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You wouldn't be exclusively charging at those speeds, though.

Why not? I don't have an EV but in the US I've heard of people outfitting their homes with 240V sockets for higher-speed charging

240V isn’t supercharging. That’s level 2. The difference between level 2 and supercharging is 17 kilowatts vs. 140 kilowatts.

240v isn't high speed charging for EVs.