The BMW wallbox rating is most likely the very same as other industrial wallboxes – the difficulty is the form of circuit on which you would install it. In the US at least, electrical code necessitates that the circuit breaker need to only supply 20% of the optimum load of the breaker. And most household wiring supports a one circuit most of 50 amps – if you use a plug-in wallbox with a 14-50 plug on a 50 amp circuit breaker, the utmost it can deliver is 40 amps. Some wallboxes even so support 48 amps, but only if really hard-wired into your electrical panel (which can be done) – ChargePoint, Wallbox (the charger) and Juicebox units are all capable of providing 48 amps (if really hard wired), and probable so is the BMW wallbox even though any information available is sketchy – consequently the 48 amps declare likely.
You CAN put in a 60 amp breaker and use a NEMA 14-60 plug with a 48 amp rated wallbox for a plug-in setup (which would be incredibly unconventional), but that demands rewiring circuits and considerably more expenditure, and actually not significantly gain. Most household charging will take place right away in any case, and you are unlikely to run your EV down to zero day by day so usual charging time with a 40 amp supply will be 6-8 several hours -slicing that down to 4-6 several hours is not that a lot achieve with usual charging use circumstance, for a ton extra trouble and price, and absolutely not Supercharger territory.
An electrician would be a good thought for any of all those scenarios, but if any one was considering Diy without the necessary pre-wiring, you could theoretically just put in a 60 amp breaker and outlet, buy a NEMA 14-60 plug, set their charging unit to 48 amps, and Voilà! 48 amps to your automobile – violating code with the chance of overloading your circuits and burning your residence down. So hard-wiring to your panel appears like a much better route if you actually wanted or desired 48 amps – extra high-priced than a plug-in but a cut price in the lengthy operate, with some small drawbacks (charging device not conveniently swappable for example).