Fox ESS is the battery you'll see on more British roofs than any other — and that scale brings real advantages: mature firmware, a huge installed base of data, and parts and support that are never hard to find.
The EP-series packs use LiFePO₄ cells rated for 6,000+ cycles at ≥95% round-trip efficiency, available from 5.76 kWh up to a stacked 20.48 kWh. Whatever your home's appetite, there's a Fox configuration that fits.
Pair it with the EVO module for whole-home backup that engages in under 4 milliseconds, and manage everything from the FoxCloud app — including smart charging on cheap overnight tariffs.
Key Features
Best-Selling
The UK's number-one home battery brand.
6,000+ Cycles
LiFePO₄ longevity for daily cycling.
≥95% Efficient
Minimal loss storing and discharging.
EVO Backup
Whole-home backup in under 4 ms.
Stackable
Scale from 5.76 kWh up to 20.48 kWh.
FoxCloud App
Live monitoring and tariff scheduling.
What’s Included
- LiFePO₄ cells rated 6,000+ cycles
- ≥95% round-trip efficiency
- EP6 (5.76 kWh) to stacked 20.48 kWh
- Fox S-Series hybrid inverter
- EVO whole-home backup (<4 ms)
- FoxCloud app monitoring & control
- Heat-pump ready
- 10-year warranty
Specifications
- Cell type
- LiFePO₄
- Capacity
- 5.76 – 20.48 kWh
- Cycle life
- 6,000+ cycles
- Efficiency
- ≥95% round-trip
- Backup
- <4 ms (EVO)
- Warranty
- 10 years
Interested in the Fox ESS?
Get a free, no-obligation quote tailored to your home. We respond to every enquiry within 48 hours.