# What V2L can actually power — essential loads vs whole-home

> An EV's V2L output is small — typically about **2.3–3.6 kW** (≈10–15 A at 230 V), depending on the car and adapter. That is enough to keep a few **essential** loads running — lighting, a fridge or freezer, a router, phone and laptop charging, and one small radial socket — provided you keep the **total** draw within roughly **80%** of the rating (about 2.4–3.0 kW on a 3.6 kW output). Trying to run the **whole house** is a gross overload: a domestic consumer unit is rated around 63 A, the car around 10–15 A. You also **cannot** use V2L while the car is charging. Confirm every appliance's actual rating, and remember the vehicle manufacturer does not sanction back-feeding fixed wiring.

## In short

- Typical V2L output is ~2.3–3.6 kW (≈10–15 A at 230 V) — verify your car and adapter's figure.
- Size for **essential** loads only: lights, fridge/freezer, router, device charging, one small radial socket.
- Keep the **total** simultaneous draw within ~80% of the rating (~2.4–3.0 kW on a 3.6 kW output) to allow for surge and headroom.
- Whole-home is a gross overload — a ~63 A consumer unit fed from a ~10–15 A source. Don't.
- You cannot use V2L while the car is charging; appliance wattages here are typical ranges, not your appliance's rating.

**Where this stops:** This is a sizing guide, not a wiring recipe. Any arrangement that feeds a home's fixed wiring must be designed, installed and tested by a competent person.

## The short answer

An EV's V2L output behaves like one ordinary household circuit, not like a whole consumer unit. On most European-market cars that means around **2.3–3.6 kW** — roughly **10–15 A at 230 V** — though the exact figure depends on the car, the adapter and the firmware, so check yours. Treat that as your whole budget. The realistic job is keeping a handful of **essentials** alive — lights, a fridge or freezer, the broadband router, device charging, and perhaps one low-power tool or appliance on a single radial socket.

> **Think in watts, and leave headroom** — Add up the running wattage of everything you want on at once, then keep the total within about 80% of the V2L rating — roughly 2.4–3.0 kW on a 3.6 kW output. The 20% margin covers motor start-up surges (a fridge compressor briefly pulls several times its running watts) and stops you sitting on the limit.

## What 'essential loads' typically look like

The figures below are **indicative typical ranges** to help you build a budget — they are **not** your appliance's rating. Always read the actual wattage from the rating plate or manual, because models vary widely and motors surge on start-up.

- **LED lighting** — a whole room's worth is often only tens of watts; even a generous allowance for several rooms is usually well under 200 W.
- **Fridge or freezer** — typically runs at a low average wattage but draws a brief, much larger surge when the compressor starts. Budget for the surge, not just the running figure.
- **Broadband router / Wi-Fi** — small, typically in the low tens of watts.
- **Phone and laptop charging** — small, typically tens of watts per device.
- **One small radial socket** — for a single modest appliance or tool. This is where it is easy to overshoot: a kettle, toaster, microwave, electric heater, hairdryer or iron can each draw 1–3 kW on its own and can swallow most or all of the budget instantly.

> **Heating loads are the budget-killer** — Anything that makes heat — kettles, toasters, electric heaters, immersion elements, hairdryers, irons — runs at 1–3 kW and can use most of a 3.6 kW V2L output by itself. These are what tip a small source into overload. Plan around them, don't run several at once.

## Why whole-home is a gross overload

A typical domestic consumer unit is rated around **63 A**; an EV's V2L output is around **10–15 A**. Connecting the whole board to V2L does not magically share the car's small output across every circuit — it just means the first few appliances that switch on demand far more current than the car can deliver. The source can't supply it, so the result is a collapsing voltage and a tripped or stalled supply, not a working backup. The correct scope is a **small essential sub-board**, sized deliberately, never the main board.

> **Confidence: verified** — A domestic consumer unit (~63 A) cannot be run from a V2L output (~10–15 A) — it is a gross overload. (Arithmetic: the source can deliver roughly a quarter to a fifth of the board's rated capacity. This is a sizing fact independent of any particular car; it is why the design scope is a small essential board, not the whole house.)

> **Chapter 41 (§411)** (BS 7671, confidence: inference) — Protection against electric shock relies on the supply being able to drive enough fault current to operate the protective device within the required disconnection time. A small vehicle source delivers far less prospective fault current than the grid, so a competent person must confirm protection and overload behaviour still hold in V2L mode — another reason the load is kept small and well within the source's rating. _Reference only; standard text not reproduced._

## You can't use V2L while the car is charging

The V2L output and charging use the same power electronics, so the car cannot discharge to your loads and take a charge at the same time. For a load-shifting plan this is the natural rhythm anyway: charge the car on a cheap overnight rate, then run the essential board off V2L during expensive hours, returning to grid before the next charge. For backup, remember the car is a battery you can't refill on the spot — once it hits its discharge cut-off you need to charge it before V2L is available again.

## How to build your own budget

1. Find your car and adapter's **continuous** V2L output in watts (or amps × 230 V). Use the manufacturer's figure, not a forum guess.
2. Take **80%** of it as your working budget — e.g. 0.8 × 3.6 kW ≈ 2.9 kW.
3. List the appliances you genuinely need on **at the same time** and read each one's wattage from its rating plate.
4. Add a generous margin for anything with a **motor** (fridge, freezer, pump) to cover its start-up surge.
5. If the total fits inside the budget, it is plausible — and then it is a competent person's job to design, install and test the actual changeover and earthing before anything is connected to fixed wiring.

> **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.

> **A realistic small-essentials set** — Lighting, a fridge-freezer, the router and a couple of charging devices typically sit comfortably inside a 2.4–3.0 kW budget — leaving a little room for one low-power appliance on a single socket. That is the kind of load V2L is genuinely good at.

## FAQ

### How much can an EV's V2L actually power?

Typically around **2.3–3.6 kW** (≈10–15 A at 230 V), depending on the car, the adapter and the firmware — check your own. That is roughly one household circuit's worth: a few essentials, not the whole house. Keep the total simultaneous draw within about 80% of the rating.

### Can I run my whole house from my EV?

No. A domestic consumer unit is rated around 63 A and a V2L output is around 10–15 A, so the whole board would be a gross overload. The correct scope is a small **essential** sub-board (lights, fridge/freezer, router, charging, one small socket).

### Can I run a kettle, heater or other heating appliance?

One at a time, maybe — but heating loads (kettles, toasters, electric heaters, hairdryers, irons) draw 1–3 kW each and can use most of a 3.6 kW output on their own. They are the easiest way to overload a small source, so don't run several together and watch your budget.

### Why keep the load within 80% of the rating?

The 20% margin covers start-up surges — a fridge or freezer compressor briefly pulls several times its running wattage — and keeps you off the limit. Sitting at 100% leaves no room for the next thing that switches on.

### Can I use V2L while the car is charging?

No — the V2L output and charging share the same power electronics, so you can't do both at once. A typical plan charges the car cheaply overnight and runs the essential board off V2L during expensive hours, returning to grid before the next charge.

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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. V2L Workshop technical reference (internal) — verified design facts and confidence flags (load-sizing rule (~80% of rating), 63 A board vs ~10–15 A source overload, V2L-not-while-charging)
2. V2L Workshop — Vehicle-to-Load complete guide (internal) — power-output overview (manufacturer-stated output ranges; figures vary by model/trim/market/firmware — verify before relying on them)
3. 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 (Chapter 41 / §411) only; standard text not reproduced)