The power consumption at the wall will be ~2500 Watt.

For the SP30, we'll use two 1200 Watt PSUs. We're evaluating:

Emerson              P/N DS1200-3-002
http://www.artesyn.com/power/power-supplies/websheet/401/DS1200
 
 
Murata                 P/N D1U3CS-W-1200-12-HA4C
http://www.murata-ps.com/en/products/ac-dc-power-supplies/1u-front-end/d1u4-w-1200-12-ha1c-6.html

ASIC Power Performance is 0.35 Watt / GH/s

AC2DC derating is ~0.92

DC2DC derating is ~0.85

Fans will consume ~60 Watt

(2500 - 60) * 0.92 * 0.85 / 0.35 = ~5.45 TH/s

The spec of the SP30 is 5.4 TH/s +- 10%