Quote from: allcoinminer on August 12, 2014, 05:32:25 PM

Quote from: cloverme on August 12, 2014, 04:02:34 PM

Quote from: allcoinminer on August 10, 2014, 08:19:36 AM

AllCoinMiner's Power Supply Sizing Guide

This will guide you through the process of sizing a correct power supply as per the requirement of your device.
Here we will take Antminer S3 as a reference device but this is applicable for any DC device.
A little bit of over sizing or margin is considered in the sizing for safety or regulatory reasons.

Step 01: Note down the maximum rated power consumption from the dc device or mining hardware. In the case of Antminer S3 it 340Watts.

Step 02: Add a safety margin of 20% to 25% in to the maximum power consumption. So 340W will become 425W.

Step 03: Now coming to the power supply, you need 425W from it. Do not rush to a power supply that just gives 425W.
   First you should go to its specifications and look for +12V Rails.
   Normally power supplies have a single +12V rails but some have upto 6 +12V Rails.
   So, look at a single +12V rails and check how much power it gives.
   Come manufacturers specify it in Amps an some in Watts.
   So if its specified as Watts make sure its above 425W.
   If its specified in Amps its should be rated at 35A in a single +12 rail. This 35A is we got by 425W/12V.

Step 04: Since we are running the hardware 24hrs every day, the efficiency of the power supply matters.
   I will not recommend going for a power supply which rated for below 80% efficiency.
   So select one giving at least 80% to 85% or above efficiency. The calculations are same for all.

Step 05: Now we got a psu for running a single S3. If you want to connect more than one DC Device, just add all the devices power consumption and do the Step 03.
   Even though Single +12V Rails is recommended, if your power supply have two +12V rails you can run two devices if each +12 rail is giving what is
   enough for the single device.

Hmmmm I think you might be going at this the wrong way as far as a guide is concerned. Most of the newbies that post here for power supply questions want to know the exact make/model of power supply they need for the quantity of miners they are buying. You might want to develop a table (although I could swear someone already did it, maybe Dogie?) for it with the number of miners that single power supply can support based on actual use and not theory. So, if someone buys 5 antminer S3's, the table should tell them which model of power supply they need and what quantity based on the highest efficiency and most "bang for the buck" as it were. A bonus would be how many power supplies the casual home miner can run before popping his 15A/20A/30A breaker.

No I have no intention to do that.
I love to teach how to caught a fish rather than giving them fish.

I agree completely with this, especially because dogie already did that. This guide very clearly spells out how to calculate all these things in one concise place. If they want the chart that cloverme suggests, they can just go to dogie's guide.