Official site, says PSUs are 1200 and nominal power 2500.
Not a sigle 2700W in the blog or product description.
Because it wasn't published on their website, but it was stated by Guy here on the forum.
Not on the website, but public enough .. I'm pretty sure I'm not the only one having access to this ...
EDIT: here's the UL certification .. focus on DS1200-3-002. On the 2nd page .. 200V to 240V @ 7A = 1400W min to 1680W max .. on average 1500W.
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http://www.artesyn.com/power/assets/ds1200-3_-002_-005_ul_1333541790_cert.pdf