18 w。
iPhone 11 maximum support 18W fast charge, according to the introduction, 30 minutes can be full of 50% power, charging speed increased a lot, but the 18W power adapter is not standard, the standard charger is 5W.
The iPhone 11 also supports wireless charging, but supports up to 7.5W wireless chargers, similarly, wireless chargers need to be purchased by themselves, and are not standard.
According to Apple's official data, the Apple 11 fast charge supports up to 18 watts of fast charge