Does anyone know the max wattage an iPhone 12 will draw. I don’t see the point in buying say the 30W if it doesn't charge above 20. Anyone know where this information is available. Thanks.
In short, a 30W don't damage battery ofc and you can expect a very slight speed boost vs 20W but it will be very very negligeable.
If you buy a power adapter only for iPhone 12, go for 20W. If you can take advantage of the extra 10W for other devices, then consider a 30W to have a more versatile power adapter.