If you own an electric vehicle in Redhill or elsewhere in Surrey, you may already be familiar with charging overnight at home. The next development is bidirectional charging: technology that allows electricity to flow both into and out of your EV battery.
In practical terms, this could allow your car to support your home, make better use of solar energy or export electricity to the grid. But while the idea is promising, V2G charging is still an emerging technology in the UK in 2026.
This guide explains how it works, what is currently available and whether it is worth considering when arranging EV charger installation in Surrey.
What is bidirectional EV charging?
A standard home EV charger is one-way. It takes electricity from your home supply and sends it to your vehicle:
Grid or solar panels → charger → EV battery
A bidirectional charger allows electricity to flow in both directions:
Grid or solar panels ↔ bidirectional charger ↔ EV battery ↔ home or grid
There are three commonly used terms:
Vehicle-to-grid (V2G)
V2G allows your EV to export stored electricity to the public electricity network. A smart energy tariff may charge the vehicle when electricity is cheaper and export energy when demand or prices are higher.
Vehicle-to-home (V2H)
V2H uses your EV as a large home battery. The vehicle can supply electricity to your property, potentially reducing electricity purchased from the grid or providing backup power.
However, a V2H system must include suitable controls and an approved changeover or islanding arrangement if it is expected to operate during a power cut.
Vehicle-to-load (V2L)
V2L supplies electricity directly to appliances or equipment through a vehicle outlet or adapter. It is useful for powering tools, camping equipment or individual devices, but it does not automatically supply your home’s fixed wiring.
These terms are often used interchangeably in advertisements, so it is important to establish exactly what a vehicle and charger combination can do.
How does V2G work at a Redhill home?
A working V2G system normally requires three elements:
- A compatible EV
- A compatible bidirectional charger
- A smart tariff or energy management system
The charger controls when your car charges and when it discharges. For example, it might charge overnight during a cheaper time-of-use period. During the day, it could send some stored energy to your home, particularly when demand is higher.
If your home has solar PV, the system might also prioritise storing surplus daytime generation in the vehicle. You could then use that energy in the evening rather than exporting it at a lower rate and buying electricity later at a higher price.
The system needs to protect your vehicle’s minimum range. Smart controls should ensure that the car is ready for your commute or other journeys rather than discharging the battery without permission.
Why V2G could suit Surrey households
Redhill has many households with regular commuter journeys into London, Croydon, Reigate and other parts of Surrey and Sussex. This often means a vehicle may be parked at home overnight and again for several hours in the evening, exactly the periods when smart charging and energy management can be useful.
Some potential benefits include:
Lower-cost overnight charging
A time-of-use tariff may allow your EV to charge when electricity prices are lower. Depending on the tariff, the battery could then support your home during more expensive periods.
Energy arbitrage
Energy arbitrage means buying electricity at a lower price and using or exporting it when the value is higher. The financial benefit depends on tariff rates, fees, export arrangements and how frequently the vehicle is used.
Better solar self-consumption
If you have rooftop solar panels, your EV could store surplus generation during the day. This may be particularly useful for homes where the car is parked during working hours.
Backup power potential
A suitable V2H installation may provide limited backup power during an outage. This is not automatic. The installation must safely disconnect from the public network and provide the correct protection. A standard smart EV charger must never be used to back-feed a property during a power cut.
Reduced pressure on the electricity network
If thousands of EVs charge outside peak periods, they can reduce simultaneous demand. In the future, coordinated V2G systems could help balance local and national electricity networks.
Future-proofing
Installing suitable cable routes, protection and electrical capacity now may make it easier to upgrade to bidirectional hardware later, even if you choose a standard charger initially.
The 7kW single-phase reality in most Redhill homes
Most domestic properties in Redhill have a single-phase electricity supply. A typical home EV charger provides up to around 7kW, although the actual charging rate can be affected by the vehicle, supply capacity, cable length and other electrical loads.
Bidirectional charging can introduce additional design considerations because the system is both an EV charger and an electricity export device. Export capacity may be limited, and some installations require DNO approval under the relevant G98 or G99 process.
In Surrey, the local distribution network is typically operated by UK Power Networks, although the installer should confirm the responsible DNO for your address. GOV.UK guidance treats V2G-enabled charge points as energy devices that may need to be registered or approved.
You can review the official guidance on registering energy devices in homes or small businesses.
Which EVs support V2G in 2026?
This is currently the biggest limitation.
A vehicle may have the technical hardware for bidirectional charging but still be unable to participate in a UK residential V2G tariff. The car, software, charger, energy supplier and DNO requirements all need to align.
In 2026, the combinations most commonly reported as available for live UK residential V2G include:
- BYD Dolphin with a compatible Zaptec Pro system
- Nissan Leaf with a Wallbox Quasar v1
- Nissan e-NV200 with a Wallbox Quasar v1
- Mitsubishi Outlander PHEV with a Wallbox Quasar v1
Octopus Energy’s Power Pack has been reported as the main live residential V2G route for these specific combinations. Availability, eligibility and tariff terms can change, so you should confirm the current position directly with the energy supplier before buying equipment or a vehicle.
