Cambridge-based cleantech startup Eleven Energy has launched its new residential sodium-ion storage solution at the Smarter E event in Munich, Germany, this week.
The company said it has already deployed its systems in several hundred homes, supported by a nationwide installer network of more than 100 certified partners, marking one of the first large-scale residential sodium-ion field implementations in Europe.
“The opportunity for sodium-ion is strongest where storage is part of a complete energy system, not just a cell chemistry,” Yichen Shi, CEO and co-founder of Eleven Energy, told pv magazine. “For residential and commercial storage, we are designing around sodium from the battery module to the inverter, software and installer experience. Our aim is to make storage safer, more sustainable and practical for everyday solar and tariff optimisation.”
The new product consists of an integrated stack comprising dedicated sodium-ion battery modules, hybrid inverters engineered for sodium voltage characteristics, and an AI-driven energy management platform designed to optimize self-consumption, tariff arbitrage, and system longevity. Eleven Energy said this approach reflects a broader shift in stationary storage design: away from chemistry-agnostic “drop-in” batteries and toward co-engineered systems where hardware and software are tightly coupled.
At the core of Eleven Energy’s residential offering is the Galvani Battery Module, a stackable unit designed specifically for stationary storage applications rather than high energy density transport use cases. Each module provides 4.5 kWh of usable capacity based on a nominal 45 V architecture, operating across a voltage window between 33 V and 59.2 V. The system is capable of delivering 100 A charge and discharge current per module, scaling to 200 A in multi-module configurations for larger residential loads or hybrid solar-plus-storage systems.
Depth of discharge is another area where the sodium-ion design is leveraged rather than constrained. The system delivers 92% usable capacity in grid-tied operation, extending to 95% in off-grid backup scenarios.
The IP65-rated modules are designed for both indoor and outdoor deployment and can charge between -20 C and 55 C, with discharge capability extending down to -30 C. This significantly reduces the need for energy-intensive thermal management systems often required in lithium-ion installations in colder climates, the manufacturer said.
Reflecting its focus on stationary durability over energy density, Eleven Energy backs the system with a 10-year or 8,000-cycle warranty.
To complement its sodium-ion battery hardware, Eleven Energy has developed a dedicated inverter portfolio engineered specifically for sodium’s voltage behavior and system dynamics. The range spans single- and three-phase units: compact 3.6–6 kW models for standard homes (up to 9 kW PV input, dual MPPTs, and up to 100 A charge/discharge on the 6 kW variant), larger 8–12 kW systems for high-load households (up to 18 kW solar input, three MPPTs, and dual battery ports on flagship units), and a 12 kW three-phase option for large homes or light commercial use with the same high-input architecture.
The system supports both DC-coupled new installations and AC-coupled retrofits, and can also run standalone for tariff arbitrage—charging during low-price periods and discharging at peak rates. EPS backup is available for critical circuits.
On the software side, Eleven’s platform layers machine learning–based load forecasting, weather-aware generation prediction, and real-time tariff optimization over system control, continuously balancing self-consumption, export, and grid charging decisions, the company said. Setup is handled via a Bluetooth installer app in under five minutes, while end users benefit from autonomous operation with fine-grained control options.
The platform is fully certified for UK and EU grid standards, including G98/G99 and EN IEC compliance. Looking ahead, Eleven Energy is expanding into commercial-scale systems, with a planned 100 kWh sodium-ion platform and 50 kW inverter set for 2026, alongside ongoing R&D into sodium-specific BMS design, improved state-of-health modeling, and expanded AI-driven optimization delivered via over-the-air updates.
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