Re: Hall Effect for outlet strips
- From: John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 09 Aug 2005 20:52:50 -0700
On Wed, 10 Aug 2005 01:42:09 +0000 (UTC), David Lesher
<wb8foz@xxxxxxxxx> wrote:
>So on the NANOG list, there's a thread on where to find a rack-mount
>outlet strip with per-outlet measurement, for bill-back purposes in
>a server hotel environment.
>
>The data so far is grim:
>
>
>> {baytech}
>> I had moderate success with this suggestion. Their technical support said
>> the only product they had that does this is the 4 outlet RPC5 or RPC6
>> (ethernet version vs serial version). Unfortunately, it costs $644 each
>> (lowest price I've found so far) and accomplishes it's individual
>> monitoring by replicating power in and power out plus an ethernet port 4
>> times. Still, if it's the only one out there I guess they win (although
>> at $150 per outlet, ouch, that goes over my $4000 budget for this).
>>
>> http://www.baytech.net/products/prodlist.php?show=RPC5
>
>And it's not UL-approved.
>
>So I was thinking; is there a Hall-effect package that could
>cheaply tell you raw amps at least on each of n outlets?
A small current transformer+burden resistor will cost a couple of
dollars per load, with isolation. Run ton of these into a cheap 32 or
64-channel ADC card, from Measurement Computing or somebody. Then just
hack a little code to sample and process the current signals. One
cheap PC could handle a hundred loads or so. Not much more work would
get you true power, not just amps.
John
.
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