vehicle to load

Vehicle-to-grid (V2G) describes a system in which plug-in electric vehicles (PIEVs) sell demand response services to the electrical grid. Such services are either backfeeding electricity to the grid, or reducing the rate of charge from the grid at different times of the day. Demand services reduce demand peaks for grid supply, and hence reduce the probability of disruption from load variations. Vehicle-to-load (V2L) and vehicle-to-vehicle (V2V) are related concepts, but the AC phase is not synchronised with the grid, so the power is only available to "off-grid" loads.
Plug-in electric vehicles include battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs). They share the ability to store electricity in their on-board battery modules, which are typically used to propel the vehicle's electric engine. V2G allows some of this energy storage to be sent to the grid, turning the vehicle into a small-scale grid battery that is eligible for claiming feed-in tariffs. A 2015 report found that vehicle owners could receive significant payments by charging their EVs at off-peak times when grid electricity is cheaper, storing it in their car battery, and selling it back to the grid at peak times when electricity prices are higher due to congestion pricing.
Rechargeable batteries have a finite number of charge cycles, as well as a limited shelf-life, so V2G can reduce battery longevity. Battery capacity is a complex function of battery chemistry, charge/discharge rates, temperature, state of charge and age, but is improving as technology improves. Most studies of the effects of V2G on battery life show that slower V2G discharge rates lessen degradation, while one study suggested that using vehicles for grid storage could improve longevity.
Some hydrogen fuel cell vehicles (HFCVs) are also equipped with V2G functions. HFCVs with fuel tanks containing 5.6 kg (12 lb) of hydrogen fuel can deliver more than 90 kWh of electricity. Vehicle batteries may hold 100 kWh or more.
Uni-directional V2G (UV2G) charging is technically simpler than delivering power from an EV battery, which many PIEVs are not equipped to do. As of 2024, most EVs require a separate inverter than the one used to power the propulsion motors in order to output AC power from the battery. UV2G can be extended by throttling other activities such as air heating and cooling.

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