Guide · Batteries
What size battery do I need?
Checked by our MCS-certified installers · Updated October 2026
Short answer
For most homes, between 5.76 kWh and 11.52 kWh.
A 1–2 bed home usually needs the Fox ESS EP6 — 5.76 kWh, from £1,990 fully installed. A family home needs the EP12 — 11.52 kWh, from £2,790.
Find your size in 3 taps
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MCS-certified installer · Cert. no. NAP/79987/26/1
Still deciding between the two Fox sizes? Fox ESS EP6 vs EP12 goes into the detail, and where a home battery can go covers the other question we're asked at every survey.
Quick answers
Can I start small and add more later?
Yes. Add a second EP6 later, or stack the EP12 up to 23 or 34.5 kWh.
Get started
Get the size right first time.
A free survey confirms the battery for your home, with a fixed price — usually within 24 hours.
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