----- Original Message ----- > From: "Jima" <[email protected]> > > On 12/3/2010 9:25 PM, Matthew Petach wrote: > > (OK, so it's not as practical when you have other customers to worry > > about... but it might not be so crazy when you're looking at the > > efficiency numbers for 100,000 small 1u power supplies vs a set > > of much larger ones.) > > Particularly if you're running your AC power through UPSes -- > especially online ones (where there's a constant AC-DC-AC conversion > happening). Go to DC for the batteries, never come back. It's a > tempting notion.
And in fact, much carrier class equipment can be had with -48V power, there are ATX and similar power supplies for PCs that are -48, and I *think* I've commercial small UPSs (<3kVa) that give with -48 as well... using 48V battery strings, obviously. Cheers, -- jra
