Looking for power metering equipment...

Thu Jan 15 13:57:46 UTC 2004

Concur with you need wattage not amperage.  There is a 'relatively' cheap 
method of doing this however local electrical codes may put a damper on 
this type of project.

You put a current transformer on each branch circuit.  A 'typical' current 
transformer will generate 1Millivolt per Milliampere.  You then install a 
A/D board in a PC and write a simple application to query each channel of 
the A/D.  or purchase a commercially available SMNP datalogger.

                            Scott C. McGrath

On Thu, 15 Jan 2004, David Lesher wrote:

> 
> Speaking on Deep Background, the Press Secretary whispered:
> > 
> > 
> > Question: We are looking for something that sits in the PDUs or branch
> > circuit-breaker distribution load centers, that, on a branch-circuit by
> > branch-circuit basis, can monitor amperage, and be queried by SNMP.
> > 
> > Considering there are several hundreds of circuits to be monitored, cheap
> > and featureless (all we need is amperage via SNMP) is fine.
> 
> You really want wattage. The power factor of switched supplies
> is far from unity.
> 
> Take a look at <http://www.quadlogic.com/transmeter1.html>
> 
> Also, recall you sell each watt twice -- once to heat up
> a chassis, and a 2nd time for the HVAC to cool it.
> 
> 
> 
> 
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