Simple answer is yes.   Wire guage is based on current.  By switching the circuit to 240V you effectively double the wattage of the circuit.   Remember in many cases there are multiple outlets on the same branch circuit so you want to make sure you change all the outlets (or at least mark them it wouldn't be code but it would keep you from doing something stupid).

You will need to rewire the branch at the breaker panel.  In the US a 120V circuit is wired neutral, hot, and ground.  240V is two hots and ground (no neutral).  

So
120V 15A circuit = 1800W * 80% (derate for continual load) = 1440W usable.
240V 15A circuit = 3600W * 80% (derate for continual load) = 2880W usable.
Same wire double the power.

Pools are no more concentrated than they were two years ago.  If anything they are marginally less concentrated and a significantly higher solo %.

kWh is a measure of energy (power over time).
kW is a measure of power.

1 kW for 1 hour = 1 kWh


10 PH/s farm
0.9 J/GH * 10,000,000 GH/s = 9,000,000 J/s = 9,000,000 W = 9,000 kW

So yes 9,000 but it is kW not kWh.  Now if you ran your 9,000 kW farm for 1 hour it would use 9,000 kWh of energy.  
In a year that 9,000 kW farm would use 9,000 * 24 * 365 = 788 million kWh.  At $0.10 per kWh that would be $78.8 million in energy cost.

If the Joule conversion confuses you 0.9 J/GH = 0.9 W/GH/s but that looks ugly.

If you can hold direct you probably wouldn't.  For many though (likely not people reading this) the ability to buy BTC as easily any other stock or ETF is attractive.  I am sure the fund will come up with a way to transparently show they have 1BTC for every x shares issued.   The funds ability to attract investors and thus fees depends on it.

So which is it units or GH/s?  
If units then excluding ASICMiner is nonsense.  I mean why not units smaller than 175 GH/s and BFL will have shipped 0.  Looking at all shipped units you are incorrect.

If it is GH/s then 3,000 KNC units is more than a PH/s.  There is no way you have shipped a magnitude more hashpower than all vendors.  So looking at hashpower you are incorrect.

Either way you are incorrect.

You do know that is not even possible.   
Bitfury pool is >0.5 PH/s.   Total delivered unknown but obviously >0.5 PH/s.
KNC has delivered ~3000 units or ~1 PH/s.   
Total network hashrate is ~3 PH/s. 

So even if the entire network consisted of nothing more than BFL + Bitfury + KNC = 3 PH/s it is no longer possible for you to have delivered more than all other vendors combined  and certainly not a magnitude (10x) more.

It is very likely you won't need heatsinks using bitfury chips.  Which is a good thing given the number of chips needed for 1 TH.  FC-72 has a critical heat flux under normal conditions (no flow, no subcooling, flat surface, normal pressure) of ~ 15 W/cm2.  Beyond 15 W/cm2 you get boiling failure and the wall superheat (difference between fluid temp and device temp skyrockets).  Under the critical heat flux the wall super heat is <10 C.

Bitfury (overclocked) ~1 W/GH (chip only).  
Package dimensions 0.7cm x 0.7 cm
1/(0.7*0.7) = 2.04 W/cm2.
Bitfury Heat Flux: ~ 2 W/cm2  < FC-72 Critical Heat Flux: ~ 15W/cm2
No issues having proper boiling without heatsink.

The disadvantage of using Bitfury chips is the low "GH density".   PCB size = 12cm x 12cm ?  If boards are spaced 1cm apart = 144cm3.  42 GH per board.  0.29 GH/cm3 or 3.4 CC/GH.   Fluorinert runs about $0.80 per CC ($80 per Liter), thus at 3.4 CC of fluid per GH the fluid cost is $2.72 per GH which is pretty high.  The higher the GH density the less fluid needed per unit of hashpower and the more economical the system.  My goal would be to get fluid costs to <$0.25 per GH and full system cost (excluding SHA-2 boards) <$0.50 per GH.

I doubt they have "shares" but take a look at the auction thread.  BFL spend 10+ BTC per slot for 4 to 6 slots per week every week.
Say 50 BTC per week or 2,500 BTC per year.   I guess 2,500 BTC buys you immunity.

Actually unless they didn't ship anything on 10/14 it is probably closer to 3000.

10/24 -
10/23 - "with good day ~400 units?" should be finished
10/22 - ?? "600 boxes shipped in last few days"
10/21 - ??
10/18 - ??
10/17 - 280 boxes shipped
10/16 - 455 boxes shipped
10/15 - 350 boxes shipped
10/14 - ??
10/11 - 700 product total since start

So the "600" probably refers to 18th, 21st, and 2nd.  That leaves 10/14 as a unknown so unless nothing shipped we can guestimate it was probably 200-400 more units.

