But offering battery capacity to the grid is notlikely to be a daily commitment, thereby effectively educimg the owner's usable range. There are already many who get virtually all of they EV energy from PV at home. Many of them do not use their cars for extended journeys every day or even every week,* thus there is a local store that is charged when the grid is not short of energy and can be sold when grid demand is high.Ultimately the business case only works out if batteries are expensive enough to require strenuous efforts to maximally utilise them, and yet cheap enough that people are going to tolerate battery capacity being taken off them to use for grid operation. If the battery cost estimates from electric-car boosters are even close to accurate their simply won't be any need for any of this because it will be cheaper not to bother with this enormous bureaucracy and just stack more grid side batteries with their lower losses.
Some would be retired, others WfH whose mileage is pretty predictable from week to week.
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Only if they have been charged from the grid. As I said above, a significant source will be from EVs topped up every day from PV systems. Feeding 230V back into the local distribution system is doubly efficient as:Only available for charging or discharging at certain times of day, they have serious restrictions on their capacity and their charge state at various times of day, and their position at the extremities of the grid system leads to major resistive roundtrip losses.
a) it hasn't used LV cables in the charging period (other than the domestic PV wiring and inverter which is transparent to the DNO)
b) if red into a residentiallowe voltage system, it offsets the local loads which then have lower losses in their path
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