I suggest doing a pencil mod on those s1s to undervolt them, if the seller hasn't already. It greatly improves efficiency, reduces noise, and requires less investment into PSUs. It'll slightly reduce your hashrate (from 180GH/s each to about 140), but its well worth it. Plus, its a fun project!
Guide:
https://www.youtube.com/watch?v=aqhB96fSh64You'll need a multimeter and a pencil to do it.
ALSO: Note that the person you are talking to is a newbie.
BE CAREFUL! Watch out, do not send btc upfront to him. Use a TRUSTED escrow agent (like ognasty or sebastianju), scams happen
very often in this forum!
Nothing personal to lunacy, just remember to be careful.