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Roadster to nema 14-50?

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I would recommend getting a J1772 charger (eg from Chargepoint or OpenEVSE)
Maybe check your local utility, as I got a $400 rebate on buying my charger.
Then you just need the CAN adapter J1772 => Roadster.

The nice side benefit is that you will also be able to charge other Teslas (all come with a J1772 adapter) and every other car.