From: Notari, Ed (NotariE@usa.redcross.org)
Date: Mon Oct 14 2002 - 08:42:30 EDT
Many thanks to those who responded...
Two main resources for this answer are as follows
1) From the HP/COMPAQ web site (Not there are not a lot of ALPHA solutions
available in this tool.)
2) The APC web site interactive "sizing" application (Also not a lot of
ALPHA solutions.)
http://www.apc.com/template/size/apc/
Here are the responses, some elegant, some humorous, all helpful;
=========================================================
Hello Ed,
I typically just go to APC's site and use their selector. Here is the
link... http://www.apc.com/template/size/apc/
Good luck.
Brandon
=========================================================
Ed,
I hope this em-powers you (pun intended :-)
Find all the power cords and then the fuses for them.
Add up the total number of amps of all of the fuses (generally most computer
systems have 2.5 Amps fuses but hey coudl be smaller or
larger).
The formula for power is
P = I * V
Power equals Current (in Amps) times Voltage (in volts).
Say you had four fuses at 2.5 amps each, times 120 volts
120 * 10 = 1200 watts of power consumption.
You need a 1200 watt (or Volt-Amp as they call them :) UPS.
This will give you the minimum required up-time.
Caveat. You need to decide how long you want all of this to run for and ramp
up the watts/volt-Amps accordingly. Most UPS Vendors have nice charts ffor
calculating this.
Call you local utility and ask them for the last years outage times for your
locale.
Assuming money is no object :(
Then decide how much longer you want the UPS to keep these systems online
and acquire that amount of wattage of UPS. Alternatively, donw-size it to
what you can reasonably afford.
Pete
=========================================================
Ed,
I'd recommend you work with your HP/Compaq sales team. Compaq was/is a big
reseller of Powerware and they can provide exact part numbers that you would
need. There are a variety of power distribution panels that are specific to
the A/C cords on the systems/racks.
If you're looking around on HP/Compaq's web site, look for any links to
"environmental" products -- you might also try APC (APCC.com) and see if
any of their sizing tools include Compaq Alphaservers.
For us, we purchased a Powerware UPS through Compaq for our two ES40
systems. There are even Compaq(DEC) part numbers that are specified in the
order process.
Robert
=========================================================
my A/S2100 power supplies are basically 600w each.
OK. Here is a good page:
http://www.kalglo.com/watt.htm
to help figure out how much of a UPS you need.
>From what I'm seeing a 2200kva - 3000kva should be good
for about 10 minutes of downtime.
George
=========================================================
Good luck,
Ed Notari
Senior Research Associate
Transmissible Diseases Department
Jerome H. Holland Laboratory
American Red Cross
(301) 738-0646 /FAX (301) 738-0495
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