What does Bidirectional Charging mean?

Explanation

Bidirectional charging means electricity can flow both ways through the charging cable: into the battery (normal charging) and out of the battery (discharging to power something else). This enables technologies like V2G (vehicle-to-grid), V2H (vehicle-to-home), and V2L (vehicle-to-load).

For bidirectional charging to work, three things must align: the car must support it, the charger must support it, and the regulatory and utility framework must allow it. Today, a limited but growing number of cars and chargers offer bidirectional capability. ISO 15118-20 defines the communication standard for bidirectional energy transfer.

The potential value is significant. An EV battery stores enough energy to power an average European home for 2-3 days. During a power outage, you could run essential appliances from your car. During peak electricity rates, you could discharge your car and buy cheaper electricity later to recharge. Some utilities are beginning to offer financial incentives for EV owners who participate in V2G programs.

For official definitions, visit International Energy Agency.

Where you'll see this

• In vehicle specifications
• In charging network apps

Common confusion

Not all EVs support bidirectional charging, even if they have a large battery. The car's inverter and software must be specifically designed for it. Check your car's specifications before assuming it can send power back.

Example

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