Can my EV power my home in the UK?
Yes — partly. If your EV has V2L (vehicle-to-load), it can run a *small essential load* — lights and a socket or two, typically up to about 3.6 kW. It cannot run your whole house: a domestic consumer unit is rated around 63 A, while a V2L output is only about 10–15 A. You also cannot use V2L while the car is charging. And you cannot do it safely by plugging the car into a wall socket — wiring an EV's output into your home's fixed wiring is notifiable work that must be designed, installed and tested by a competent person to BS 7671. The hard parts are the changeover (how you switch between grid and car) and the earthing of a floating V2L output, which is a contested design and the vehicle maker does not sanction this use.
In short
- Yes — an EV with V2L can power a small essential load (lights + a socket or two), typically up to ~3.6 kW (≈10–15 A) at 230 V.
- No — not the whole house. A consumer unit is around 63 A; a V2L output is around 10–15 A. Whole-house onto V2L is a gross overload.
- Not by plugging into a socket. Feeding your home's fixed wiring from the car is notifiable competent-person work, not a plug-in accessory.
- You cannot use V2L while the car is charging — a scheduled scheme charges cheap overnight and runs the board off the car at peak.
- The hard parts are the changeover and earthing a floating V2L output — designed and proven by test by a competent person; the car maker does not sanction this use.
Where this stops: This page explains what is realistic and what the work involves. It is not a wiring recipe — designing, installing and testing the connection to your home is for a competent person.
Some details below depend on sources still being verified against the published standard, so we mark them Not confirmed rather than guess:
- What (if anything) A4:2026 changed for §722 / V2X / V2H / V2L / PME / open-PEN — IET's published change-lists do not name these. The existing PME/open-PEN framework appears to carry forward, but no A4-specific V2X/PME change is asserted here until confirmed against the published standard. (safety-critical — not treated as settled until verified)
- The exact V2L output rating of any specific vehicle — figures vary by model, trim, market and firmware. The ~3.6 kW / ≈10–15 A figures here are typical European values; confirm against current manufacturer documentation for your car.
- Whether a given installation needs DNO notification — a true islanded (break-before-make) changeover is generally outside ENA G98/G99, but whether a changeover genuinely prevents parallel operation is a design-and-test matter for the competent person and the DNO.
The short answer
Yes, *to a point*. If your EV has V2L (vehicle-to-load), it can act like a quiet, emission-free generator and run a small essential load — think lights, the router, a fridge and a socket or two — typically up to about 3.6 kW (≈10–15 A) at 230 V. What it cannot do is run your whole house, and it cannot do it by you plugging the car into a wall socket. Wiring an EV's output into your home's fixed wiring is notifiable electrical work for a competent person.
What 'a small essential load' means
Lighting plus one radial socket circuit — enough to keep a fridge, broadband, phones and a few lights going. Not the cooker, not the shower, not an immersion heater, not a whole consumer unit.
Why not the whole house?
It is a question of size. A typical domestic consumer unit (fuse board) is rated around 63 A. An EV's V2L output is only around 10–15 A. Putting the whole house onto the car is a gross overload — four to six times what the source can deliver. The realistic job is a small *essential* board sized to the car, not the house sized down to the car.
Whole-house onto V2L is a gross overload
Roughly a 63 A board versus a 10–15 A source. You design for a small essential circuit and keep the actual draw within about 80% of the V2L rating — never try to back-feed the whole fuse board.
Why you can't just plug the car into a socket
Two reasons. First, back-feeding — pushing power *into* a socket to energise your home wiring — is dangerous and the vehicle manufacturer does not sanction it; it can make other outlets and the supply tails live in ways no one expects. Second, doing it safely needs a proper changeover (so the car and the grid can never be connected together) and a correct earth reference for the car's output. Those are fixed-wiring jobs, which brings in the law.
Adding a new circuit, a changeover/transfer switch, or altering the consumer unit to feed power from your EV is notifiable work in England. It must be designed, installed, tested and certified by a competent person — Wales, Scotland and Northern Ireland have their own equivalent rules.
Reference only — verify against the current edition; standard text is not reproduced.
You can't use V2L while the car is charging
The V2L output is not available while the vehicle is charging — it is one or the other. That shapes how people actually use it for cost: charge the car cheaply overnight, then run the essential board off the car during expensive peak hours, returning to the grid before the next charge. That is load-shifting, and it needs a scheduled, commanded changeover rather than a simple plug.
The two hard parts (and where it stops being DIY)
If you take one thing away, take this: the kit on the car is the easy bit. The engineering is in how you switch and how you earth.
- The changeover. Grid and car must never be connected together. The correct method is an interlocked, break-before-make changeover (and, for a schedule, a timed relay commanding it) — *not* a cheap voltage-sensing transfer switch, which senses power loss and has no way to switch on command.
