Personally, if I were building a cut-rate datacenter with used/unreliable power equipment? I'd build two parallel power systems to each rack. Each customer would get two independent power feeds (and stern warnings to not use more than 80% of one circuit total) (I mean, while new kit is super expensive, used power conditioning equipment can be had on the cheap if you are in the right place at the right time.)
Then, so long as customer buys dual PSU equpment (or their own small ATS, and I've had better luck with 20a automatic transfers switches) they'd be fine.
Of course, I've never gotten the chance to try, (well, I did kind of have a chance once, but I kind of blew it for non-technical reasons before I got to build out a power system of my liking.) so maybe I'm missing something. Maybe the electrician work is more expensive than I think or something.
I'm a little surprised that anyone with any scale still uses he.net for physical hosting; Last time I tried to negotiate with them, at my scale (20kw) they essentially charged $400 for every 1.4kw, (and they gave you a rack with that 1.4kw) which is kindof a terrible deal compared to higher density co-location providers like coresite or BAIS, where your racks are closer to 5kw each, but that rack usually comes closer to $1300 or so.
(Most rackmount servers are power-dense enough to eat 5Kw of power in 42u, with some space over)
This means that after your first few servers, the higher end datacenters are actually way cheaper.
I mean, don't get me wrong, I think he.net bandwidth is a great part of anyone's BGP mix, and I think that he.net hosting is the best deal around if you only have 1.4kw of power and want your own rack (often they will sell you your own rack, 1.44kw of power, and a nice unmetered gigE pipe for $500 a month, which is a killer deal for a rack and a gig. But it's kinda terrible if you are using serious amounts of power)
On the other hand, the he.net remote hands are... some of the best. I mean, they are remote hands and super junior people, with all the problems that come with that, (remote hands is, as far as I can tell, a junior sort of job many places I've seen.) but they are on site, on the ball, and every time I called in, they were right there, and it's free.
Last time I called coresite for remote hands, they said they would charge me $200/hr... reasonable, I suppose, for getting someone junior-ish out of bed, but they had to page the person, and their person still wasn't there two hours later when I was able to arrive.
I spent some time in the (I think now defunct) SVTIX co-lo at 250 stockton. It was super low-end, super shoestring, in some ways lower-end than he.net - but they had multiple power systems and would sell you a/b power if you wanted to pay enough for it. 250 stockton was certainly built out to higher standards than the he.net datacenters, though the he.net datacenters were better maintained.
(My favorite "my fault" power outage story was that I would give my friends co-lo access, right? And then I'd call them when I needed remote hands that knew what they were doing. Well, you know how cheap nerds are. One of my buddies shows up with one of those ancient PSUs that have a 110-220 votage switch. My rack was 208v. He had the switch on the 110 setting. It fried my PDU, the same avocent that everyone in the rack was on. The outage wasn't long; I had a spare in the office that was only a few minutes away. It was super annoying, 'cause I had earlier given the man a perfectly good 1u chassis that came with a modern 100-240v autoswitch psu... which he put in. This was his second computer; I would have been happy to give him another chassis/PSU. I was so mad. So mad!
I actually didn't see him for a while... the next time I saw him... I was at a party, telling this very story. He walks in right in the middle. I point and kinda shout 'It was him!" which, yeah. uh, I should not have done that.)
1) ID, rack hall, rack number, company name. 2) no id, name, etc. 3) no id, company name, "I think it was left?"
all worked fine.