Well, I do understand the feeling about Bitmain. I'm a small miner...when I'm maxed out on power, I'll be running a little over 16Th. I just ordered 2 S7s from Bitmain, Batch 16 (one fan). I would have preferred to go with Avalon, but logistically it didn't make sense in my specific situation. They cost twice as much (as what I had to pay Bitmain with a coupon), and produce a full Th less than the S7; yes, it's on 1050 watts v. 1300w, but even 1050w basically takes a full 20A 120v circuit, unless you piggyback two S3s to get another .9Th. So...,you've got 4.6Th from the circuit. With an S7, you can run one S3 with it, and get around 5.1Th. Those were the factors I had to look at, since I've got just four 20A circuits to work with. When Avalon is able to put out a unit that is just a bit heftier, and it made economic sense (or an S7 bites the dust), I'll move over.
well 1000 watts @ 120 volts is 9 amps,also Bitmain specs for the S7 any batch is for an ambient temp of 25 degrees C. that is a hard target to meet anywhere south of the mason-nixon lineEdit: that's 77 Fahrenheit
I'm on the far west end of Kau'ai Island in Hawai'i...21 N. I've had to make some adjustments on air circulation in the room, but I'm not using AC and don't anticipate having to. It's been up to 89F here w/the one S7 I have, but it maintains no more than 67C on any of the three boards. My complaint/displeasure is the noise level. The B9 S7 I run is incredibly noisy. Also...we have to manage a relatively unstable power grid here. A 20A circuit here is only good for about 2KW, because the line power hovers more toward 100v than where it's supposed to be. Two A6s would blow the breaker on surge.
Homes are built quite differently here than on the mainland. Any outside wall will generally be plastered with louver windows, or sliding glass doors w/screens, to catch the prevailing tradewinds. I "encourage" that circulation somewhat, but not with AC. I've been able to manage quite well, but it's a unique circumstance here.
EDIT: I use TrippLite 1800w line conditioners on each circuit, and they're constantly in the yellow or red. The gear is getting the right current, but the breaker is not caring. I have tried running a nominal 1800w (five S3s at 355w ea, 1775) and it will not hold for more than 20 sec. Yes, I could monkey with the breakers, but mgt would not like that methinks.
