For much of any given day, EVs are parked in garages or at offices. When paired with a power control system, the battery packs in those EVs are functionally little different than a stationary battery system.
One big difference: EV battery packs are much larger. Many EVs on the market today are outfitted with battery packs with capacities ranging from 40 to 65 kilowatt-hours. Tesla vehicle battery packs are even larger: up to 100 kilowatt-hours in the Model S or Model X. By comparison, Tesla’s Powerwall home battery has a 13.5-kilowatt-hour nameplate capacity.
Home battery systems can help during power outages. So can the battery packs rolling around in electric vehicles.