Vehicle-to-Home (V2H) is a form of bidirectional charging that allows an electric vehicle to send stored electricity from its battery back to a home. Instead of using the EV only for transport and charging it only as a load, V2H turns the vehicle into a temporary residential energy source that can help power household circuits when needed.
What Is Vehicle-to-Home (V2H)?
Vehicle-to-Home describes a system in which electricity flows from the EV battery to a residential property through compatible charging and energy management equipment. This means the car can do more than just consume electricity from the grid. It can also support the home during high-price periods, low solar generation, or temporary power outages.
V2H is part of the wider vehicle-to-everything (V2X) ecosystem and is closely related to V2G (Vehicle-to-Grid) and V2B (Vehicle-to-Building). The difference is that V2H is focused specifically on supplying energy to a private home rather than a commercial building or the public grid.
Why Vehicle-to-Home (V2H) Matters in EV Infrastructure
As EVs become larger energy assets on wheels, V2H expands the role of charging infrastructure beyond simple battery replenishment. It connects electric mobility with home energy management, solar PV integration, and electricity cost optimisation.
For homeowners, V2H can improve energy resilience and reduce dependence on expensive grid electricity at peak times. For the wider energy system, it shows how EV batteries can become part of more flexible, decentralised, and efficient energy use.
How Vehicle-to-Home (V2H) Works
A typical V2H setup works as follows:
– The EV charges from the grid or from on-site generation such as solar PV
– A bidirectional charger enables energy to flow both into and out of the vehicle battery
– A home energy management system monitors household demand, battery level, and electricity pricing
– When needed, the system discharges electricity from the vehicle to the home
– Electrical protection, switching logic, and communication controls manage safety and system stability
In most cases, V2H requires more than a standard one-way AC charger. It depends on a compatible vehicle, bidirectional charging hardware, and the necessary site-level electrical design to support reverse energy flow.
Typical Use Cases for Vehicle-to-Home (V2H)
Common V2H applications include:
– Supplying household power during grid outages
– Reducing electricity costs by using EV energy during peak tariff periods
– Storing daytime solar energy in the vehicle for evening home use
– Increasing residential self-consumption of renewable electricity
– Supporting smart home energy optimisation
These use cases are especially relevant for homes with solar generation, variable tariffs, or a need for backup power support.
Key Benefits of Vehicle-to-Home (V2H)
V2H offers several important benefits:
– Turns the EV into a flexible household energy asset
– Helps reduce energy costs under time-of-use tariffs
– Improves use of on-site renewable generation such as solar PV
– Can provide backup power capability in some configurations
– Supports greater household energy independence
– Strengthens the link between EV charging and residential energy management
For homes with larger EV batteries, V2H can provide meaningful short-term support for essential household loads.
Limitations to Consider
Although promising, Vehicle-to-Home also has practical limitations:
– Not all EVs support bidirectional charging
– Not all chargers are V2H-compatible
– Installation is more complex than standard home charging
– Local regulations and utility rules may limit deployment
– Battery cycling for home energy use may contribute to battery degradation over time
– Backup power functionality may require additional switching and protected circuit design
Because of these requirements, V2H is currently more specialised than standard smart charging or conventional AC charging.
Vehicle-to-Home (V2H) vs Other V2X Models
It is useful to distinguish V2H from other related concepts:
– V2G (Vehicle-to-Grid) sends electricity from the EV back to the public grid
– V2B (Vehicle-to-Building) supports a commercial or multi-unit building
– V2L (Vehicle-to-Load) powers appliances or devices directly from the vehicle
– V2H focuses specifically on powering a residential property
All of these fall under the broader category of bidirectional energy systems.
Technical Requirements for Vehicle-to-Home (V2H)
A functioning V2H installation usually requires:
– An EV that supports bidirectional energy transfer
– A compatible bidirectional charger
– Communication between the vehicle, charger, and home energy system
– Electrical protection and switching equipment
– Compliance with local grid connection and installation rules
– In some cases, integration with solar PV, home batteries, or dynamic tariff platforms
The exact setup depends on the vehicle model, charger type, and local electrical requirements.
Where Vehicle-to-Home (V2H) Is Most Relevant
V2H is especially relevant in:
– Detached homes with private parking
– Residential properties with solar PV systems
– Homes using time-of-use electricity tariffs
– Areas with higher outage risk or weak grid reliability
– Smart home energy projects
– Early-stage bidirectional charging deployments
As more EVs and chargers support two-way energy flow, V2H is likely to become more relevant in residential energy planning.
Related Glossary Terms
Bidirectional Charging
V2G (Vehicle-to-Grid)
V2B (Vehicle-to-Building)
V2L (Vehicle-to-Load)
Smart Charging
Home Energy Management System
Solar PV Integration
Time-of-Use Tariffs
Load Balancing
ISO 15118