Bidirectional charging covers several related technologies. Vehicle-to-home, or V2H, lets an EV power home circuits during an outage. Vehicle-to-load, or V2L, powers devices directly from the vehicle. Vehicle-to-grid, or V2G, can export power to the utility grid when a utility program and interconnection rules allow it.
The appeal is real: many EV batteries are much larger than a typical wall-mounted home battery. During an outage, that can mean meaningful backup time if the vehicle is home, plugged in, charged, and connected through compatible equipment.
Setup requires compatible hardware from the automaker, a bidirectional charger or home integration system, and electrical work to isolate the home safely during an outage. It is more involved than a standard EV charger. IRS Form 8911 instructions also note that bidirectional charging equipment can still be qualified refueling property if it otherwise meets the 30C rules.
See battery storage if you are comparing EV backup with a dedicated home battery.
Common questions
- Which EVs support bidirectional charging?
- Compatibility depends on the vehicle, model year, automaker hardware, charger, and home integration equipment. Confirm the exact configuration with the automaker and installer.
- Can I use my EV as a home battery backup in North Carolina?
- If the vehicle and equipment support vehicle-to-home operation, yes. The installation must safely isolate the home during an outage and should be designed by a qualified installer.
- Is bidirectional charging compatible with Duke Energy's grid in North Carolina?
- Vehicle-to-home backup and vehicle-to-grid export are different. If a setup can export to the utility grid, ask Duke Energy and your installer what approval is required before assuming it can operate that way.