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The vehicle has a maximum input of 16A, while the included device is a 10A one. SO, yes, you can increase the charging rate, but don't 'need' anything bigger than 16A at your 220vac input Power = volts * amps, so 220*16= 3520W, still not quite the maximum the vehicle can accept, but if your voltage truly is 220vac, that's it. To max it out at 16A, you'd need 3700/16=231.25vac coming in. A higher amperage unit won't help, but would be good for future proofing as many vehicles will benefit from a higher rate. All vehicles limit their charging based on what the EVSE says in amps, and never tries to pull more than that, and on the X5, that's 16. In my case, I have about 247vac coming in normally, so a 16A device would max mine out, but I have a 30A unit I installed for my i3 years ago.
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