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Tesla Wall Charger

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It's not about age. Only LR and Performance versions of the M3/MY can charge at up to 48 Amps when connected to a wall connector.

On a 50 Amp circuit you would be limited to 40 Amps (9.6 kW) if your car was a LR or P. You'd need a 60 Amp breaker to be able to charge at 48 Amps/11.5 kW.