Spanish Sotysolar completes installation of 12 kW photovoltaic system with 15 kWh storage

en.Wedoany.com Reported - A 12 kW photovoltaic self-consumption system has been installed at a residence in Las Rozas, Madrid, with the project executed by photovoltaic technology company Sotysolar. The system was laid out on a southeast-facing slate roof with a 35-degree tilt, integrating power generation, storage, and backup supply functions, with the construction process facing multiple constraints.

Daniel Quintero, installation manager at Sotysolar, told pv magazine that the slate roof was the core challenge of the entire project. This material cannot be walked on or subjected to pressure, requiring the construction team to plan support points one by one and use articulated arms throughout the process. The 35-degree tilt also limited operational flexibility, requiring precise fixing of 19 mounting brackets from German manufacturer Novotegra to support 19 modules from Chinese brand Aiko Solar, model A610‑MAH72Mw.

In the building integration phase, Quintero emphasized that the design had to preserve the slate roof's characteristic "ventilation gaps (beatas de respiración)"—ventilation structures that prevent heat and moisture buildup in internal cavities. The presence of these ventilation elements directly determined the module layout and fixing positions to avoid affecting ventilation performance and roof sealing. To maintain a clean appearance, pipe routing was minimized and dedicated conduits integrated into the roof interior were used for cabling.

On the operational side, the system uses a GW10000-ES inverter from Chinese brand GoodWe as its core device, which supports backup mode, paired with a storage unit totaling 15 kWh, consisting of three GoodWe LX-U5 batteries of 5 kWh each. Quintero stated that this configuration meets the customer's electricity needs and maintains autonomous operation during grid outages.

The entire photovoltaic system covers approximately 40 square meters, with an estimated annual generation of 18,117 kWh. According to Sotysolar's calculations, without relying on subsidies, the investment payback period is 9 years; with existing aid policies and tax deductions, the payback period can be shortened to 2.5 years.