Quote Originally Posted by f.larsen View Post
Your amperage choice might be a little high, not sure what board your using though make sure you check the specs first so that you know it can handle that much. More than adequate cooling would be needed as well.
There's no "max" for amperage. I mean, if the device require 500mAh, he will take only 500mAh from the 30A.

The only problem with too much amp, is if you short something or if there's a design flaw, diode might not be able to "catch" the power and will blow.