will fast chargeing at 30 watts harm my ipad?

Your iPad will only charge as fast as its design allows. Plugging it into a higher-amp charger won't speed it up and probably won't do any harm.
 
Only the most recent iPad models will charge at 18 watts or above using a USB-C connection, if your copy is older and/or uses a standard USB cable it'll charge at 12 watts or below.

The rate of charge doesn't hurt the battery, only the number of charge cycles over time.
 
ty you both . it is drawing around 40 watts and charges fully in like 2 hours 15 minutes. it is the ipad air 3
 
Top