@IITravel01,
1200W for 3 S3+ is a bit too high...
We have low efficient PSU and Kill-a-Watt showing 1087-1107W.
PM us your e-mail, someone from the company will send you a beta firmware for the S3 and S3+
Some are already floating around I think, but if you want the authentic version, PM us and will have someone e-mail it you.
@IITravel01,
It will consume 600W but it is depends on your PSU efficiency counts and if the PSU can take some overloading. 1300W PSU, sure there is not much overhead

is a 1300 watt PSU enough to run two S5's?
Yes it is, as long as its not a terrible brand.
is a 1300 watt PSU enough to run two S5's?
It should, but it's close to boarding on it not (only 10% headroom). I would think it's OK, but would keep on eye on the setup for a while before feeling comfortable leaving it unattended.
S5s are 590W at the wall with a ~85% PSU. That means 500 pre PSU. 1000/1300 = plenty of headroom.
The S3 specs. stated at the wall, but my meter on my power supply and my Kill-A-Watt showed that the readings were at the power supply. If the S5 is the same then not so much headroom.
And ambient temps and 110-240V.
I tried both 120v and 230v (with a step up voltage converter and a true sine wave UPS and a 240v Kill-A-Watt) with a Gold 1200w (showed 91% efficiency with 2 X S3+) and also used a Platinum 1600w power supply. You can check my earlier posts for more info. 3 x S3+ at default took about 1,200w at the wall (but is rated at 355w x3 = 1,065w).