So 700 + 300 + 350 + 455 + 280 + 600 (3 days) + 400 (one final good day) = ~3085.  I will round to 3000 units. 
Assuming 350 GH per avg unit (mix of Jupiter, Saturn, Mercury) that 1 PH/s.

Thanks Puppet.

Bitcoin doesn't work on the concept of "funded".  A tx consists of specific inputs which are prior tx outputs.   

If the inputs are invalid or already spent the tx will be dropped by the first nodes it is sent to. You can't later fund the "address" because Bitcoin doesn't work on the concept of an address having x BTC worth of "funds".  Sending funds to the address would create a brand new input, one not referenced by your prior invalid tx.

Simple version:
Invalid tx are simply dropped. 
Unconfirmed =/= invalid it just means not included in a block.

Use 240V.  No seriously for any serious miner you likely should consider a dedicate branch and if you are going to do that look into 240V.  NEMA L6-30R outlet.  Good for 5.76 KW.  As an added bonus ATX power supplies tend to be 1% to 2% more efficient at 240V vs 120V. 

Can you provide a link?  Hmm.  I don't have a link handy but in KNC thread I do recall them indicating ~500 shipped with ~1000 to go.  Maybe that was orders not units.  If the first batch was indeed 2700 units the hashrate should be updated (nearly double).

I had started this thread/FAQ but got busy I will hopefully fill in more details this evening. 
https://bitcointalk.org/index.php?topic=313087.0

I don't know if I will ever sell a kit, hell I don't even know if it will live up to the promise at this point.   It won't be oil (although that is an option),  I am looking at Fluorinert (probably FC-72) made by 3M.  My interest in HashFast's, is that of all the ASIC designs, the HashFast modules have the highest density when looking at the hashrate and board size (~1.7 GH/cm2).   That is important to minimize the amount of immersion fluid necessary.  The other reason is that since they use USB for data connection it makes customizing easier.

Anything can be immersion cooled by at least based on specs HashFast design is near optimal based on designs we have seen so far.

Well if 0.55 J/GH is the chip power consumption throw in another 10% loss for DC regulators (so another 110W or so).   ATX power supply is 12V.  No ASIC runs at 12V so all ASICs have converters to drop the 12V down to ~1V used by the chip.   Nothing is 100% efficient, 90% efficiency is a good place to start.

The ball is in HashFast's court.  They seem pretty well run and I think they know the market is watching (and thus their ability to secure future sales).   Lets see what they do.

Depends on what you mean by considerable.  My estimate for the prototype immersion tank is $1,500 to $2,000 (excluding ASICs) and it should be capable of cooling 4TH/s to 8TH/s of hardware.  The actual capacity will depend on a lot of factors primary ASIC board size.

As for "needs"?  Sometimes people just do things to see if they can.  In theory with immersion cooling your ASICs could provide year round hot water and heating in the winter "for free".  What heat you can't use can be cheaply dumped outside.   The fact that is can be done in a smaller space, and with noise is an added advantage.   To take full advantage of the capabilities I will need one or more vendors to sell "naked modules" (no cooling, power, cases, heatsinks, etc) at a reasonable cost.  The initial purchases are just for evaluation.


No but it was a Nov order so I don't expect it before Nov 15th.

I should have known the British would fuck up my example.

Exceptions to every rule but generally currency units are plural.  
1 dollar,  15 dollars
1 euro, 15 euros
1 ruble, 15 rubles
1 bitcoin, 15 bitcoins
1 milliBitcoin, 15 milliBitcoins

Um the plural usage is right there in your quote.


Do you also say I won five hundred dollar or man prices in the UK were expensive that [...] was 10 pound.

It is units of currency thus it is plural.   The only time the units of currency is singular is when it is one unit.

That will be one dollar.
That will be one bitcoin.

That will be two dollars
That will be two bitcoins.

What makes you think they will be days apart.

"late Dec" is planning to ship 31 DEC but that will become early Jan unless there is a significant delay.   
"Jan" means by Jan 31st which depending on how bad "Dec" slips could be Feb.

Water moves.   Condense on cooler metal parts and drip, flow, puddle to the hotter actively electrical ones.   Cooling below dewpoint is generally not a good idea.   


As for what to use.   You need something which can move a lot more heat.  1 ton AC = 12,000 BTU ~= 3KW.   A window AC in a insulated box would work.  Just don't try cooling below dew point.  However at some point using chilled water cooling starts to make more sense.  The HF modules are already designed to be fitted with a waterblock.