another newbie posting...similar scenario, I was thinking of getting 10 x S3s, however I do have free power and air con (perk of the job).
How in the heck do you have free electricity, and don't tell me you work in IT and have access to a datacenter room!
In some parts, that's called stealing, but let's say you're "borrowing" 3400 Watts for these 10 S3's. Hopefully, your job burns through so much electrical costs that those 3400 Watts you'll be using 24/7 will be peanuts.