An EV's battery is, functionally, a very large home battery on wheels — V2H and V2G technology are starting to let people actually use it that way.
V2H: using your EV to power your home
Vehicle-to-Home lets a compatible EV's battery supply power to the home, typically during an outage, similar in concept to a whole-home battery backup system but using the vehicle's much larger battery pack instead. See our EV battery and home battery sizing calculators — an EV's battery capacity often dwarfs a typical stationary home battery, meaning genuinely extended backup potential where V2H is supported.
V2G: your EV contributing back to the grid
Vehicle-to-Grid goes further, allowing a compatible EV to actually export power back to the grid, potentially participating in grid services or earning compensation similar to how a stationary battery might participate in demand response programs — a more complex and less widely available capability than V2H.
Not every EV or charger supports this
V2H and V2G require specific vehicle hardware (bidirectional charging capability) and compatible charging equipment — most EVs and most home chargers on the market don't yet support this, though availability has been expanding. Check your specific vehicle model and any charger you're considering for explicit V2H/V2G support rather than assuming it's standard.
How this compares to a dedicated home battery
An EV used for V2H effectively serves dual purpose — transportation and backup power — potentially avoiding the cost of a separate dedicated battery system, though it also means your backup capacity is tied to wherever your vehicle happens to be parked and charged. See our battery comparison guide for related trade-off thinking, applied here to a vehicle instead of a portable unit.
Frequently asked questions
Does V2H reduce my EV's driving range?
Using the battery for home power does draw down its charge, similar to driving, so there's a real trade-off between backup power duration and available driving range afterward — plan around your actual mobility needs during an extended outage.
Is V2G compensation typically worthwhile financially?
It varies significantly by program and region — where available, V2G participation can offer some compensation for grid services, but availability and program details are still developing in most areas, so check current specific program terms rather than assuming a standard benefit.