North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Looking for power metering equipment...
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. > > > > > -- > A host is a host from coast to [email protected] > & no one will talk to a host that's close........[v].(301) 56-LINUX > Unless the host (that isn't close).........................pob 1433 > is busy, hung or dead....................................20915-1433 >
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