Wrong..
You obviously know shit about actual mining and are not speaking from experience.
Each S9 eats +1400W @ 220V that is about 6.3 Amps EACH...with line losses and in hot weather that can spike up to 6.5 EACH.
(You CAN'T feed the PSU's 600V only 110V (which would then draw 13!!! amps) or 220V)
So 30 units would draw 30 x 6.5=195Amps
I tried running 31.....guess what happened...
I've tripped and replaced my 200amp breaker twice already and even had my service entrance melt and EXPLODE and cause a fire.
https://bitcointalk.org/index.php?topic=4999843.028 units WAS (as in actually done & experienced for 6 months) the max sustainable BUT was WAY OVER the 80% load rule.