[Veering off-topic; mods, I'll not continue this branch of the thread much
longer....]
On Friday 14 September 2007, John R Pierce wrote:
> I've gotten away with running some 208V equipment on a 120V UPS using a
> step-up transformer which had a 208V tap (and 220V, 240V). Of course,
> 3000VA is going to require a 120V 30A outlet to power said transformer
> (and a UPS with 30A output probably needs a 50A circuit to feed it).
Input power not a problem; we have a 125KVA Leibert PDU for the server room
(about 4,000 square feet raised floor with 30 tons of A/C (Leibert System 3
15 ton x2)). There are a few L21-30R's, L5-30R's, and L6-30R's under the
floor.
> (googles, oh. 12V 75AH
> monsters, online looks like $125 each).
>
> I'd put said batteries in a
> series of battery boxes, and install the whole mess some place like the
> basement, with ventilation to prevent accumulation of hydrogen fumes.
You've just described the way our 48VDC system is connected, with the
exception of the type of battery...we have a bank of 24 C&D KCT-450's for
48VDC, with two Lorain RHM200D50's floating them (cells and rectifiers were
donated to us). The cells are in an old munitions building that was on-site
(please don't ask; look up our history on www.pari.edu....:-)) that we moved
from the pistol range to the back of the main building, and ran four
2/0 'jumpers' to.
But if someone wanted to support an educational institution and wanted to
lease floor space and/or bandwidth (we currently have 100Mb/s to the
Internet, and an OC3 to our co-lo in Asheville (also our ISP's PoP; see
www.ercbroadband.org) (which is part of the reason my equipment budget is so
lean!)), we would love to talk. Perhaps even for CentOS mirroring and/or
building.
Peter Arremann visited us a while back (by the way, Peter: good article in LJ,
and thanks again for the UltraSPARC goodies!); he could fill you in on how it
was when he visited.
--
Lamar Owen
Chief Information Officer
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC 28772
(828)862-5554
www.pari.edu
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