Re: Server room, DC power supply?
From: Robert E A Harvey (robertharvey_at_my-deja.com)
Date: 08/28/04
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Date: 27 Aug 2004 17:03:52 -0700
ac25kV@yahoo.com (Nexus7) wrote in message news:<b6d06883.0408241454.4dc2416c@posting.google.com>...
> I was thinking of building some servers - file server, email server, some
> compute boxes, etc. as an upgrade to some existing hardware. It looks like
> it is significantly more expensive to get redundant power supplies, so I
> was wondering if I can use some DC-DC power supplies in the servers,
> running off say, 24V or telecom 48V, or such. I haven't been able to find
> much on the web in the way of hardware I need for this. How do I get
> the power to the machines... does anybody make units with DC outputs with
> a battery backup?
I've installed computers on ships that run off the 24V DC system -
it's fully battery backed and runs all the emergency systems. There
are loads of suppliers of DC input ATX power supplies - e.g.
PS-250/D24 from http://www.impulse-corp.co.uk or IPS-B2U-6150F from
http://www.steatite.co.uk/psus.html . http://www.marinecomputing.com
has a range of solutions. It's worth talking to sales@hamiltone.co.uk
Biggest snag is that the 24V supply on ships is not earthed - it
floats, so that an earth fault can be survived. There are alarms and
detectors for earth faults. So the supplies have to be galvanically
isolated - it's no good if the 0V from the motherboard - which is
earthed - is connectd through to the DC input. I think all of the
ones I describe are isolated. For the LCD screens, however, I had to
buy big DC-DC converters from Lambda or Farnell.
http://www.boser.co.uk do the BPW-830C PS/2 300W 24V DC ATX Power
Supply, but as far as I know it is not galvanically isolated.
Similarly the ACE R20 Series redundant psus from
http://www.wordsworth.co.uk. There is ace one with battery backup, in
a height suitable for a server.
At one time APC sold 240V input AT power supplies with a small lead
acid battery good for about 10 minutes - never seen one since the
introduction of ATX.
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