PAS 63100 — fire safety when a home battery sits alongside your V2L backup
PAS 63100:2024 is the fire-safety specification for a fixed (stationary) home battery. It is the standard for any companion home battery that sits alongside a V2L backup — it governs where the battery may go, fire detection, stored-energy limits and impact protection near where the car parks. It does not cover the EV's own traction battery, and it explicitly excludes second-life batteries, including repurposed EV packs. The battery install is still designed and certified under BS 7671, with PAS 63100 layering fire safety on top.
In short
- PAS 63100:2024 is fire safety for fixed domestic battery storage — published 20 March 2024, the sole edition.
- It is for a companion home battery, not the EV's traction battery, and it excludes second-life / repurposed EV batteries.
- It favours outdoor or fire-separated locations and restricts higher-risk domestic locations — relevant near a garage where the car charges.
- Battery install follows BS 7671 (with the IET EESS Code of Practice); PAS 63100 adds the fire-safety layer and an installer statement of conformity.
- Numeric stored-energy limits and ratings are in the PAS — cite them by clause; we do not reproduce the figures.
Where this stops: This explains what PAS 63100 requires. The battery's selection, siting and certification are competent-person work — and a repurposed EV pack is outside this specification entirely.
What PAS 63100 is for
PAS 63100:2024 is a Publicly Available Specification (a fast-track BSI document, not a full British Standard) for the fire safety of small, fixed rechargeable-battery energy storage systems in dwellings. It reduces the chance a home battery becomes a source of ignition, and limits the consequences if one does. It is not a wiring standard — the electrical installation is still governed by BS 7671.
Where it fits with V2L
A V2L backup uses the car as the source. PAS 63100 governs a separate fixed home battery you might run alongside it — for example to store cheap overnight energy. The boundary matters: the EV's own traction battery is a moving vehicle battery, outside this PAS, and a repurposed EV pack used as fixed storage is explicitly excluded (Clause 1, NOTE 4) — that route falls back on a BS 7671 Reg 511.2 declaration with no settled standard.
Siting near the garage
Because PAS 63100 favours outdoor or fire-separated locations and adds impact protection near vehicle areas, where the car parks and charges directly affects where a companion battery may go. This is a competent-person siting decision against the PAS.
The clauses that matter
The reference card distils the clauses — scope and the second-life exclusion, the deferral to BS 7671 and the IET EESS Code, location rules, impact protection, the power-conversion-equipment standards, and the notices and conformity statement. The citation/edition is checked (public-primary); the clause substance is pending a licensed/source-text check. We cite them by number; the numeric stored-energy limits stay in the PAS.
How this is made and proven compliant
- PAS 63100:2024 (fire safety) layered on BS 7671 for the electrical installation
- BS EN 62109-2 for the power-conversion equipment (the hybrid inverter/charger)
- IET Code of Practice for Electrical Energy Storage Systems as application guidance
Design, installation and certification by a competent person to BS 7671, with the PAS 63100 fire-safety requirements and statement of conformity. Notifiable work under Part P (England; devolved nations differ).
- BS 7671 initial verification + certificate for the battery installation
- An installer PAS 63100 statement of conformity appended at initial verification
- Battery-present notices fitted at the required positions
Confidence: Inference rolled up across the clauses cited above (the strictest state wins).
Frequently asked questions
Does PAS 63100 apply to my EV's battery?
No. It covers fixed, stationary home batteries. The EV's traction battery is a vehicle battery outside its scope, and a repurposed EV pack used as fixed storage is explicitly excluded.
Can I reuse an old EV battery as home storage under PAS 63100?
Not under PAS 63100 — second-life batteries are excluded. That route has no settled domestic standard and falls back on a BS 7671 declaration; treat it with caution and competent-person design.
Does PAS 63100 replace BS 7671 for a home battery?
No. The battery is still designed, installed and certified to BS 7671 (with the IET EESS Code of Practice). PAS 63100 adds the fire-safety layer and a statement of conformity on top.
- Last reviewed
- 14 June 2026
- Written against
- BS 7671:2018 + A4:2026
- Reviewed by
- Martin (qualified UK electrician)
- Next review due
- 14 December 2026
General information, not project-specific design advice. Standards are cited by reference only and never reproduced. How we source this.
References & sources (2)
- PAS 63100:2024 — Protection against fire of battery energy storage systems for dwellings (BSI) — cited by clause only; numeric limits not reproduced
- V2L Workshop standards library — PAS 63100 reference card (internal)