Re: How much?

[chris@xxxxxxx (Chris Davenport)]

Brendan,

In my experience with non-PC equipment, blown power supplies used to
be a problem when we switched equipment off when not in use.  Since
we shifted to 24/7 operation we haven't blown a single PSU.  Switched
mode PSU's seemed to be particularly susceptible to this kind of
failure.

On the subject of electricity costs we recently removed an old storage
heater from our computer room at work as the waste heat from all the
computers meant it hadn't been used for years.  Of course the electricity
used to run the computers at night is more expensive than the Economy 7
used to run the old heater AND we have to run air-conditioning in the
summer months too.  So 24/7 can get expensive.  Now I wonder if we
could run the computers on Economy 7 at night...?

Chris.

---------- Original Message ----------
>From   : "Brendan" <jbh@xxxxxxx>
To     : <ukha_d@xxxxxxx>
Date   : Thu, 16 Dec 1999 09:51:46 -0000
Subject: [ukha_d] Re: How much?
>
>Nigel,
>
>What are your views in this context re thermal shock experienced by
turning
>on and
>off the kit ?
>
>Brendan
>
>-----Original Message-----
>From: Nigel Orr <nigel.orr@xxxxxxx>
>To: ukha_d@xxxxxxx <ukha_d@xxxxxxx>
>Date: 16 December 1999 09:36
>Subject: [ukha_d] Re: How much?
>
>
>>At 22:04 15/12/99 -0000, you wrote:
>>>Does anyone have any info on how much it costs, per day to
leave a PC (not
>>>the monitor) on 24/7?
>>
>>Typical power supplies are about 200W-300W, so probably about 350W
absolute
>>peak with a bundle of drives running continuously.  I would expect,
from
>>measuring the power drawn by our machines in the past, that it
would
>>average around 100W or less in typical use, and a bit less if the
drives
>>spin down, or there are other power saving measures.  Probably 50W
over a
>>week's measurements?  It depends critically on the processor- if
you are
>>running a 486 or Pentium under 100MHz, the power will be lower than
>>something running at 600MHz or more!
>>
>>Guesstimating electricity costs at 7p/kWh, that would be about 9p
per day.
>>Bear in mind that the power is almost all given off as heat, so if
you want
>>to be fair about it, the 100W will mean less power required from
your
>>heaters...
>>
>>I tend to leave my linux machines up continuously (except when they
are in
>>pieces on the floor ;-) ).  Windows machines are best rebooted
occasionally
>>to recover any 'leaked' resources or memory, so might as well be
switched
>>off when not in use for a day or two.
>>
>>Nigel
>>
--
Chris Davenport
chris@xxxxxxx

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