Eleven Energy
Eleven Energy designs and integrates sodium-ion battery storage with hybrid inverters and AI energy management for UK residential and small commercial customers, sold exclusively through installers via Midsummer Energy and integrated with Octopus Energy smart tariffs.
- Company typePrivate
- Founded2022
- HeadquartersCambridge, United Kingdom
- Headcount1–10
- GTM typeB2B
- OfferingHardware or Manufacturing
What Eleven Energy does
Eleven Energy is a Cambridge, UK-based clean technology company founded in 2022 that designs and integrates sodium-ion battery energy storage systems for UK residential and small commercial customers. The platform pairs the Galvani stackable 4.5 kWh sodium-ion battery module with three matched hybrid inverter ranges — North Sea (3.6-6 kW single-phase), Mediterranean Sea (8-12 kW single-phase), and Celtic Sea (12 kW three-phase) — and a cloud-based AI energy management system that integrates with Octopus Energy smart tariffs as well as Home Assistant and Shelly ecosystems. Each Galvani module is independently ENA type-tested under G98, G99, G100 and certified to IEC 62109, EN IEC 62619, UN 38.3, and PAS 63100:2024.
The company sells through a trained installer network on a quote-based model with no public pricing; revenue is generated from hardware sales of battery packs and inverters, with energy management software bundled as an integrated feature. Its exclusive UK distribution partner is Midsummer Energy, whose founder Andy Rankin also serves as Eleven Energy's Chief Growth Officer, creating a vertically aligned channel. Notable deployments include the UK's first off-grid sodium-ion installation (a 13.5 kWh system for Icore Security) and residential installations scaling into the tens of kilowatt-hours.
The company was founded by Yichen Shi (CEO) and Neil French (CTO) with scientific advisory from Professor Teng Long of Cambridge, and was featured by pv magazine Global. It is exploring international expansion beyond the UK but has not disclosed funding, revenue, or headcount data publicly.
Eleven Energy firmographics
Firmographics- Name
- Eleven Energy
- Legal name
- Eleven Energy Ltd
- Website
- https://elevenenergy.co.uk
- Company type
- Private
- Founded year
- 2022
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Eleven Energy designs and integrates sodium-ion battery storage with hybrid inverters and AI energy management for UK residential and small commercial customers, sold exclusively through installers via Midsummer Energy and integrated with Octopus Energy smart tariffs.
- Ownership category
- akta.pro rank
Eleven Energy industry classification
Industry- Product category
- Home Battery Energy Storage
- NAICS
- Battery Manufacturing (33591), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)
- SIC
- Electronic & Other Electrical Equipment (No Computer Equip) (3600)
- akta.pro primary industry
- Home Energy & EV Charging (HEMS, Smart Meters, Batteries, Chargers) (HSAPAQAF)
- akta.pro secondary industries
- Battery Modules & Packs (Industrial/Commercial pack assembly) (IMAGAHAB), Energy Storage Software & Controls (EMS, monitoring, optimization, cybersecurity) (IMAGAHAJ), Residential / Behind-the-Meter Storage Installation & Integration (EUAEAEAC)
Keywords
Where Eleven Energy is headquartered
LocationHeadquarters
- HQ city
- Cambridge
- HQ country
- United Kingdom
- HQ region
- Europe
Offices3 records
Markets served
Eleven Energy business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Technology or R&D, Personnel, Marketing or Sales, Operations, Infrastructure
Revenue model
- Sodium-ion Battery Modules: Sale of Galvani stackable sodium-ion battery packs (4.5 kWh modules) and Volta battery products. Batteries are sold exclusively through Midsummer Energy distributor and trained installer partners.
- Hybrid Inverters: Sale of North Sea, Mediterranean Sea, and Celtic Sea hybrid inverters ranging from 3.6kW to 12kW. Inverters are sold through Midsummer Energy with ENA type-testing certification for UK grid connection.
- Energy Management Software: Cloud-based energy management platform included with hardware purchases. Provides tariff optimization, energy monitoring, and smart scheduling capabilities integrated with Octopus Energy smart tariffs.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | No public pricing - quote-based through installers |
Go-to-market motion3 records
Distribution channels3 records
Marketing channels6 records
Eleven Energy product offering
Product offeringCore offering
Eleven Energy designs, manufactures and sells an integrated sodium-ion home and small-commercial energy storage platform consisting of stackable 4.5 kWh Galvani battery modules, a family of purpose-built hybrid inverters (North Sea, Mediterranean Sea, Celtic Sea), and AI-driven cloud-connected energy management software with mobile app commissioning. Products are sold exclusively through UK distributor Midsummer Energy and a certified installer network rather than directly to consumers.
