The power requirement was stated as being 2500W (it still is on the website). The input rating is specced at 90-264VAC. Clearly a 15A/120V circuit (2 of them) would be sufficient to run this device and people have made purchasing decisions based on this.
Now Spondoolies has announced that the power spec has changed to 3000W. It was never 3000W; it was 2500W up to this point. Two 15A/120V circuits are no longer sufficient to run it; they cannot sustain 3000W.
The power supplies they announced that they'll use are Emerson and Murata. Emerson is 1500W max at the wall. Murata is a little over 1600W max at the wall. Since the units were designed with 2 power supplies, you do the math. If you pump the unit for its maximum hashrate, you should expect maximum consumption. That is, if the unit is designed properly.
My understanding of the product is changing too, since I've ordered it. I did not think initially that the whole SP30 design is _that_ good. Now I like them even more!
PS: I'm tired to post again the power supply specifications. Please scroll up 2-3 pages.