When I bought a miner locally, a seller wanted to give it to me for free and I even refused having free electricity.
Why would you refused if you have free electricity. Hook a bunch up and run them untill they get you enough for a s3 or s5. I wish some one would give me a bunch of s1 for free LOL I have free power.
I didn't take it because I was low on power supplies at the time and it wouldn't be worth it buying a PSU just to power them up.
You would need at least 1 600-800W PSU just to power one of them.
I am not sure what you a referring to. 350W will power a unit just fine.
Most 350W PSUs only have 1 PCIe connector. You would need at least a 600W with 2.