What settings do you have on your overclocked S7's?

people will want to know if you will do escrow. 

I think you are missing out on the reason for the PDU.  If you had a wall plug for each psu (with proper voltage and amps) you would not need a PDU.  This is more common in say 110-120 volt.   But a PDU allows you to take one big power source (via the outlet) and distribute it to many item's.   For example say you have 240 30 amp running to your miner's most likely you will need a PDU to take it from the outlet to your PSU's.

It's more about being a necessity in some setup's then the cost aspect.  But you could save money running 1 wire to it vs many lower volt/amp wires (but this could very).

I suggest reading post before:

It sounds like you are good to go for your current setup! The only reason you would need a PDU is if you want more miners and you dont have enough space in your main electrical panel to wire in another plug. Is that making a little bit more sense?

so  you want to do

30 amp
fuse  in box..................plug in wall..........plug in wall........... plug in wall......... plug in wall...........plug in wall.......plug in wall


correct?  so 3x 2 plug  receptacles  are 38 bucks

6 special power cables are 90 bucks  that is 128 dollars.

you need 3 wallplates and 3 boxes for the walls as I for one would not put all into a 3 gang box.  so 10 -15 more.

so 153 in parts.  no extra fuse protection offered by the pdu.

but i do not know full code for your area.



I am usa based    so   code for above  is this receptacle  wait for link

https://www.amazon.com/Leviton-5822-W-Receptacle-Commercial-Grounding/dp/B000U3I1S0

now see photo  below  12.72 for one  which does 2 plugs

if you do a 30 amp fuse at the box  and buy 3 of these  you could do 5 s-9's   at full speed   or 6 s-9's with a down clock.


https://www.amazon.com/NEMA-6-20P-C13-Power-Cord/dp/B004WJNVH4/ref=sr_1_1?



http://i.imgur.com/VFftnsR.png


http://i.imgur.com/ZyNZhmX.png

1. The power usage is based off of the power usage in lab conditions running their 93%-efficient APW3 PSU. Now, assuming you don't use those, you're going to get a small bit more power usage due to the fact that most psus are not as efficient, though some do come close and beat the AWP3.

2. Difficulty is not easily calculated, and it will occasionally drop like it is now, or rise just a smidge like it did for a while. Assuming you buy right now and it gets delivered right this moment(which is impossible), you'll be off to a good start with the lower difficulty that will come the next difficulty correction period.

3. S7s are generally cooler and more reliable than S9s imo, but really it's up to you which one to buy. S7s have held their own for quite some time and have had lots of users, while the S9 is slightly less documented than the S7. it's your pick.

4. Generally, I use old miners until they make less than 3.5$ a day. With your cheap electricity, you may want to sell a bit earlier, as your electrical costs are comparable to some chinese miners and people with nearly free electricity. This means you may want to sell early, so that buyers are more inclined to buy the miner; they'll make at least a bit of profit.

The PSU end of the power cord is a standard IEC-13 connector. The wall end.... depends on what country you are in. There are a lot of flavors for the >200v plugs.

To be honest, there's good and there's good enough.  In my eyes, mining is still a business, so keeping costs in check is important.  Why pay $300 for a PSU when $120 for Bitmain's (or $85 in the case of my IBM 2880W PSU's) will do the same job adequately and reliably? The more you spend on PSU's, the less you are able to spend on miners, plain and simple. Anyone that tells you otherwise either has constraints limiting their choices (<200V AC input or require SATA/ATX plugs for motherboard), has made a hobby of it and wants to show off their bling, or are delusional. The only other factor to take into consideration is PSU efficiency, and if at your given electricity rate the extra cost for a more efficient PSU is worthwhile in the longrun.

The wall end also can depend a lot also worth mentioning a lot will change based on what PDU you use (assuming you use one).  Not all PDU's use the same connector going into them so it's worth looking at when buying a PDU.   I personally have PDUs between miners and wall in all 240 connection's I have.   

It is worth noting you can find some decent to great deals on PDU's on ebay from time to time.  I owe phil for one he told me about once.   But if your ever in market for PDU check ebay a lot as it tends to change on what is best deal.

much better is to make a shallow frame from scrap wood, line the back with screen, pack rock wool or fiberglass in the frame, cover front with screen. or, use fabric instead of screen, depends on how pretty you want em.

instant sound absorbing panels. slap em everywhere around the machines. dont need 100% coverage, even 25 - 50% will drop dbs.

If your not living at one of the poles you'll get a lot of heat from the miners in the summer and you want to dissipate this.
So you have to include some cooling or ventilation method in your calculation, otherwise your miners will have a lot of downtime.

In the past, years ago, the rule of thumb was to mine for 3 months and then sell the miners and use the proceeds to buy new miners, rinse and repeat. I do not think the rule is up to date any more, you would have to mine longer to offset the rise in diff, halved block reward, absurdly high miner cost, etc.