A normal home charger moves power one way: grid to car. A bidirectional charger can send it back - turning your EV into a 60-100 kWh battery on wheels. That battery is roughly five to seven times the size of a typical home battery, which is why vehicle-to-home (V2H) keeps coming up as a backup-power answer. The idea is simple; the plumbing, compatibility and cost are not. Here is what the terms actually mean and what a working setup requires in 2026.
The four acronyms, sorted
| Term | What it powers | Typical output |
|---|---|---|
| V2L - vehicle to load | Appliances plugged into the car's outlets | 1.5-3.6 kW |
| V2H - vehicle to home | Your house circuits during an outage | 7-11 kW |
| V2G - vehicle to grid | Export to the utility, usually for a payment | Program-dependent |
| V2X | Umbrella term for all of the above | - |
V2L is the cheap, easy version: cars like the Hyundai Ioniq 5, Kia EV6 and several Chinese-market EVs have a 120V/240V outlet you can run a fridge or a few circuits from with no installation at all. V2H and V2G are the versions that need hardware between the car and your electrical panel.
What a real V2H setup needs
- A bidirectional-capable EV. The car's onboard software and hardware must support pushing power out. Current examples include the Ford F-150 Lightning, Nissan Leaf (CHAdeMO), Hyundai/Kia E-GMP cars in supported configurations, the VW ID. family in some markets, and a growing list of CCS vehicles as the standard matures. The list changes fast - check the exact model year and trim, because support is often trim- and region-specific.
- A bidirectional charger. Not a normal wallbox: a unit with an inverter that converts the car's DC battery power back to AC for your home. Examples include the Ford Home Integration System (made with Sunrun), Wallbox Quasar 2, and Emporia's bidirectional unit. Expect $2,500-6,000 for the hardware - noticeably more than the $400-700 a one-way Level 2 charger costs.
- A transfer switch or gateway. To power home circuits safely during an outage, the house must disconnect from the grid (islanding), which needs an interlock, transfer switch or smart panel. This is usually $1,000-2,500 installed.
- Utility permission. Anything that can export power - V2G, or V2H in grid-parallel mode - requires interconnection approval, the same process as a solar inverter. Islanded backup-only setups are simpler but still typically need a permit.
How much runtime do you actually get?
V2H vs a home battery
| Home battery (e.g. 13.5 kWh) | V2H setup | |
|---|---|---|
| Usable energy | 13.5 kWh | 30-70 kWh (varies by car and reserve) |
| Installed cost | $11,000-16,000 before incentives | $4,000-9,000 on top of a car you already own |
| Automatic switchover | Yes, seamless | Varies; some systems need a manual step |
| Catch | Dedicated hardware | Car must be home and charged; compatibility is model-specific |
If you already own a bidirectional-capable EV, V2H is usually the cheaper path to multi-day backup. If outages are your primary worry and you want seamless automatic backup whether or not the car is in the driveway, a dedicated battery is still the more predictable answer. See home battery storage basics for the other side of the comparison.
Where the money is: V2G and managed export
Several utilities now pay for access to your battery. Managed-export and V2G pilot programs in California, Texas, the UK and parts of Europe credit owners for discharging during evening peaks or letting the utility schedule the car's charging. Reported earnings run from about $100-600 a year for passive enrollment to more in capacity-market programs. The honest caveat: most of these are still pilots with waitlists, specific vehicle lists and specific charger requirements - treat them as a bonus, not a budget line. Pair this with the rate math in dynamic electricity tariffs explained.
What to read next
- Home battery storage basics - sizing a dedicated battery.
- Solar sizing for EV owners - adding your car to the panel math.
- Home EV charging safety guide - the rules that apply to any 240V work.
- Home Energy section - every home energy guide.
Sources: manufacturer bidirectional-charging documentation (Ford, Nissan, Hyundai/Kia, Wallbox, Emporia), utility V2G pilot program pages, and published interconnection guidance, November 2026. Vehicle and charger compatibility changes quickly; confirm your exact model year and region with the manufacturer before buying hardware.