Product overview
Eleven Energy offers an integrated home energy storage platform combining sodium-ion battery modules with hybrid inverters and AI-driven energy management software. The product portfolio includes the Galvani Stackable Sodium-ion Battery (4.5 kWh modular packs), the North Sea inverter range (3.6-6 kW single-phase), Mediterranean Sea inverter range (8-12 kW single-phase), and Celtic Sea inverter (12 kW three-phase). These components work together as a matched system, with batteries and inverters designed specifically for sodium-ion chemistry. The system is managed through a mobile app and web portal with tariff-aware optimization, smart scheduling, and integration with Home Assistant and Shelly devices.
Differentiator
Problem solved
Functional benefit
Products and services
- Galvani Stackable Sodium-ion Battery Modular 4.5 kWh sodium-ion battery packs with stackable, space-saving design using cable-free pin connectors. Expandable up to 16 modules per inverter (66.24 kWh), IP65 rated, operates from -30°C to 55°C, with 10-year warranty and 8,000-cycle guarantee. Designed for UK residential and small commercial energy storage when paired with Eleven Energy hybrid inverters.
- North Sea Single-phase Hybrid Inverters 3.6 kW, 5 kW, and 6 kW single-phase hybrid inverters purpose-built for sodium-ion battery systems. Features IP65 rating, AC-coupled retrofit support, emergency power supply (EPS) backup capability, natural cooling, MPPT voltage range 80-550V, max efficiency up to 98.0%, and compliance with UK grid standards G98, G99, G100.
- Mediterranean Sea Single-phase Hybrid Inverters 8 kW, 10 kW, and 12 kW single-phase hybrid inverters with dual independent battery inputs, triple MPPT solar design (3x20A), generator charging support, IP65 rating, peak power 20kVA for 10s, and SiC technology achieving up to 98.2% efficiency. Designed for larger residential and small commercial installations using sodium-ion batteries.
- Celtic Sea Three-phase Hybrid Inverter 12 kW three-phase hybrid inverter with dual battery inputs and triple MPPT design. Supports parallel operation up to 48kW (4 units), unbalanced three-phase load output up to 4kW per phase, IP65 rating, SiC technology with 98.2% max efficiency, and generator charging support. Targeted at larger homes and commercial properties using sodium-ion batteries.
Quantifiable outcome
- Cells tested to over 13,000 cycles with 85% capacity remaining
- +5 more outcomes
Companies that use Eleven Energy
Customer profileNamed customers14 records
Segments4 records
Ideal customer profiles3 records
Eleven Energy technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration2 records
AI capability3 records
Feature8 records
Eleven Energy partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered core, support and minor.
- Octopus EnergycoreOfficial Smart Tech Partner enabling direct integration between Eleven's sodium-ion home battery system and Octopus smart tariffs. Allows automatic optimization of battery charging and export based on real-time Octopus pricing including Agile, Intelligent Go, and Flux tariffs. Homeowners benefit from lower energy costs with clear visibility of energy usage and performance through smart monitoring.
- Midsummer EnergycoreExclusive UK distributor and strategic partner. Provides nationwide warehousing, distribution network, and sales/marketing support across their installer network. Twice voted UK's Best Renewables Distributor. Supports product design, testing, and technical feedback. Access to thousands of solar and storage installers via Easy PV software platforms.
- ShellysupportNative device integration for power monitors and smart switches. Enables energy device monitoring to detect EV charging loads, immersion heater control, and wind turbine exports. Shelly CT sensors required for AC coupling with existing solar systems.
- Home AssistantsupportIntegration with Home Assistant for advanced smart home energy automation. Currently uses Eleven cloud API for monitoring and switching work modes. Does not currently offer fully local-only Home Assistant integration.
- Icore Security LtdminorSecurity systems integrator that installed and commissioned the UK's first off-grid sodium-ion battery system with Eleven Energy. 6kW hybrid inverter with 3x4.5kWh batteries powering independent off-grid site.
- Joju SolarcoreNational solar installation company and installer partner for Eleven Energy sodium battery systems. Featured in installer network building announcements.
- Naked Solar: B-CorpsupportRegional B-Corp certified solar installer partner for Eleven Energy systems.
- Natural Generation LtdsupportRegional solar installer partner for Eleven Energy systems.
