en.Wedoany.com Reported - Cambridge-based cleantech startup Eleven Energy unveiled its new residential sodium-ion storage solution at the Smarter E trade fair in Munich, Germany.
The company stated that it has deployed its systems in hundreds of homes through a network of over 100 certified partner installers. This marks one of the first large-scale residential sodium-ion applications in Europe.
"The opportunity for sodium-ion is strongest when storage is part of a complete energy system, not just battery chemistry," said Yichen Shi, CEO and co-founder of Eleven Energy, in an interview with pv magazine. "For residential and commercial storage, we designed everything around sodium—from the battery module to the inverter, software, and installation experience. Our goal is to make storage safer, more sustainable, and more practical for everyday solar and electricity price optimization."
The new product consists of an integrated stack, including a dedicated sodium-ion battery module, a hybrid inverter designed for sodium-ion voltage characteristics, and an AI-driven energy management platform aimed at optimizing self-consumption, electricity price arbitrage, and system lifespan. Eleven Energy stated that this reflects a shift in stationary storage design from chemistry-neutral "plug-and-play" batteries to tightly integrated, co-designed hardware-software systems.
At the core of the residential product is the Galvani battery module, a stackable unit designed specifically for stationary storage rather than high-energy-density transportation applications. Each module is based on a nominal 45 V architecture, offering 4.5 kWh of usable capacity with an operating voltage range of 33 V to 59.2 V. The system provides 100 A charge/discharge current per module, scalable to 200 A in multi-module configurations to handle larger residential loads or hybrid solar-plus-storage systems.
The system delivers 92% usable capacity in grid-connected operation, expandable to 95% in off-grid backup scenarios.
The IP65-rated modules are designed for both indoor and outdoor deployment, with a charging temperature range of -20°C to 55°C and discharge capability down to -30°C. The manufacturer stated that this significantly reduces the need for energy-intensive thermal management systems typically required for lithium-ion units in cold climates.
Eleven Energy offers a warranty of 10 years or 8,000 cycles for the system.
The company has also developed a dedicated inverter series tailored to sodium-ion voltage behavior and system dynamics. The series includes single-phase and three-phase units: 3.6–6 kW models for standard residential use (up to 9 kW PV input, dual MPPT, up to 100 A charge/discharge on the 6 kW variant), 8–12 kW systems for high-demand households (up to 18 kW solar input, triple MPPT, dual battery ports on the flagship unit), and a 12 kW three-phase option for large residential or light commercial applications.
The system supports DC-coupled new installations and AC-coupled retrofits, and can operate independently for electricity price arbitrage—charging during low-price periods and discharging during peak hours. EPS backup is provided for critical circuits.
On the software side, Eleven's platform integrates machine learning-based load forecasting, weather-aware generation prediction, and real-time electricity price optimization, continuously balancing self-consumption, grid feed-in, and grid charging decisions. Setup is completed within five minutes via a Bluetooth installation app, while end users benefit from autonomous operation and fine-grained control options.
The platform is fully certified for UK and EU grid standards, including G98/G99 and EN IEC compliance. Eleven Energy is expanding into commercial-scale systems, planning to launch a 100 kWh sodium-ion platform and a 50 kW inverter in 2026, while continuing R&D on dedicated sodium-ion BMS designs, improved state-of-health modeling, and AI-driven optimization expanded via over-the-air updates.
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