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You can but with a standard 120V (12/15A) outlet you'd spend days charging an EV with a large battery. Anything that takes more than 8-10 hours is not really a feasible option. A 240V outlet can be 32A which would be a lot more reasonable in terms of charging time.

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it adds about 5 miles per hour for model 3. So after charging overnight it would be at least 50 miles of range added. And this is enough for many.

Which is still very slow, as I said above. The fact that you can get a tenth of the battery charge after a full night is not fast by any measure. Consider that our driving habits have been formed around getting hundreds of Km/mi worth of range in minutes. And if a gas pump would only fill 6 liters at a time nobody in the world would say “well it’s still more than most people need”.

The conversation completely changes as you're not going to a gas station to fill up, you're parking your car at home or plugging it in while you shop. You have fast charging on the highway which, at least for the more powerful ones, can fill you up to 80% in 40 minutes.

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