In 2025, with energy prices still volatile and the UK's push towards net-zero accelerating, homeowners are increasingly investing in home battery storage to complement solar PV systems. These solutions allow you to store excess solar energy generated during the day for use in the evenings, during peak tariffs, or even outages – maximising self-consumption and slashing bills. Amid rising concerns over lithium-ion supply chains and environmental impacts, sodium-ion battery technology is emerging as a game-changer: more sustainable, safer, and perfectly suited to British homes.
Leading the charge in this innovative space is Eleven Energy, a UK-based company dedicated to creating eco-friendly, reliable, and affordable energy storage. Named after sodium's atomic number (11), Eleven Energy was founded by experts in renewable energy, software engineering, and power electronics. Their mission? To accelerate the adoption of clean energy storage while prioritising sustainability, innovation, and reliability.
Eleven Energy's Cause: A Greener Alternative to Lithium-Ion
At the heart of Eleven Energy's ethos is a commitment to reducing the environmental footprint of energy storage. Traditional lithium-ion batteries rely on scarce resources like lithium and cobalt, often involving intensive mining that consumes vast amounts of water (over 1.9 million litres per tonne of lithium), threatens biodiversity, and impacts local communities.
In contrast, sodium-ion batteries from Eleven Energy use abundant, non-toxic materials:
- Sodium is sustainably extracted from seawater and is over 1,400 times more abundant than lithium.
- Cathodes are crafted from industrial by-products like iron oxide and manganese oxide, minimising waste.
- Anodes draw from everyday materials such as cardboard, straw, or coal.
This approach avoids unethical sourcing, drastically cuts water usage, and ensures components are fully recyclable. The result? A significantly lower carbon footprint and a more ethical choice for conscious homeowners.
Moreover, sodium-ion technology delivers superior performance in extreme temperatures (-20°C to 55°C), far outperforming lithium-ion batteries that often falter below 0°C or above 40°C – ideal for the UK's variable climate.
Key Benefits of Eleven Energy's Sodium-Ion Systems
Eleven Energy's products stand out for their blend of sustainability and practicality:
- High Efficiency: Up to 95% round-trip efficiency and deep discharge (92-95% depth of discharge).
- Safety First: Stable chemistry eliminates risks of thermal runaway or fire.
- Longevity: Robust design backed by a 10-year warranty.
- Expandability: Start small and scale up to over 33 kWh with multiple battery packs.
- Intelligent Management: Advanced platform integrates solar forecasting, smart tariff optimisation (e.g., Agile Octopus), EV charger control, heat pump compatibility, and seamless Home Assistant support – all with secure, UK-hosted data.
These features not only boost energy independence but also deliver real savings by shifting usage away from expensive grid power.
Explore the Eleven Energy Product Range
Eleven Energy offers hybrid inverters and modular battery packs, compatible with new or existing solar setups.
Hybrid Inverters (North Sea Series – Single Phase):
- 6kW Model: Handles up to 9kW solar input with 98% efficiency and ultra-fast 10ms grid switchover. Shop now
- 5kW Model: Versatile for medium systems. Shop now
- 3.6kW Model: Perfect for smaller or entry-level installations. Shop now
Battery and Accessories:
- Expandable 4.5kWh sodium-ion packs for flexible capacity. Shop now
- IP65 Outdoor Enclosure (for two batteries): Weatherproof protection for garage or external mounting. Shop now
- Parallel cables for easy expansion: Battery-Battery Parallel Cable SetBattery Enclosure Parallel Cable Set
All products are fully certified (G99/G100 compliant) and designed for straightforward professional installation.
See Eleven Energy Systems in Action
To better understand the installation process, here are some insightful videos showcasing real-world setups and reviews:
Official Installation Guide – Step-by-step from Eleven Energy:
Real User Installation and Review – Joe swaps to a sodium-ion system:
Expert Discussion – Could sodium-ion become more popular than lithium?
These videos highlight the ease of setup, performance in UK homes, and growing enthusiasm for this technology.
Why Sodium-Ion is the Future for UK Home Storage in 2025
With sodium-ion batteries gaining traction globally – and experts predicting rapid growth in affordable, sustainable storage – Eleven Energy positions UK homeowners at the forefront. Whether retrofitting an existing solar array or planning a new system, these solutions offer long-term reliability, environmental responsibility, and tangible financial benefits.
Browse the full Eleven Energy collection at Quality Heating today and consult our experts for personalised advice. Make 2025 the year you take control of your energy future – sustainably and affordably.