How we tested.
Your EV sits parked 22-23 hours per day. During those idle hours, its battery holds enough energy to power an average home for one to three days. V2G proposes feeding some of that stored energy back to the grid when demand is high, earning money in the process.
How It Works
Standard charging is one-directional. V2G adds bidirectional capability requiring: a bidirectional charger (converts DC back to AC), communication software between EV, charger, and grid operator, and grid interconnection meeting utility standards.
Economics
Arbitrage: charge off-peak at $0.05-0.10/kWh, sell peak at $0.15-0.30/kWh. Demand response payments during stress events. Frequency regulation services for grid stability. Estimated $300-1,500 per year earnings.
V2G-Capable Vehicles
Nissan Leaf (CHAdeMO connector), Ford F-150 Lightning (Intelligent Backup Power), Hyundai Ioniq 5 and Kia EV6 (V2L with V2G upgrades), and several BYD models in the Chinese market.
Challenges
Battery degradation concerns (research shows minimal impact from shallow V2G cycling). Bidirectional charger costs ($3,000-6,000). Regulatory frameworks still developing in many markets.
The Bigger Picture
If 10% of projected 2035 EVs participated, they would represent more storage capacity than all planned grid-scale batteries. V2G could be a pillar of the future energy system.