What is the max wattage (using a powerbank) which is supported by IPhone SE 2022 model?

iPhone SE 3rd generation(2022) supports up to 20W charging via Power Delivery. To use it fully you need a MFI certified USB Type-C to Lighting cable and power adapter(power bank) which will support PD 20W. Often on power bank you can find only Voltage and Amperage. It should be something like 9V 2A, 12V 1.5A or little higher.

Watt  is like how fast your car can drive, but the speed limit is how fast your car do drive

the iphone draw as much current as it was build to use when charging, the fact that

a charger can provide a lot more just means it's not having its full capacitive used

so the higher the watt the longer the powerbank is able to work