Sustainability and cost-effectiveness were key priorities from the outset of the school extension project in Kelsterbach, Germany. It was therefore clear at an early stage that the energy concept should be complemented by a high-performance energy storage system.
The goal was to implement a robust outdoor solution that intelligently integrates the two existing photovoltaic systems and maximizes the self-consumption of the electricity generated on site. This enables a greater share of self-generated energy to be used directly where it is produced, reduces reliance on grid electricity, and lowers energy costs in the long term.
Client
- School
- Kelsterbach, Germany
- Approx. 2.5 MWh electricity consumption on weekdays and approx. 600 kWh on weekends
- Two PV systems with a total installed capacity of 300 kWp
Project Details
- FENECON Industrial S
- Power: 184 kW
- Capacity: 164 kWh
- Partner: DEF
- Installer: FENi Solar GmbH
FEMS Apps Used
- FEMS App – Self-Consumption Optimization
Results
The self-consumption rate increased from 58% to 76% (measured data from March 2026). This corresponds to an annual CO₂ reduction of approximately 107 tons, of which 24.6 tons are achieved by the battery storage system alone.
Energy Journey
This project was designed with the future in mind from the very beginning, with the battery energy storage system forming an integral part of the overall energy concept. Thanks to FENECON's flexible solution, the school is already well prepared for future requirements. It is an important step toward a reliable, future-proof, and sustainable energy supply. The project also highlights the successful collaboration between our partners DEF and FENi Solar. Together, we demonstrated that an intelligently integrated battery energy storage system delivers tangible added value in both modernization and new-build projects, whether for public institutions, commercial enterprises, or private buildings.
