German startup launches high-voltage sodium-ion battery for residential applications

German startup Revolta has launched a high-voltage battery storage system for residential applications based on sodium-ion technology. Each battery module has a capacity of 2.0 kWh, and up to 10 modules can be connected in parallel, enabling the system to reach a total capacity of 20 kWh.

The sodium-ion storage unit has a compact design, measuring 284 mm × 186 mm × 260 mm and weighing 19 kg. The module configuration can be freely adapted to scale the system according to individual requirements. A control unit provides the interface between the battery and the inverter. Revolta said it will continue expanding its list of compatible inverter models as manufacturers grant the required approvals.

According to the company’s datasheet, the system has an energy density of 105 Wh/kg and a nominal voltage of 450 V DC. Charge and discharge power varies between 0.6 kW and 1.2 kW depending on the state of charge, Revolta said. The storage system achieves an efficiency of more than 95%. It has an IP65 protection rating and holds several certifications. Noise emissions are specified at below 40 dB, while standby losses are described as very low.

Revolta claims the battery can remain in standby for more than one year without requiring a recharge.

The sodium-ion storage system is designed for simplified installation. Commissioning is carried out through a “plug-and-play over-the-air” process, which can be completed via the company’s smartphone app or Bluetooth connection, Revolta said.

Revolta presented its sodium-ion residential storage system at this year’s The smarter E trade fair in Munich. The official market launch is scheduled for September, a company spokesperson told pv magazine. Several pilot projects are already planned.

The company said it is receiving daily inquiries from end customers, who are generally directed to suitable local installers. “We are targeting the traditional three-tier distribution model, moving from wholesalers to installers, and are already in initial discussions with distributors,” the spokesperson said. Revolta expects its sales network to be fully established by 2027.

The company plans to initially focus on the German market, while also preparing for expansion into other European countries. As the high-voltage storage system connects directly to the inverter rather than the grid, there are no major technical obstacles to entering additional markets, according to the spokesperson.