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30amps would be 6.6kwh, or what is common for an on board charger to max out at, but charging stations you can adjust their max output, down to 10 amps on some.
The question is, do you want options in the future?
You then have two options, conduit running to the breaker box, or run the next size larger wire, 8 gauge would be plenty big for 40 amps.
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