# 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.

## 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.

> **Reg 12(6A)** (Building Regulations (England), confidence: verified) — 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; standard text 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**.

1. **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.
2. **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.

> **§722.411.4.1** (BS 7671, confidence: inference) — 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; standard text not reproduced._

**Figure: V2L / PME changeover earthing circuit.** On a PME (TN-C-S) supply the V2L island gets its own earth reference — the CPC stays continuous, the neutral-earth bond is switched in only on V2L, and a local electrode provides the earth.

_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._

> **Confidence: inference** — Some EV V2L outputs (e.g. as reported on the Hyundai Ioniq 5) are floating — no internal neutral-earth bond. (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.)

> **Not confirmed (safety-critical):** 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

**What governs it:** 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

**Who may do it:** 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.

**How compliance is demonstrated:** 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

## FAQ

### 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.

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_Author: Martin — qualified UK electrician (BEng Mech Eng; vehicle mechanic)._
_Last reviewed: 14 June 2026. Written against: BS 7671:2018 + A4:2026._
_Status: reviewed. General information, not project-specific design advice._
_[How we source this](/methodology) — evidence hierarchy, confidence flags and source policy._

## Sources

1. BS 7671:2018+A4:2026 — Requirements for Electrical Installations (IET/BSI) — https://electrical.theiet.org/bs-7671-18th-edition-wiring-regulations/about-bs-7671/ (cited by clause only; standard text not reproduced)
2. Approved Document P — Electrical safety, Dwellings (GOV.UK) — https://www.gov.uk/government/publications/electrical-safety-approved-document-p (notifiable-work basis; England-specific (devolved nations differ))
3. IET — Amendment 4 updates to the 18th Edition — https://electrical.theiet.org/amendment-4-updates-to-18th-edition
4. V2L Workshop technical reference (internal) — verified design facts and confidence flags