. However, since storage application prices are constantly falling, individual profitability is within reach for the next years.

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  • Klamka, Jonas & Wolf, André & Ehrlich, Lars G., 2020. "Photovoltaic self-consumption after the support period: Will it pay off in a cross-sector perspective?," Renewable Energy, Elsevier, vol. 147(P1), pages 2374-2386.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:2374-2386
    DOI: 10.1016/j.renene.2019.10.033
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    4. Luis Cámara-Díaz & José Ramírez-Faz & Rafael López-Luque & Francisco José Casares, 2021. "A Cost-Effective and Efficient Electronic Design for Photovoltaic Systems for Solar Hot Water Production," Sustainability, MDPI, vol. 13(18), pages 1-21, September.

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