The Eleven Galvani ELB-4.5-02 is a 4.5kWh stackable sodium-ion battery designed for homes that want flexible battery storage with room to expand over time. Installed from £2025, it is built to work with Eleven hybrid inverters and gives you a modular way to add energy storage without committing to an oversized system from the start.
This is the better option for customers who want a battery system that can grow with the property. A single 4.5kWh module can form the starting point, while additional modules can be added to increase storage capacity as energy use changes.
The Galvani system is designed around stackable battery modules, using a base and junction box to create a neat vertical installation. Each module provides 4.5kWh of capacity, and the system can be expanded up to 16 battery modules, giving up to 66.24kWh of usable capacity.
The Galvani ELB-4.5-02 uses sodium-ion battery technology, giving customers an alternative to lithium-based storage. It is positioned as a more sustainable battery choice while still offering the performance expected from a modern home storage system.
Rated voltage is 45V, with an operating voltage range of 33V to 59.2V. Maximum charging and discharging current is up to 100A for a single module and up to 200A in multi-module setups.
One of the stronger selling points of the stackable Galvani battery is its IP65 rating, which makes it suitable for indoor or outdoor installation when correctly installed. The datasheet also gives a wide charging temperature range of -20°C to 55°C and a discharging temperature range of -30°C to 55°C, making it a practical fit for a range of installation locations.
This battery is designed to work with Eleven Energy hybrid inverters and should not be connected to other inverter brands. The installation manual also makes clear that battery packs must not be connected in series, and that an earth bond must be installed between the battery and inverter.
For a product page, the main point is simple: this is not a general-purpose battery pack. It is part of Eleven’s own integrated inverter and battery platform.
The Eleven 4.5kWh Stackable Battery is a strong fit for households that want:
If you want a battery system that can start at 4.5kWh and scale up as your storage needs grow, the Galvani stackable setup is the stronger option.
| Specification | Details |
|---|---|
| Model | Eleven Galvani ELB-4.5-02 |
| Battery Type | Sodium-ion |
| Capacity | 4.5kWh per module |
| Max Charge / Discharge Current | 100A / 100A single module, 200A / 200A multi-module |
| Rated Voltage | 45V |
| Operating Voltage Range | 33V – 59.2V |
| Depth of Discharge | 92% on-grid / 95% off-grid |
| Charging Temperature | -20°C to 55°C |
| Discharging Temperature | -30°C to 55°C |
| IP Rating | IP65 |
| Humidity Range | 5% – 95% |
| Battery Module Dimensions | 640 x 350 x 250mm |
| Junction Box Dimensions | 640 x 220 x 250mm |
| Base Dimensions | 640 x 80 x 250mm |
| Battery Module Weight | 59kg |
| Junction Box Weight | 11.5kg |
| Base Weight | 6kg |
| Interface | RS485 / CAN |
| Expandability | Up to 16 battery modules, 66.24kWh usable capacity |
| Warranty | 10 years |
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