V2G / V2H, what’s the difference?
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- Mar 1, 2021 11:33 am GMTFeb 27, 2021 11:36 am GMT
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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 bidirectional exchange with the grid can be through the home’s wiring in which parking or garage the car is parked and plugged. It requires a bidirectional charger, with power electronics that can transform Alternative Current (AC) from the grid into Direct current (DC) for the battery and vice-versa. It can be either on-board the car, or off-board, for example in a wallbox.