- SparteksupportRegional installer partner for Eleven Energy systems.
Scale indicators5 records
Recent moves6 records
Expansion highlights6 records
Eleven Energy competitors and assessment
Company assessmentBroad incumbents
- SolarEdge: Solar inverter and home energy company with integrated battery storage and energy management offerings. Broad incumbent in residential solar-plus-storage with established UK installer relationships.
- Sonnen: European residential and small commercial battery storage specialist (now owned by Shell) offering integrated energy management. Comparable target segment and complete-system approach, with broader geographic presence and oil-major backing.
- Enphase Energy: Microinverter and home battery (IQ Battery) company with strong installer channel and home energy management software. Comparable end-to-end residential solar-plus-storage proposition with broader product portfolio.
- Tesla Energy: Powerwall is the dominant residential battery storage product globally with deep installer networks and brand recognition. Broad incumbent addressing the same UK residential storage market Eleven Energy targets.
Direct peers
- Powervault: UK residential battery storage manufacturer and installer targeting solar PV homes. Direct competitor in UK residential channel with similar hardware-plus-software proposition through UK installers.
- Pylontech: Major lithium-ion residential and commercial battery storage supplier with strong UK installer presence. Closest product peer to Eleven Energy's modular battery approach though using lithium chemistry rather than sodium-ion.
- Moixa: UK-based residential battery storage company offering smart home battery systems with AI-driven energy management software. Closest direct peer to Eleven Energy with similar UK focus, installer channel, and grid services integration.
- Growatt: Global inverter and battery storage manufacturer offering integrated hybrid inverter plus battery systems for residential use. Similar product bundling strategy and installer-channel model across UK and European markets.
Emerging players
- Altris: Swedish sodium-ion battery cell developer targeting stationary storage applications. Technology peer with shared sodium-ion chemistry focus, though operating at the cell level rather than integrated residential system level.
- Faradion: UK-based sodium-ion battery technology company (acquired by Reliance New Energy Solar) developing cells for mobility and stationary storage. Direct technology peer to Eleven Energy's sodium-ion focus, though focused on cell supply rather than integrated residential systems.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks7 records
Key highlights7 records
Customer concentration
Eleven Energy social profiles
Digital presenceEleven Energy compliance and trust
Trust signalCompliance18 records
Eleven Energy financial estimates
Financial estimateRevenue estimate
Valuation estimate
Eleven Energy leadership team
Management profileNumber of profiles
Profiles7 records
Eleven Energy funding detail
Funding detailFunding overview
Funding rounds1 record
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Eleven Energy M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Eleven Energy
What does Eleven Energy do?
Eleven Energy designs, manufactures and sells an integrated sodium-ion home and small-commercial energy storage platform consisting of stackable 4.5 kWh Galvani battery modules, a family of purpose-built hybrid inverters (North Sea, Mediterranean Sea, Celtic Sea), and AI-driven cloud-connected energy management software with mobile app commissioning. Products are sold exclusively through UK distributor Midsummer Energy and a certified installer network rather than directly to consumers.
Is Eleven Energy a public or private company?
Eleven Energy is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Eleven Energy founded?
Eleven Energy was founded in 2022. It employs 1 to 10 people.
Where is Eleven Energy based?
Eleven Energy is headquartered in Cambridge, United Kingdom, in the Europe region.
How does Eleven Energy make money?
Three revenue lines are on record. Sodium-ion Battery Modules are the primary driver. The others are hybrid Inverters and energy Management Software.
Who are Eleven Energy's main competitors?
Broad incumbents on record are SolarEdge, Sonnen, Enphase Energy and Tesla Energy. Direct peers are Powervault, Pylontech, Moixa and Growatt. Emerging players are Altris and Faradion.
Does Eleven Energy have an API?
Yes. Eleven Energy offers a cloud API that powers Home Assistant integration for monitoring and controlling work modes. The API is used for smart home energy automation through Home Assistant. Additionally, a web portal is available at portal.elevenenergy.co.uk for monitoring and controlling the battery system.
What industry is Eleven Energy in?
Eleven Energy's product category is Home Battery Energy Storage. Its primary akta.pro industry code is HSAPAQAF, Home Energy & EV Charging (HEMS, Smart Meters, Batteries, Chargers), with a secondary code of IMAGAHAB, Battery Modules & Packs (Industrial/Commercial pack assembly). Its NAICS code is 33591 and its SIC code is 3600.