My observation is that 48V DC power is very efficient in the sense that you're not converting from AC. However, 48V power distribution is extremely inefficient over long distances, even the distance to wire up a datacenter. And, if you're thinking about having a 48V PDU at the end of each row to convert AC to DC, you've lost money. The only way I think you would save any money is if your entire datacenter is wired for DC voltage from the start and everything you purchase has a straight DC power supply. In the end, you're still going to draw the equivalent amount of power whether it is AC or DC to power your servers.
I've seen the ROI numbers to convert a (small) 40-rack datacenter to DC and the break-even point was between 15-18 years. And, as everyone has pointed out, AC power supplies are becoming increasingly efficient, thus pushing that ROI even further into the future. --Scott On Feb 27, 2012, at 8:18 PM, Darrell Fuhriman wrote: >> utilizing less storage elements, and producing less waste. That is true. >> Or you can just design a smarter A2D power supply, which efficiently uses >> the 120V single phase power. > > > I continue to wonder why more data centers don't use -48V DC distribution. > > Darrell > _______________________________________________ > Tech mailing list > [email protected] > https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/
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