CHAdeMO vs CCS for Bidirectional Charging

The connector standard your EV uses determines what bidirectional charging options are open to you today. CHAdeMO was the first to support vehicle-to-grid (V2G) commercially, and the Nissan Leaf is the best-known UK example. CCS is now the dominant fast-charging standard on new UK EVs, and V2G over CCS is in active development with compatible vehicles and chargers beginning to appear. If you need to work out what cables suit your car for everyday charging, our EV charging cable finder is a good starting point. The landscape is moving quickly, so compatibility depends on your car's model year and the scheme you join.

Why does the connector type matter for bidirectional charging?

Standard EV charging is a one-way process: the grid sends power to the car. Bidirectional charging reverses that flow, and the communication protocols involved are more complex. CHAdeMO was designed with bidirectional communication built in from early in its development, which is why V2G over CHAdeMO arrived first. CCS uses a different protocol stack, and V2G was added later through ISO 15118-20, which requires both the car and the charger to support it.

What is the state of CHAdeMO V2G in the UK today?

CHAdeMO V2G is the more mature option in the UK right now. The Nissan Leaf is the most widely cited compatible vehicle, involved in several UK V2G trials with energy suppliers. Bidirectional CHAdeMO chargers have been available for home installation, though they cost considerably more than a standard wallbox. The challenge going forward is that CHAdeMO is being phased out in Europe, and most new UK EVs come with CCS, so the pool of compatible cars is not growing.

How far along is CCS V2G, and when can you expect it to be mainstream?

CCS V2G is progressing but genuinely early. The ISO 15118-20 standard that enables V2G over CCS has been finalised, and a growing number of manufacturers have announced or begun rolling out compatible models. Some vehicles from the Volkswagen ID. family and others are beginning to support bidirectional CCS in certain markets, though UK availability should be verified directly with the manufacturer for your car's year and variant. This is a market to watch rather than one where broad consumer choice exists today.

Does V2L use the same connector as V2G?

Not always, and it is worth distinguishing the two. V2L lets you power devices directly from your car via an adapter at the charging port, without any grid interaction. Some Kia, Hyundai, MG, and VW models support V2L using their CCS port via an adapter, completely separately from V2G capability. If your interest is powering tools or appliances rather than exporting to the grid, V2L is a simpler and more widely available option right now. See our V2L discharge cables for what you need.

Which should you prioritise if you are buying a new EV with bidirectional in mind?

If bidirectional charging is a priority and you are buying new, CCS is the direction the market is heading. CHAdeMO V2G works well for Nissan Leaf owners today, but the standard is being phased out in Europe. For new buyers, the questions to ask are: does this model and trim support V2G or at least V2L over CCS, and is a compatible home charger available? V2L is a useful stepping stone if full V2G is not yet supported, letting you use the battery's stored energy outside the car. Check the manufacturer's specs for your specific model year.

Frequently asked questions

Can a Nissan Leaf do V2G in the UK right now?

Yes, the Nissan Leaf with CHAdeMO has been used in UK V2G schemes including commercial trials. You need a compatible bidirectional charger at home and a V2G tariff from a participating energy supplier. Check whether schemes in your area are still accepting new participants, as availability has varied over time.

Will my CCS car support V2G in the future through a software update?

Some manufacturers have indicated that V2G capability may come via over-the-air updates for cars already fitted with the necessary hardware. Whether your car qualifies depends entirely on its hardware and the manufacturer's plans. Contact your car brand directly to ask whether V2G support is planned for your specific model and year, as statements about "future support" do not always translate to a firm commitment.

Is V2G the same as a smart charger?

No. A smart charger can schedule charging for off-peak times and may respond to grid signals, but it only draws power from the grid into the car. V2G involves sending power back out of the car to the grid. Smart charging is widely available and compatible with most EVs; V2G requires a bidirectional charger and a vehicle that supports the relevant protocol.

What is ISO 15118-20 and why does it matter?

ISO 15118-20 is the international standard that defines how an EV and a charger communicate for bidirectional charging over a CCS connection. Both the vehicle and the charger must implement the standard for CCS V2G to work. It is the technical foundation that will underpin most future V2G deployments in Europe, which is why seeing it mentioned in a vehicle or charger's specifications is a positive sign.

Can I use a CHAdeMO V2G charger if my car has a CCS port?

No. CHAdeMO and CCS are physically and electronically incompatible. A CHAdeMO bidirectional charger requires a car with a CHAdeMO port. There are no adapters that convert between CHAdeMO and CCS for DC charging or V2G purposes in a consumer context.

Does V2G affect my car's MOT or insurance?

V2G participation does not directly affect your MOT, which tests roadworthiness rather than how you use the battery when parked. For insurance, it is sensible to inform your insurer that you participate in a V2G scheme, particularly if the charger involves modifications to your home electrical installation. Most major insurers are aware of the technology, but it is always better to declare any relevant change.

Whether you are currently driving a CHAdeMO-compatible Nissan Leaf or researching which CCS car to buy with bidirectional charging in mind, the picture is changing fast. The best sources of current compatibility information are your car manufacturer and your energy supplier. For a broader look at home charging options and the cables that go with them, explore our EV charging cables range or visit our Guides for more articles covering smart charging, V2L, and everything in between.