Fox ESS EP5 / EP11 review: price and specs for Scottish homes
Last updated: 30 October 2026 · Reviewed by the Scottish Energy Efficiency team
Is the Fox ESS EP5 / EP11 worth it in Scotland?
The Fox ESS EP5 and EP11 offer some of the lowest installed prices per kWh from a mainstream brand. The high-voltage LFP design is efficient and expands to 41.4kWh. The catch is that they work with Fox inverters only, so they fit best in new installs or homes that already have a Fox system.
Specifications
| Specification | Fox ESS EP5 / EP11 |
|---|---|
| Usable capacity per unit | 5.18kWh (EP5) or 10.36kWh (EP11) nominal |
| Maximum system size | 41.4kWh |
| Continuous power | Set by Fox inverter |
| Chemistry | LFP (high voltage) |
| Coupling | DC: DC with Fox ESS hybrid inverters |
| Warranty | 10 years, 70% capacity |
| Ingress rating | IP65 |
| Voltage | High voltage |
| Typical installed price (0% VAT) | £3,400–£6,000 |
Specifications from manufacturer datasheets; prices checked October 2026.
Pros and cons
Pros
- Low installed price per kWh
- Two sizes, EP5 and EP11, expandable to 41.4kWh
- Efficient high-voltage LFP cells
- IP65 rating for garage or sheltered outdoor installs
Cons
- Works with Fox ESS inverters only
- Warranty end capacity of 70%
- Power output depends on the Fox inverter chosen
Who does the Fox ESS EP5 / EP11 suit in Scotland?
They suit budget-conscious Scottish households fitting solar and a battery together, and homes already running a Fox hybrid inverter. The EP5 works for flats and smaller terraces, while the EP11 covers typical family evening use. Homes with another make of inverter would need a new inverter too, which raises the cost.
How much does the Fox ESS EP5 / EP11 cost installed?
Typical installed prices for the Fox ESS EP5 / EP11 in Scotland are £3,400–£6,000 at 0% VAT, checked October 2026. Expect quotes to vary by around 20–30% depending on your wiring, where the battery goes, whether solar is fitted at the same time and any backup equipment.
For a full Scottish cost breakdown, read our Fox ESS cost guide for Scotland.
Compare with
Fox ESS EP5 / EP11 FAQs
How much does a Fox ESS EP battery cost in Scotland?
Typical installed prices are £3,400–£6,000 at 0% VAT, checked October 2026, depending on size and whether a new inverter is needed.
Does Fox ESS work with my existing inverter?
The EP series needs a Fox ESS hybrid inverter. If you have another make, your installer will price a Fox inverter or suggest an alternative battery.
Can I add more Fox batteries later?
Yes, the EP series can be expanded up to 41.4kWh, subject to the inverter and installer checks.