Ask a driver what they want from charging and the answer is almost never a number. It is that the car is ready when they need it, that the cost is predictable, and that they do not have to think about any of it.
That is a scheduling problem more than an engineering one. A car that sits on a driveway from six in the evening until seven the next morning has thirteen hours to absorb a charge that takes two. The remaining eleven hours are the product.
Used well, those hours smooth out demand on the local network, soak up cheap overnight generation and cut the bill by more than half on most time-of-use tariffs. Used badly, every vehicle on the street starts charging the moment its owner walks through the door, and the substation carries the consequence.
The industry has spent years selling speed because speed is easy to put on a spec sheet. The more useful measure is how little attention a charger demands over a year of ownership. That is the number we design towards.
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