It's only ~£400 if you buy another Jeda USB hub (for the Model Y/post-June Model 3). It's only £325 (+ two adapters) if you want to turn a pre-June Model 3 into a post-June one, with regards to USB ports. If you don't need the wireless pad, you can just get the front USB hub and rear vents for ~£140.
USB-A ports in the Model 3 will do 5V/2A, for about 10W. The USB-C port will do 9V/3A for about 27W. So if you were looking at using a 18W MagSafe, it would be held back a bit by the USB-A.
Obviously how big a deal this is for you depends on how much you charge your phone in the car really. I don't do it much, but since this seems like something that can be retrofitted reasonably easily, I'm keen to do it.
USB-A ports in the Model 3 will do 5V/2A, for about 10W. The USB-C port will do 9V/3A for about 27W. So if you were looking at using a 18W MagSafe, it would be held back a bit by the USB-A.
Obviously how big a deal this is for you depends on how much you charge your phone in the car really. I don't do it much, but since this seems like something that can be retrofitted reasonably easily, I'm keen to do it.
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