V2H (Vehicle-to-Home) refers to a bidirectional energy flow setup in which an electric vehicle can supply electricity back to a home. Instead of using the EV only as a load that consumes power from the grid, V2H allows the vehicle’s battery to act as a temporary energy source for residential use. This makes the EV not just a mode of transport, but also a flexible part of the home energy system.
What Is V2H (Vehicle-to-Home)?
Vehicle-to-Home is a form of bidirectional charging where electricity stored in an EV battery is discharged to power household circuits. In a V2H setup, the vehicle can charge when electricity is cheap or abundant, then supply power back to the home during peak tariff periods, outages, or when solar generation is low.
V2H is closely related to V2G (Vehicle-to-Grid), but the key difference is that energy flows from the vehicle to the building rather than back to the public electricity grid. In most cases, V2H is designed to support self-consumption, backup power, and residential energy optimisation.
Why V2H Matters in EV Infrastructure
V2H expands the role of EV charging beyond simple energy delivery. As homes add solar PV, home energy management systems, and dynamic electricity tariffs, the EV battery can become a useful storage asset that supports lower energy costs and better energy resilience.
For homeowners, V2H can reduce dependence on grid electricity during expensive periods and increase the value of locally generated renewable energy. For the broader EV ecosystem, V2H shows how electric vehicles can support more flexible and intelligent energy use at the building level.
How V2H Works
A typical V2H system works as follows:
– The EV charges normally from the grid or from on-site generation such as solar PV
– A bidirectional charger enables power to flow both into and out of the vehicle battery
– A compatible energy management system monitors household demand, tariffs, and battery status
– When needed, the system discharges electricity from the vehicle to selected home loads
– Safety controls, communication protocols, and switching logic ensure stable and compliant operation
In most installations, V2H requires more than a standard AC charger. It typically depends on bidirectional charging hardware, vehicle compatibility, and site-level electrical integration that supports reverse power flow safely.
Typical Use Cases for V2H
Common V2H applications include:
– Powering a home during grid outages or temporary blackouts
– Reducing electricity costs by avoiding peak tariff periods
– Using stored EV energy in the evening after daytime solar PV generation
– Improving household energy independence
– Supporting smart home energy optimisation strategies
These use cases are especially relevant where electricity tariffs vary by time of day or where residential backup power has become more important.
Key Benefits of V2H
V2H offers several practical and strategic benefits:
– Turns the EV battery into a flexible residential energy asset
– Helps increase self-consumption of renewable electricity
– Can reduce household energy bills under time-of-use tariffs
– Provides backup power capability in some system configurations
– Improves overall home energy resilience
– Supports smarter integration between EVs, buildings, and distributed energy systems
For households with high EV battery capacity, V2H can provide meaningful short-term power support, especially for essential loads.
Limitations to Consider
Although promising, V2H also has important limitations:
– Not all EVs support bidirectional charging
– Not all chargers are capable of V2H operation
– Installation is more complex than standard one-way EV charging
– Local regulations, utility requirements, and grid codes may restrict deployment
– Repeated battery cycling may affect battery degradation over time
– Backup functionality may require dedicated switching equipment and load separation
Because of these factors, V2H remains more technically demanding than conventional AC charging or smart charging.
V2H vs Other Bidirectional Charging 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) supplies electricity to a commercial or multi-unit building
– V2L (Vehicle-to-Load) powers individual appliances or external devices directly from the vehicle
– V2H focuses specifically on supplying energy to a residential property
These terms all fall under the broader category of vehicle-to-everything or bidirectional energy systems.
Technical Requirements for V2H
A functioning V2H installation typically requires:
– An EV that supports bidirectional energy transfer
– A compatible bidirectional charger
– Communication between the vehicle, charger, and energy management system
– Electrical protection and switching equipment
– Compliance with local installation rules and utility requirements
– In some cases, integration with solar PV, battery storage, or dynamic tariff platforms
The exact architecture depends on the vehicle model, charger manufacturer, and local electrical standards.
Where V2H Is Most Relevant
V2H is especially relevant in:
– Detached homes with private parking
– Residential properties with solar PV
– Homes using time-of-use electricity tariffs
– Regions with unreliable grid supply or outage risk
– Smart home and home energy management projects
– Early-stage pilots focused on bidirectional charging
As EV battery sizes grow and more compatible models enter the market, V2H is expected to become more attractive 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