First residential sodium-ion energy storage system installed in Germany. Revolta launches pilot project

Frankfurt-based German startup Revolta has installed and commissioned its first commercial energy storage system based on sodium-ion technology. The system was installed at a private customer’s property in Aschaffenburg. We recently reported on the launch of sales of this solution, and the manufacturer has now moved into the practical deployment phase. This marks an important step in the development of sodium-ion batteries for the residential market.

Unique location and technical specifications

The system was installed at a former mill property. The building already has a small hydropower plant and a 20 kW photovoltaic installation. The property owner had deliberately waited for sodium-ion technology to become available in order to increase their energy independence.

The installed energy storage system has the following specifications:

• Capacity – 10 kWh (consisting of five 2 kWh modules).
• Voltage – a high-voltage system operating at a nominal voltage of 450 V.
• Power output – up to 4 kW (charging and discharging take 2.5 hours).
• Design – each 2 kWh module weighs 18.7 kg and uses just three large sodium-ion cells.
• Energy density – 141 Wh/l and 107 Wh/kg.

The entire system operates with a well-established SMA inverter. The module enclosures meet the IP64 protection standard.

The project is currently in the pilot phase. Revolta plans to install additional systems for selected customers in Germany over the coming weeks.

The systems delivered will be equipped with additional measuring instruments. The data collected will help engineers refine the firmware and battery management system.

Prices and market availability

Demand for sodium-ion energy storage systems has proven exceptionally high. The manufacturer announced that its entire allocation of units planned for 2026 has already sold out.

The company has now begun accepting reservations for 2027. Customers who pay a deposit will receive priority for deliveries.

The price of a single 2 kWh module is 599 euros. A set consisting of five modules costs 2,995 euros. However, this amount does not include the remaining installation components. The project is supported by the European Regional Development Fund through the German state of Hesse.