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544 views In discussions and articles about electric vehicles (EVs) that could both charge and discharge their battery, I often see the assumption that if a vehicle can back-feed electricity into the grid it can also be used as a back-up power source. Well, this is far from automatic. In Vehicle-to-grid (V2G), vehicles exchange energy from their traction battery with the grid in two directions, charging or discharging. The purpose is to stabilize the grid, dampen fluctuations due to variable renewable energy such as solar, resolve bottlenecks or make arbitrage on electricity prices. This b...