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'Energy saver' power factoring?

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Posted by ...........Rob on May 20, 2012, 2:44 pm
 
Hi all.  Saw this on ebay (seems to be lots of em)
http://www.ebay.com/itm/Province-Electric-15KW-Technology-Energy-Power-Saver-/280881022584?pt=LH_DefaultDomain_0&hash=item4165d04678

It advertises to correct your power factor saving $$.  I understand a little
about the basics of power factoring.  

Is the whole kit in the category of 'Too good to be true'?

I suspect the latter, but I'm sure there's somebody here who knows for sure.

Thanks

..............Rob

Posted by Jim Wilkins on May 20, 2012, 4:52 pm
 


http://www.ebay.com/itm/Province-Electric-15KW-Technology-Energy-Power-Saver-/280881022584?pt=LH_DefaultDomain_0&hash=item4165d04678

It could save money for a commercial user but not a residence, because
the metering methods are different.
http://www.diyaudio.com/forums/power-supplies/199479-do-domestic-kwh-meters-ordinary-electric-meters-record-reactive-power.html

jsw



Posted by Mho on May 22, 2012, 4:12 am
 Not quite true.

The way I understand these boxes is they lower the voltage to motors running
at bad power factors. A synchronous motor then has to pull more current at
the lower voltage to produce the same HP and the phase angle of the load now
becomes closer to unity pf. While that may, in itself affect the power
showing up in a residential kWh meter the motor runs cooler and the loss of
energy due to motor heat is reduced. Efficiency of the motor is increased
and real power is decreased. Residential bill payers can benefit but I
suspect it isn't very much difference.

I have never actually experimented with one on accurate metering devices..

------------
It could save money for a commercial user but not a residence, because
the metering methods are different.
http://www.diyaudio.com/forums/power-supplies/199479-do-domestic-kwh-meters-ordinary-electric-meters-record-reactive-power.html

jsw



Posted by mike on May 22, 2012, 6:19 am
 On 5/21/2012 9:12 PM, Mho wrote:

http://www.diyaudio.com/forums/power-supplies/199479-do-domestic-kwh-meters-ordinary-electric-meters-record-reactive-power.html

Got any references in support of your creative analysis?

Posted by Mho on May 29, 2012, 2:47 am
 Yes but it was written up in journals back in the 1970s in many magazines
when triacs were first invented.

-----------


On 5/21/2012 9:12 PM, Mho wrote:

http://www.diyaudio.com/forums/power-supplies/199479-do-domestic-kwh-meters-ordinary-electric-meters-record-reactive-power.html

Got any references in support of your creative analysis?


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