Yes it is a dedicated 20 amp circuit that had the killiwatt on it.  It was beeping from time to time as it was hitting the 15amp warning on the killiwatt.  Its no longer plugged in, I just wanted to check the draw from the cubes.

I have two cubes on a 15, another one on a different 15, and five plus the switch on the 20.

I am definitely keeping an eye on things, and thanks for the warning. 

-herener