Thanks guys.

I assume in the case of the "wrong" PSU failure my S9s might be damaged?

Stuck on 120V here, looking for powering solutions.

The APW3++ gives 1200W.  Any reason I can't power two hashcards on one S9 from one, another two on the other S9 from a second, and both remaining cards (one one each S9) plus the two controllers from a third?

Powerwise it works.  Any gotchas I haven't considered?

Surely the bulk of the network is the 5c/kWh chinese miners?  Why would they use anything apart from S9s?

Do 1200W versions exist?

PS, I assume this recommendation from parellelminer for the x11 is also a bad idea?

http://i66.tinypic.com/2igehk7.jpg

My bad.  S9.  Is there any more efficient currently?

BTC at usd 1k pays the power costs at 5c/kWh and current difficulty [on an S9].  I wouldn't expect to see any significant slowdown in mining until we get near those levels.

Hi @fanatic26.

Slightly confused.  Are you saying that you /agree/ that using a DPS1200 like this is a bad idea? 

Looks like the DPS 1200 is only specd for 75A@12V on 110-120V, ie 900W

a 14TH/s S9 takes 1400W. 

So if we're using one PSU for two hash boards isn't it running right at, or even slightly over spec? 

Thanks kagami.  Is that the only one?

I only know what it says at

http://whattomine.com/asic?utf8=%E2%9C%93&sha256f=true&factor%5Bsha256_hr%5D=14000.0&factor%5Bsha256_p%5D=1370.0&factor%5Bscrypt_hash_rate%5D=500.0&factor%5Bscrypt_power%5D=800.0&factor%5Bx11_hr%5D=15000.0&factor%5Bx11_p%5D=1200.0&factor%5Bqk_hr%5D=450.0&factor%5Bqk_p%5D=75.0&factor%5Bqb_hr%5D=450.0&factor%5Bqb_p%5D=84.0&factor%5Bcost%5D=0.15&sort=Profitability24&volume=0&revenue=24h&factor%5Bexchanges%5D%5B%5D=&factor%5Bexchanges%5D%5B%5D=abucoins&factor%5Bexchanges%5D%5B%5D=bitfinex&factor%5Bexchanges%5D%5B%5D=bittrex&factor%5Bexchanges%5D%5B%5D=bleutrade&factor%5Bexchanges%5D%5B%5D=cryptopia&factor%5Bexchanges%5D%5B%5D=hitbtc&factor%5Bexchanges%5D%5B%5D=poloniex&factor%5Bexchanges%5D%5B%5D=yobit&dataset=&commit=Calculate

Came across UNIT on wtm a few days back as giving the highest payout of all the sha256 coins.

Having trouble finding an up to date list of pools for it though.

Anyone here know of one?

Not here I can't: Only single 120V to the property.

Fair enuf!

I've only got a dedicated 120V/60A/8kW circuit here so need to make do with that.  If I ever need more than 8kW/60A I'll get them to quote for 240V as well.

Why a 20A circuit?  The S9 14TH/s model is rated at just under 1400W at the wall, ie about 12A.  I was going to wire each into its own 15A breaker with 8 AWG. With either an individual or group RCCB/RCD.

I'm very nervous about the multi PSU idea, seems a PSU failure could kill the S9?

Parallel Miner looks interesting, thanks!  Seem to open up a whole new bunch of PSUs to use.

I'd be nervous about running it on fumes, though in truth it would probably be ok. 

Can't you just put it in a cooler with warm air to start up, and use the exhaust to warm the space?  Or even redirect part into the the cooler?

Is there a FAQ anywhere for recommended PSUs for an S9 running on 120V?

I've found a couple of (expensive) 1600W PSUs on newegg/amazon, and used IBM DPS 2000W on ebay.  Anything else?

Subscribe to their twitter feed, they usually release a new batch every week or so.

Don't buy from the resellers, they'll eat your profit. 

Run the numbers first: https://docs.google.com/spreadsheets/d/1An4pJrmcO3GbgOS9fWOHtz93syuOrCo7zLJtxmtZiTY/edit?usp=sharing

Not a silly question.

I can't speak to the S9, but standard PC components (non-MILspec) are not speced for very low temperatures.  There's also the issue of any dampness on the board freezing and causing physical damage. We had to get some heating for a server exposed to a CT winter.

I think I would want to heat it the room slowly before I started it up, then check the exhaust was maintaining the correct working temperature in the space.