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Economic Viability of Photovoltaic and Battery Storage Systems for Residential Electric Vehicle Charging in Slovenia

D. Kuhar(1), J. Počivalnik(1), E. Simonič(1), B. Stergar(1), S. Seme(1,2), K. Sredenšek(1,2)

1. Faculty of Energy Technology, University of Maribor, Krško, Slovenia

2. Faculty of Electrical Engineering and Computer Science, University of Maribor, Maribor, Slovenia

2026-06-27

This paper analyzes the payback periods of investments in photovoltaic and energy storage systems under different electric vehicle charging scenarios in Slovenia, accounting for electricity cost structures. Based on fifteen-minute residential household electricity consumption data, two driving scenarios were evaluated: a high-mileage case with an annual driving distance of approximately 58,000 km and a low-mileage case of approximately 15,000 km. Electrical energy costs were calculated based on the currently applicable electricity billing methodology in Slovenia. Photovoltaic power production was estimated using solar irradiation data corresponding to the system location, module tilt angle, and available installation area on the analyzed residential building. The results present the charging behavior of the energy storage system in relation to household electricity consumption and photovoltaic production. In addition, the impact of integrating an electric vehicle charging station on the electricity consumption profile is assessed. The analysis further identifies the scenarios in which investments in photovoltaic systems and energy storage achieve shorter payback periods, considering the applied electricity pricing and credit note scheme.

Key words: electricity production, battery storage unit, payback period, electric vehicle, electricity cost

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