Cited sources
Last verified 2026-09-25.
- Eleven Energy describes Galvani as a stackable home battery built on sodium-ion chemistry, with each module based on a 4.5 kWh sodium pack.
- The maker says it supplies systems in the UK through its distributor, Midsummer Energy, and through trained installers; no price is shown on the product page.
- It cannot be scored yet: the datasheet gives no round-trip efficiency and no continuous power rating in kW, and it lists EN IEC 62619 and EN IEC 61000-6 without any certificate listing.
- The maker states a 10 year, 8000 cycle warranty, but the throughput limits sit in a separate warranty document that these sources do not include.
- The 66.24 kWh figure is the usable capacity of a full 16 module stack, not the rating of one module, and this record is not joined to any scored or evidence record.
- Legal manufacturer as printed: Eleven Energy Ltd.
- Eleven Energy, Galvani sodium battery datasheet, Version 1.0, Dec 2025https://www.elevenenergy.co.uk/wp-content/uploads/2026/05/Galvani-Sodium-Battery-Datasheet-V1.0.pdf
Prints the product name Galvani and code ELB-4.5-02, sodium-ion battery type, 4.5 kWh capacity, EN IEC 61000-6 and EN IEC 62619 standards, a 10 year product warranty and 66.24 kWh usable capacity for up to 16 modules.
- Eleven Energy, Galvani Stackable Sodium-ion Battery product pagehttps://www.elevenenergy.co.uk/products/galvani-sodium-ion-battery/
Describes the Galvani stackable sodium-ion battery system, states a 10 year, 8000 cycle product warranty, names Midsummer Energy as UK distributor and prints the legal entity Eleven Energy Ltd, with no price shown.
- Eleven Energy, Frequently Asked Questionshttps://www.elevenenergy.co.uk/frequently-asked-questions/
States that modules are based on 4.5 kWh sodium packs, that systems are supplied through UK distributor Midsummer Energy and trained installers, and that warranty cover is subject to throughput limits in a separate warranty document.