Choosing a controller?

[alonstar]

Hey,
if my battery has 30A current, 48v 20ah, and my motor is sensorless brushless 500W, which controller do i need?
shouldve taken the 25 or 30a controllers?
(by my stupidity i already ordered, a 48v 22A KT controller. i really hope it is good, or i just downgraded my system?)

Thanks everyone for replying!

 

[99t4]

(by my stupidity i already ordered, a 48v 22A KT controller. i really hope it is good, or i just downgraded my system?)

What was the amperage rating of the previous controller?