2mw x .8 = 1.6 megawatts
Why did you multiple 2MW with 0.8? Does 0.8x used to consider PSU efficiency?
24/7/365 power use means you have to derate the power by a factor of .8
this is to prevent wires from melting.
So if he has 2000 kwatts or 2 megawatts in transformer rating x 80% gives the proper safety factor of 1600 kwatts or 1.6 mw
so 1600/3 = 533 s19 units doing 3 kwatts each.
As for proper staffing a lot depends on the op and his or her knowledge of mining.
500 units can be done on 2 routers each with 1 pc and 250 miners. this means 2 internet lines. which is a decent idea for redundancy.
500 x 100 = 50ph hash or
50000th hash
50000 x .071= 3550 usd a day.
as for fear of viabtc and referral misuse, here is my viabtc referral
https://www.viabtc.com/signup?refer=680499simply join viabtc with that referral and I get a piece of the fees viabtc is collecting. you the miner do not pay extra.
so obviously this means by working with 1 outsider you have a record of your miners since the outsider gets the hash rate number and th referral fee.
so at no cost to you you get a free check on your hashrate by some one you trust.
it does not have to be my referral .
So if he opens an account with 250 miners. doing 25ph from 1 router he can glance at his viabtc stats on his account and he can check with the person that has his referral to see if it matches.
To be honest. this gear needs very little hands on work.
depending on filters and your dirty air or clean air. Maybe a 60 to 120 day clean out schedule .
500 machines at 10 minutes a machine is 5000 minutes of work. that is 80-90 hours every 2-4 months.
10 minutes to check that gear is running say 4 times a day. is 40 minutes a day. 1200 minutes = 20 hours
then trouble shooting the bad gear. maybe 1 day a month = 8
so 100 hours a month of work is about right.
Of course access to a good repair guy = needed
fuzzy beat me to it as I wanted to address the fraud issue.