Guide · Batteries
Fox ESS battery review: the EP12 and EP6, from the installers who fit them
Checked by our MCS-certified installers · Updated October 2026
Short answer
The Fox ESS EP12 is the battery we fit more than any other: a proven system at a fair price, and easy to add to later.
The smaller EP6 suits a 1–2 bed home. Both come with a 10-year Fox ESS warranty. Read our full EP12 review.
5.0 on Google
MCS-certified installer · Cert. no. NAP/79987/26/1
The two Fox batteries we fit
| EP6 | EP12 | |
|---|---|---|
| Stores | 5.76 kWh | 11.52 kWh |
| Best for | An evening's use, 1–2 bed home | A full evening and night, family home |
| Add more later | A second EP6 | Up to 23 or 34.5 kWh |
| Warranty | 10 years | 10 years |
Torn between the two? Fox ESS EP6 vs EP12 goes into the detail. Already have solar? We add batteries to systems other firms fitted.
Quick answers
EP6 or EP12 — which should I get?
EP6 if you mostly need the evening covered in a smaller home. EP12 for a family home that uses power late into the night.
Can you add a Fox battery to my existing solar?
Yes — including systems another firm fitted. Battery only from £1,990.
Get started
Which Fox battery suits your home?
Your free design and fixed price, with the battery sized to how you use power — usually within 24 hours.
0% VAT on solar & battery until March 2027