Technical Design Report for a Photovoltaic Self-Consumption Installation with Surplus Injection

Rodolfo Luis Fernando García Galvis(1), Carlos Ponce Corral(2) and José Antonio Domínguez Navarro(1,3) 1. School of Doctorate, PhD Program in Renewable Energy and Energy Efficiency, Zaragoza University (Spain) 2. Department of Industrial Engineering and Manufacturing – Autonomous University of Juárez City, UACJ, Cuidad Juárez, Chihuahua (México) 3. Department of Electrical Engineering - EINA Zaragoza University, Zaragoza (España) 2026-02-15

Abstract

This technical report documents a photovoltaic(PV) installation with self-consumption and surplus injection installed in Spain, which was designed for residential consumption and started up in an isolated single-family home with connection to the electricity distribution grid. Photovoltaic solar panels, inverter, lithium-ion batteries and a bidirectional meter have been integrated by this system. The report details the system’s technical requirements, energy flow, electrical calculations, economic analysis and compliance with Spanish regulations.

Key words: Solar, battery, two-way, metering, self-consumption.

References

[1] Royal Decree 244/2019 – Spanish self-consumption regulation.

[2] www.ine.es INE Instituto Nacional de Estadística

[3] Nonnenmacher, Tom & Nelson, Jenny & Winchester, Benedict. (2023) Maximum Return on Investment for a Domestic Photovoltaic Installation. arxiv.org/math/abs/2310.09323

[4] Galilea, Carlos & Pascual, Julio & Berrueta, Alberto & Ursua, Alfredo & Marroyo, Luis. (2019). Economic analysis of residential PV self-consumption systems with Li-ion batteries under different billing scenarios. 1-6. 10.1109/EEEIC.2019.8783551.

[5] Roldan-Fernandez, Juan & Burgos-Payán, Manuel & Santos, Jesús. (2020). Profitability of Household Photovoltaic Self-Consumption in Spain. Journal of Cleaner Production. 279. 123439. 10.1016/j.jclepro.2020.123439.

[6] López Prol, Javier & Steininger, Karl. (2017). Photovoltaic self-consumption regulation in Spain: Profitability analysis and alternative regulation schemes. Energy Policy. 108. 742-754. 10.1016/j.enpol.2017.06.019.

[7] IEC/UNE Standards – Electrical safety and photovoltaic design.

[8] https://re.jrc.ec.europa.eu/pvg_tools/es/ PVGIS (Photovoltaic Geographical Information System)

[9] www.idae.es PCT‐C‐REV ‐ julio 2011.

[10] www.aemet.es Agencia Estatal de Meteorología (AEMET [11] www.iea-pvps.org National Survey Report of PV Power Applications in Spain 2023.