root/admin, its a beaglebone like the S2/S4

Please do, when you can.

There's very little humidity in the outside air here. There's as much actual moisture in the air at -20C and 90%RH as there is at 10C and 10% RH.

Unless of course you live where the humidity is typically <30% on average. Temps year average 12c. Hint... take a look at where all the new (google, facebook, etc) data centres/centers are located.

Or if you want to get really creative (and adventurous), wire 3 12V supplies in series similar to what the RC guys do, and then string together 4 S5s.

Edit: Don't actually do this. Things will blow up.

I dont think you can safely drive that much wattage through the S5 units like that. (if you wanted to try, you could run both blades of an S5 in series on 24V)

Yes but I live in the Pacific NW.  My bad for assuming these conditions are the norm.

15A circuit, 1300W PSU, 2 miners living in perfect harmony:

Ebony (Overclocked S5): 1240 GH/s
Ivory (Underclocked SP20): 1140 GH/s

Each miner is drawing 700 W (+/- 2%) at the wall.

for the S5 fans, try driving them at 5V if its cold intake, or 7V if you want to overclock. One of these http://www.moddiy.com/product_images/j/547/T1JRxJXglbXXce7cAT_011207__14471_zoom.jpg will work, or makeshift your own (its just a few watts). The PWM revving to 80-100% is terribly loud.

as for the SP20 - you should be able to drive it a bit higher, to 1200Gh or so, by setting each PCIe to 155W and the voltage range to 0.638-0.655. Should settle in around 1200GH/0.646V and draw about equal to the S1 (this is with fans way down, which might free up 5-10W)