- The earthing. Some V2L outputs are floating — they have no neutral-earth reference, so an RCD has nothing to operate against. The output can pass a plug-in socket tester and still give no shock protection. Giving it a single, correct earth reference on a PME (TN-C-S) home supply is the genuinely contested part of the design.
On the common PME (TN-C-S) home supply you cannot simply borrow the grid's earth for the car side — a broken combined neutral-earth conductor upstream could raise metalwork to a dangerous voltage. This is why feeding a floating V2L output into a PME-earthed home is contested and must be designed and proven by test by a competent person.
Reference only — verify against the current edition; standard text is not reproduced.
What the diagram shows: The diagram shows two sources feeding an essential board through a changeover. From the grid, line (L) and neutral (N) arrive at the changeover; the circuit protective conductor (E/CPC) runs continuously to the board and earth bar and is never switched. From the V2L source, L and N arrive at the other side of the changeover. A neutral-earth (N–E) bond is made only when the board is on V2L, providing the floating output its single earth reference. A local earth electrode connects to the earth bar. The point: every source has exactly one neutral-earth reference, and the protective conductor is continuous in both switch states. Legend (stated in words, not colour alone): L = line/live conductor; N = neutral; E/CPC = earth / circuit protective conductor.
Reported in field accounts and consistent with the design, but behaviour varies by vehicle and adapter and should be bench-verified before it is relied on. The safe default is to treat any V2L output as floating until proven otherwise.
Whether BS 7671 Amendment 4:2026 changed anything for V2X / V2L / PME / open-PEN. The existing PME and open-PEN framework appears to carry forward, but no A4-specific change to these is asserted here until confirmed against the published standard.
So, is it worth it?
For occasional backup of a few essentials during a power cut, a portable V2L setup feeding standalone appliances by extension lead (never the house wiring) is the simplest, lowest-risk use — and entirely within the manufacturer's intended use. For a permanent, scheduled arrangement that feeds part of your fixed wiring, it can work, but it is a designed-and-tested installation, not an accessory. Read the full engineering and the safe designs in the cornerstone guide before you brief an installer.
The safe, simple version
Put the car in its V2L/utility mode and run appliances directly from its socket using a suitable extension lead. No fixed wiring, no changeover, no notification — within the manufacturer's instructions and rating.
How this is made and proven compliant
- Approved Document P / Building Regulations Reg 12(6A) (England) — notifiable work; Wales, Scotland and Northern Ireland differ
- BS 7671 §722.411.4.1 (PME / open-PEN protective measures) and §551 island/switched-alternative source provisions
Design, installation, inspection and testing by a competent person. Adding an inlet circuit, changeover switch or consumer-unit alteration is normally notifiable under Part P (England; the devolved nations differ). The vehicle manufacturer does not sanction back-feeding fixed wiring from a V2L outlet.
- Initial verification to BS 7671 Part 6 with an Electrical Installation Certificate
- RCD operation proven by test in both grid and V2L modes
- The actual adapter's neutral-earth behaviour confirmed on the bench before it is relied on
- Notification handled via a competent-person scheme or building control
Confidence: Inference rolled up across the clauses cited above (the strictest state wins).
Frequently asked questions
Can my EV power my whole house?
No. A domestic consumer unit is rated around 63 A; a V2L output is only about 10–15 A. V2L is for a small essential load — lights and a socket or two, typically up to ~3.6 kW — not the whole house. True whole-home backup is V2H, which uses a dedicated bidirectional charger, not the car's V2L socket.
Can I just plug my EV into a wall socket to power my home?
No. Back-feeding a socket to energise your home wiring is dangerous and the vehicle manufacturer does not sanction it. Feeding fixed wiring from the car needs a proper changeover and a correct earth, which is notifiable work for a competent person. The safe plug-in use is running appliances *directly* from the car's socket by extension lead.
Can I use V2L while my car is charging?
No — the V2L output is not available while the vehicle is charging. A scheduled scheme typically charges the car on a cheap overnight rate and runs the essential board off V2L during expensive hours, returning to the grid before the next charge.
Is wiring this into my house legal / notifiable?
In England, adding a new circuit, a changeover switch, or altering the consumer unit is notifiable under the Building Regulations (Part P), so it must be designed, installed, tested and certified by a competent person. Wales, Scotland and Northern Ireland have their own equivalent rules.
What's the hardest part to get right?
The changeover (grid and car must never be connected together) and the earthing of a floating V2L output on a PME (TN-C-S) supply. A floating output passes a socket tester but gives no RCD protection until it is correctly earthed — a contested design that must be proven by test by a competent person.
- 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 (4)
- BS 7671:2018+A4:2026 — Requirements for Electrical Installations (IET/BSI) — cited by clause only; standard text not reproduced
- Approved Document P — Electrical safety, Dwellings (GOV.UK) — notifiable-work basis; England-specific (devolved nations differ)
- IET — Amendment 4 updates to the 18th Edition
- V2L Workshop technical reference (internal) — verified design facts and confidence flags