Apple xsmax does not support 30 watts fast charge. Apple's 5v1a charging Settings have been dubbed by netizens five fu an, this combination has been to Apple 7 this generation is 5w turtle charging, and Android even up to 45w during the same period. The Apple x and 8 generation finally supports fast charging, up to 18w. Apple xs this generation uses the maximum 18w fast charge configuration.
The Apple xs max supports fast charging. The charging power of iPhone XS Max can reach up to 20W, but the charger of the phone does not support fast charging, if you want such a high power fast charging, you need to buy a set of devices that support USB PD fast charging at your own expense - charger and data cable.