Global Market Rank
A dominant force in the UK and European domestic markets, holding a significant market share in residential storage.
Battery storage
Fox ESS battery storage.
Slim, stackable LiFePO₄ batteries from 5kWh upwards with a 12-year product warranty, backed by a Fortune Global 500 group.
- 5–30kWh+capacities available
- 12yrproduct warranty
- 10GW+deployed globally
- 100+countries
Brand profile
Brand history & corporate profile.
Founded in 2019, Fox ESS is a dynamic global leader in solar and battery storage solutions, backed by the Tsingshan Group, a Fortune Global 500 company and the world’s largest producer of stainless steel and nickel. By choosing Fox ESS, you are investing in a heavily resourced, rapidly expanding tier-1 brand that combines cutting-edge aesthetics with powerful performance, high-end supply chain integration, and extended warranty security.
Key data
Key data & performance metrics.
Production Scale
Deeply integrated supply chain through Tsingshan Group, ensuring massive battery cell production scale and availability.
Corporate Backing
Backed by Tsingshan Group (Fortune 500), guaranteeing financial longevity, immense R&D budgets, and supply-chain immunity.
High Efficiency & Yield
Advanced hybrid inverters paired with high-voltage battery systems to ensure rapid charge/discharge rates and low conversion losses.
UK Field Leadership
Headquartered operations in the UK with a massive network of certified installers, offering rapid-response local technical support.
Recognition
Independent recognition.
| Recognition body | Rating / award | What it means for your project |
|---|---|---|
| BloombergNEF (BNEF) | Tier 1 Inverter Manufacturer | Recognised by major international banks for corporate stability and operational excellence. |
| EUPD Research | Top Brand PV Storage | Voted a top domestic storage brand by UK installers and end-users for ease of use and reliability. |
| Trustpilot | 4.7 / 5 Excellent Rating | Highly rated by UK homeowners for post-installation support, app experience, and product reliability. |
| TÜV Rheinland | Safety & Performance Certified | Independently verified to meet the strictest global safety and operational standards. |
A brand you can trust
Built for long-term performance.
Safety First
Uses the safest Lithium Iron Phosphate (LiFePO₄) chemistry, built with heavy-duty thermal management and internal safety protections.
Smart Energy Management
Fully integrated FoxCloud app allows for seamless monitoring, force-charging from the grid, and automated tariff maximisation.
Scalable Design
Expand battery capacity easily with stackable floor-mounted cubes or scalable wall-mounted EP series batteries.
Reliable Backup Power
Keep essential circuits running during grid outages when installed with backup functionality.
Backup power needs additional infrastructure to be installed. Please ask us for prices.
Our recommendation
Why Synergy Power recommends Fox ESS
Why we recommend it
- Outstanding value for money in the UK market
- Supported by a massive Fortune Global 500 supply chain
- Sleek, modern aesthetics that suit residential properties
- Comprehensive 12-year standard battery warranty
- User-friendly app optimised for UK time-of-use tariffs
Available capacities
- 5kWh (EP5 / ECS)
- 10kWh (EP11 / ECS)
- 15kWh / 20kWh / 30kWh+ (Energy Cube / AIO)
Ideal for
- Solar PV owners wanting a sleek design
- Time-of-use tariffs
- Limited indoor/outdoor installation spaces
- Future-proof system expansion
Product range
Fox ESS Residential Battery Range (UK 2026)
| Model | Usable capacity | Type | Typical application | Key features |
|---|---|---|---|---|
| Fox EP5 / EP11 | 5.18kWh / 10.36kWh | Slimline Lithium-iron phosphate (LFP) | Small to medium domestic | Ultra-slim wall-mount design (147mm depth), built-in heater. |
| Fox Energy Cube | 2.88kWh per module (scalable) | Modular LFP | Medium domestic systems | Floor-stackable, easy installation, wide temperature tolerance. |
| Fox AIO (All-In-One) | 10.4kWh base (scalable) | Integrated hybrid inverter + battery | Premium domestic installations | Single outdoor-rated (IP65) column, seamless aesthetics, plug-and-play. |
Photos
Fox ESS in detail.
Fox ESS all-in-one battery
Fox ESS EP series battery
Fox ESS Energy Cube
Battery quote
Is Fox ESS right for your home?
Tell us about your home, your solar and how you use electricity, and we will recommend the right battery and capacity for you.
- Estimated system size
- Estimated bill savings
- Carbon reduction estimate
- Indicative payback