Date : Tue, 01 Sep 2009 03:34:47 -0500
From : mfirth@... (Michael Firth)
Subject: Leccy @ Acorn World '09
On Mon, 31 Aug 2009 22:55:24 +0100, "Michael Firth" <mfirth@...>
wrote:
<snip>
> I agree - I think we need to work out what the typical power consumption
of
>
> a Beeb (or Electron,
> or Atom, and the 32-bit Acorn Systems) setup is, and then multiply that
by
> the number of systems
> present.
>
> I'd have thought that even with a vintage Cub monitor, and an external
PSU
> floppy drive, a Beeb setup
> would only reach around 1A.
>
> I'll put some of my bits on a similar plug in power monitor tomorrow, and
> post the results here.
>
So a quick test with most of the setup I'll be bringing - the A3020 plus a
CRT VGA monitor, and the BBC B and B+, with a Cub and Sony CRT TV
respectively
gives a total VA or 'apparent power' reading on the power meter of around
380VA
(around 1.5A)
Interestingly (and possibly influencing the kit I'll bring!) the VGA
monitor on
the A3020 is drawing well over a third of that power. The Cub takes around
100VA,
and is probably the second biggest consumer. The (much more modern) Sony
CRT TV
is 60VA, and the BBCs are 30VA each.
The A3020 seems to be very efficient - I think its well under 20VA.
The plug top PSUs for my Ethernet switch and Econet clock are 10VA for
both, and the
PSU for my floppy drives is 10VA.
If other setups were similar (I'm sure many will be more power hungry,
especially any
with modern ineffecient PCs), then you could get around 20 times the setup
I tested off
a single 30A ring main (which incedentally would need 160 power points!)
Regards
Michael
> I suspect that even for the 90ish sockets on the original diagram, you
> might
> still have leeway on a 30A
> ring, provided that:
> a) The whole 30A ring current is available in the room
> b) Each socket is taking an average of less than 0.3A, or 80W.
>
> Regards
>
> Michael
>
>
>
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