Galvani Stackable Sodium-ion Battery System

Compact, modular home energy storage designed for faster installation and smarter everyday performance.

The Eleven Energy Galvani Stackable Battery System brings together sustainable sodium-ion technology, a clean home-friendly design and a simple modular architecture. Each 4.5 kWh battery module stacks neatly into place using integrated pin connectors, helping installers build a tidy, space-saving system without inter-battery cable connections or DIP switch configuration.

Expandable from a single module to up to 16 battery modules per inverter, Galvani delivers flexible capacity for homes with different energy needs — from everyday solar self-consumption to larger backup and tariff optimisation setups.

Key Features

Built for simple installation and flexible home energy storage

Galvani has been designed around the needs of installers and homeowners. The stackable architecture reduces installation complexity, while the slim vertical format keeps the system neat and space-efficient for indoor or outdoor home installations. Each stack uses a dedicated junction box with pre-installed power cables, helping simplify the connection between the battery system and compatible Eleven Energy hybrid inverters.

  • 4.5 kWh modular battery packs
    Each Galvani battery module provides 4.5 kWh of sodium-ion storage, making it easy to size the system around household energy use and future expansion needs.

  • Stackable, space-saving design
    Battery modules stack vertically to create a compact system footprint, making Galvani well suited to homes where floor and wall space are limited.

  • Up to 4 batteries per stack
    Build each battery stack with up to four modules, creating a clean and structured installation without spreading equipment across the property.

  • Expandable up to 16 modules per inverter
    Connect up to four stacks to a single inverter, allowing up to 16 battery modules and 66.24 kWh of usable capacity for larger home storage requirements.

  • Cable-free battery-to-battery stacking
    Battery modules connect using integrated pin-style stack connectors, removing the need for separate cable connections between battery packs and helping create a cleaner, faster installation.

  • No DIP switch setup required
    Galvani is designed to simplify commissioning, with no DIP switch configuration required between stacked battery modules.

  • Dedicated junction box for every stack
    Each stack uses a junction box to connect the battery system to the inverter, helping keep the installation organised and service-friendly.

  • Pre-installed inverter power cables
    The junction box includes a pre-installed inverter-battery power cable set.

  • High charge and discharge capability
    Galvani supports up to 100 A charge/discharge current for a single module and up to 200 A for multi-module systems, supporting strong performance for home energy storage applications.

  • Wide operating temperature range
    Designed for year-round reliability, the system supports charging from -20°C to 55°C and discharging from -30°C to 55°C.

  • Indoor or outdoor installation
    With IP65 protection and a wide humidity range of 5–95%, Galvani is suitable for flexible installation locations.

  • 10-year product warranty
    Galvani is backed by a 10-year, 8000-cycle product warranty, giving homeowners long-term confidence in their battery system.

Technical Specifications

Battery TypeSodium-ion
Capacity4.5 kWh
Max. Charging / Discharging CurrentSingle module: 100 A / 100 A; Multi-module: 200 A / 200 A
Rated Voltage45 V
Operating Voltage Range33V – 59.2V
Depth of Discharge92% on-grid / 95% off-grid
Charging Temperature-20°C – 55°C
Discharging Temperature-30°C – 55°C
IP GradeIP65
Humidity Range5 ~ 95%
Dimensions (W x H x D)Battery Module: 640 x 350 x 250 mm; Junction Box: 640 x 220 x 250 mm; Base: 640 x 95 x 250 mm
WeightBattery Module: 59 kg; Junction Box: 11.5 kg; Base: 6 kg
InterfaceRS485 / CAN
StandardEN IEC 61000-6, EN IEC 62619
Product Warranty10 Years

Document Downloads

Official Distributor

Midsummer Energy is our UK distributor and strategic partner in bringing our sodium battery systems to market.

Midsummer Energy

Website: https://midsummerwholesale.co.uk/
Phone: +44 (0)1223 851 535
Address: Midsummer,Cambridge Road Industrial Estate,Milton CB24 6AZ

Client Testimonials

Trusted by Installers. Loved by Homeowners. Hear from our satisfied customers.

“We couldn’t be happier with the Eleven Energy inverter and battery system and the support the company has provided”

Read more

Adam R.
6 kW North Sea Inverter + 18 kWh Volta Sodium-ion Battery

“I can highly recommend the Eleven sodium battery for its performance and reliability”

Read more

Simon B.
3.6 kW Inverter + 4.5 kWh Volta Sodium-ion Battery

“The products are very smart, easy to install, and probably the simplest on the market to commission”

Read more

Mike H.
6kW Inverter + 9 kWh Volta Sodium-ion Battery

“From an installer’s point of view, it’s clear that usability and reliability were top priorities in the system design”

Read more

Adrian B.
6 kW Inverter + 13.5 kWh Volta Sodium-ion Battery

“We’re new to solar so have appreciated having such a responsive team at Eleven Energy whenever we’ve had questions. We’d not hesitate to recommend them!”

Read more

Kathleen W.
6 kW Inverter + 9 kWh Volta Sodium-ion Battery