Other vehicles, including selected Hyundai, Kia, Renault, Volkswagen Group, Volvo and Polestar models, may offer V2H, V2L or future V2G capability. However, technical compatibility does not guarantee that a vehicle can export electricity to the UK grid today.
What does a V2G installation involve?
A bidirectional installation requires more than simply replacing a standard wall charger.
An electrician should assess:
- The condition and capacity of the consumer unit
- Main service fuse and available electrical capacity
- Earthing and bonding arrangements
- The proposed charger location
- Cable length, containment and physical protection
- Residual current and overcurrent protection
- Solar PV, battery storage or other generation equipment
- Export limits and DNO requirements
- Whether backup operation is required
- The vehicle and charger manufacturer’s installation requirements
Older homes may need a consumer unit upgrade or other remedial work before an EV charger can be installed. Cable routes through garages, side passages and external walls also affect cost and appearance.
Use an electrician who understands EV charging, BS 7671, Part P requirements and the relevant DNO process. Choosing an NICEIC Approved Contractor provides an additional indication that the business operates within recognised competency and assessment requirements.
Is V2G expensive compared with a standard smart charger?
Yes, in most cases.
A conventional smart charger is simpler, more widely supported and usually less expensive to install. A bidirectional system involves specialist hardware, compatibility checks, commissioning and potentially more complex grid-connection arrangements.
You may also need to consider:
- Additional electrical upgrades
- DNO application or notification work
- Solar or home battery integration
- Energy management subscriptions
- Tariff restrictions
- Vehicle warranty conditions
- Battery degradation and manufacturer limits
Battery degradation is an important question. Regular cycling may affect long-term battery performance, although the impact depends on battery chemistry, depth of discharge, temperature and the manufacturer’s controls. Ask the vehicle manufacturer whether V2G use is covered by the warranty.
Should you install V2G now or wait?
For most Redhill households, a high-quality standard smart charger is still the sensible near-term option if you need dependable home charging today.
Consider V2G now only if:
- Your exact EV is supported
- The charger is certified for that vehicle
- A suitable tariff is currently available
- You understand the export and backup limitations
- Your property has adequate electrical capacity
- The financial case works after installation costs
- You are comfortable with an emerging technology
If your main objective is convenient and affordable overnight charging, a standard 7kW smart charger may provide better value. If you are installing solar panels, upgrading your consumer unit or planning a new-build electrical system, it can still be worthwhile asking your electrician to prepare for future bidirectional equipment.
Questions to ask an electrician
Before committing to a V2G installation, ask:
- Is my exact UK vehicle model and software version compatible?
- Is the proposed charger genuinely bidirectional, or is it only a smart one-way charger?
- Can the system provide V2G, V2H, V2L or only one of these?
- Will the installation need G98 notification or G99 approval?
- Who will deal with the DNO and provide the completion documentation?
- Does my consumer unit, earthing and incoming supply meet the requirements?
- Can the system operate safely during a power cut?
- Will V2G use affect my vehicle warranty?
- What happens if the tariff or manufacturer support changes?
- What is the total cost compared with installing a standard charger?
For businesses, the questions should also cover fleet charging, workplace demand, peak power limits, load management and whether vehicles are parked long enough to support energy export.
Frequently asked questions
Can my EV power my Redhill home today?
Possibly, but only with a compatible vehicle, bidirectional charger and correctly designed electrical installation. Many EVs support V2L or have future V2H capability without currently supporting live UK residential V2G.
Can a normal 7kW charger send power back to my house?
No. A standard smart charger is designed to charge the vehicle. It does not safely export electricity to the property or grid.
Will V2G keep my lights on during a power cut?
Not necessarily. Backup power requires approved equipment that can isolate the property from the grid. This must be designed and installed by a competent professional.
Does V2G need DNO approval?
It may require DNO notification or formal approval, depending on the system, export capacity and connection arrangement. Your installer should confirm the correct process before work begins.
Is V2G worthwhile if I do not have solar panels?
It may still reduce costs through time-of-use charging and energy arbitrage. However, the financial case depends heavily on your tariff, driving pattern and equipment cost.
Talk to ADS Electrical about EV charging in Surrey
Whether you need a standard home charging point today or want to investigate future bidirectional charging, the electrical installation should be assessed properly first.
ADS Electrical is a NICEIC Approved Contractor serving Redhill, Surrey and surrounding areas. We can review your consumer unit, earthing, cable route and available capacity before recommending a suitable solution. We provide free quotes within 24 hours, communicate clearly throughout each project and offer 24-hour emergency call-outs when urgent electrical assistance is required.
Arrange your home charging point Surrey consultation or contact a qualified electrician in Redhill to discuss your property and vehicle.
Technology, vehicle compatibility and energy tariffs are changing quickly. Always confirm current manufacturer, supplier and DNO requirements before purchasing a bidirectional charger or relying on V2G income.