Bidirectional charging: V2L, V2H and V2G explained

Bidirectional charging splits into three levels of ambition. Vehicle-to-load (V2L) is the simplest: the car has a regular AC socket and you plug a kettle, fridge or power tool into it directly. Vehicle-to-home (V2H) connects the car's DC pack through a special charger to your home's electrical panel — the car can run the house during a power cut or during expensive peak hours. Vehicle-to-grid (V2G) goes one step further and lets the car export power back to the electricity grid, usually in response to a price signal.

V2L is already common — many 2024–2026 EVs include it. V2H is just arriving on the consumer market in the UK, France and Australia. V2G is operational in pilot form (Octopus, EDF, Nissan, Hyundai) but mainstream rollout depends on grid rules that are still being written.

V2L typically delivers 1.5 to 3.6 kW from a domestic socket built into the car (in the boot, on the dashboard or via an adaptor on the charging port). That is enough to run a fridge for several days, power tools on a job site, an espresso machine and induction hob for outdoor cooking, or a small camping setup.

A 77 kWh pack at full charge holds enough energy to power an average 3-person household for roughly 2.5 days if appliances are used sparingly. Most cars cap V2L draw to protect the pack and will stop discharging at a user-set state of charge (typically 20%).

V2H requires a more capable charger — usually 7–11 kW bidirectional DC, costing roughly £4,500–£7,500 installed in the UK in 2026. The charger sits between your meter and the car and switches between charging the EV (cheap rate), powering the house from the EV (peak rate), or exporting solar surplus into the EV.

With a UK Octopus IO tariff and a 60 kWh pack used as a home battery, real-world savings are around £350–£600/year on top of the usual home-charging savings, plus power-cut protection. Payback on the extra hardware is currently 7–10 years, falling fast as charger prices drop.

V2G lets the energy company pull power from your car when the grid needs it (typically winter evenings or sudden generation drops) and pay you for it. Octopus's Powerloop pilot in the UK pays around 30 p/kWh exported; CALeBattery in France pays €0.18–0.25/kWh; AGL in Australia's pilot pays AU$0.20–0.40/kWh.

Real-world Powerloop participants earn £300–£900/year on a Nissan Leaf with a CHAdeMO bidirectional Wallbox Quasar, depending on usage. The car still hits its morning charge target. The downside: V2G requires either a CHAdeMO car (limited) or a CCS bidirectional charger (rare and expensive in 2026).

Marketing claims and OEM software updates have moved this list a lot in the last 18 months. Current state as of mid-2026:

For V2L you need only the car and the V2L adaptor or socket. For V2H or V2G you need a bidirectional DC charger and, in most countries, an electrician-installed isolation relay so the car can power the house safely when the grid is down.

Bidirectional chargers shipping in the UK in 2026 include the Wallbox Quasar 2 (CCS, 11 kW, ~£5,500 installed), the Indra V2H (7 kW, CHAdeMO and CCS variants), and the Sigenergy SigenStor (10 kW, CCS, with integrated solar inverter). In France, Renault's Mobilize Powerbox supports the new Renault 5 E-Tech V2G use case.

Discharging the pack to power the grid adds cycles, which in theory accelerates degradation. In practice, OEM testing and the Nissan Powerloop fleet data show the effect is small. A pack cycled by V2G typically loses 1–2% more capacity per year than a purely driving pack — equivalent to driving an extra 8,000–15,000 km/year.

Most V2G tariffs cap the discharge depth (typically 20–80% SoC) and avoid high-rate discharge, which is the kindest possible use of the pack. Both Hyundai-Kia and Nissan now include V2G use under their standard 8-year battery warranty.

Bidirectional charging is far ahead in regulation in the UK, the Netherlands, Germany and Australia. UK G98 / G99 grid-code allows V2G with an approved bidirectional inverter; the SEG (Smart Export Guarantee) gives you a baseline export tariff if your supplier doesn't have a V2G product.

France and Italy are catching up — Enedis and Enel X are running pilots and the EU AFIR regulation requires public V2G capability on new large-scale chargers from 2027. The US is fragmented: California and New York are V2G-ready, much of the rest of the country is not.

V2L is the easy yes — it costs nothing extra on a supported car and is genuinely useful. V2H starts paying for itself if you have time-of-use tariffs and frequent power cuts, or if you have rooftop solar with limited static-battery capacity. V2G is currently most attractive in the UK (Octopus Powerloop) and Australia (AGL, Amber) where tariff structures already reward grid services.

If you are buying a car in 2026 and want to keep options open, choose one with bidirectional-capable hardware (Ioniq 5, EV6, EV9, Nissan Ariya). Software activation can follow even if the tariffs in your country aren't ready yet.

A typical UK semi-detached home uses 8–14 kWh on a winter day if heating is run on gas and 25–35 kWh if heating is electric (heat pump). A 75 kWh Kia EV9 with V2H enabled can therefore power a gas-heated home for roughly five days from full, or an all-electric home for around two and a half days.

On the Octopus Power-Up tariff, the same EV9 used as a battery to time-shift consumption — charging at 7p/kWh overnight, drawing the house from the car during the 4–7pm peak at 34p/kWh — saves around £1.80 per day on a 7 kWh peak window. Across a year that is roughly £650, before degradation costs which Hyundai-Kia warrants out under normal V2H cycles.

Octopus, OVO, and EDF all run V2G or V2H trials in 2026; uptake is still in the low tens of thousands of homes. The hardware constraint — a bidirectional CCS wallbox — remains the bottleneck, not the cars.

Regulation and grid-code work are the real gating factor, and progress varies sharply by country. The UK is furthest along, with G99-approved bidirectional units from Wallbox Quasar 2 and Indra; France authorises V2G under the same network-code envelope but very few utilities offer retail tariffs; Italy approved bidirectional grid connections in the 2024 ARERA framework but installed base is tiny; Australia opened the AS/NZS 4777.2 standard to bidirectional inverters in 2024 and is now seeing the first AC V2H deployments in NSW and Victoria.

The car side is converging. From 2026 most new Hyundai, Kia, Volvo, Polestar, Renault, MG and BYD models support at least V2L (vehicle-to-load) out of the box, with V2H and V2G enabled in firmware where the bidirectional wallbox is available. Tesla has confirmed Model 3 and Model Y bidirectional capability via a future hardware revision and home Powerwall integration.

The most repeated myth is that V2G will rapidly wear out the battery. The opposite is closer to true: shallow daily 20–30% cycles at low C-rates are the most benign duty an EV pack can be put to. Long-term trials by Nissan/UK Power Networks and CSIRO in Australia have shown no measurable additional degradation versus driving-only control cars.

A second myth is that V2H needs solar PV. It does not — V2H simply uses the car as a household battery. Solar pairing makes the economics better, but a V2H household on a time-of-use tariff alone can already save meaningful money.

A third is that bidirectional means you can power a house from any EV via the standard CCS port. You cannot — the car, the wallbox and the grid connection all have to be V2H-rated. A V2L-only car (most 2022–2024 EVs) only supports portable appliance use through the in-cabin three-pin or Schuko socket.