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Date: Mon, 18 Dec 1995 19:47:45 -0500
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From: "Daniel J. McCoy" <dan@acti.com>
To: Multiple recipients of list <lightwave@garcia.com>
Subject: Re: Lasers with Lens Flar
X-Listprocessor-Version: 6.0c -- ListProcessor by Anastasios Kotsikonas
Status: RO
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At 04:37 AM 12/18/95 -0500, you wrote:
>Just check the label on the back of each piece of equipment to determine
>the number of Watts. Add up all the watts and multiply by the number of
>hours. That gives you watt-hours so divide by 1000 to get kilowatt-hours.
>Multiply kilowatt-hours by the rate you pay ($/kw-h) and you have it!
Warning... Do NOT use the WATTS value specified on your power supply as a
basis of how much it is consuming. That value is typically the MAXIMUM
amount rather than an actual ammount. A couple years back, a UPS
manufacturer (BEST) sent me an information packet on their products and how
to convert WATTs to VA (volts per ampere) that UPS manufacturers also use.
It gave you a worksheet to calculate the UPS that would suit your needs. At
the time, I had an Amiga 3000 w/ 200W power supply, a SCSI sub-system with a
200W power supply and an monitor. Doing the conversion to VA and then
adding 'em all up and adding a fudge-factor for future growth, I ended up
with a 1.3KVA UPS! When that 66 pound beastie came in, I plugged everything
in and checked the UPS load... 25% load on 1.3KVA with 70 minutes of backup
time! HOLY MOLY! And that is WITH the monitor ON! NOW I only have a PC
hooked up to it with a 270W+ power supply and it only puts a 5% load on the
UPS with a run-time of >99 minutes (only two digit LED display :) ). Turn
the monitor on and it's 15-20%. :) Obviously, I overbought by a LONG shot!
I would have returned it if it weren't 66 pounds! B^)
But the beast came in handy during that earthquake So. CA had in '94. My
computer was happily rendering an animation 30 minutes after we lost power.
Plus, I had it supplying power to a radio tuned to the news. Once I turned
the computer off, I probably could have ran the radio for hours... :)
At any rate, the actual power consumption will always be lower than the
value specified on the power supply.
Dan
(Who should have KNOWN better!)
--
Daniel J. McCoy - djmccoy@westworld.com or dan@acti.com
