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Each EVSE has a maximum output it can produce. It sends a signal (called the pilot signal) to the vehicle, and it is then up to the vehicle to never try to pull more than the device says it has. It's up to you, when plugging in the EVSE, or hard wiring one, to make sure what the device is capable of, is safe, otherwise, you may overheat the wiring TO the EVSE.
The supplied EVSE is a 10A device, so one would never expect to see more than 10A coming out of it, regardless of what is set in the vehicle (unless you told the car to use less).
If you buy a 32, 40, 50 A EVSE, regardless, this vehicle would still get the pilot signal, know what was available, but since internally, it can't use more than 16A, it would pull up to that, not the larger amount. A larger EVSE would probably help on your next PHEV or EV, that likely will be able to utilize more input. But, all you need is a device that can provide 16A at 232vac or greater input power to maximize the charging potential of the X5 45e. Power = volts * amps, and the max the 45e will draw is 3700W.
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