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Simple residential power usage display - Page 2

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Posted by William P.N. Smith on May 11, 2006, 1:26 pm
 


googlegroup@ericrucker.com wrote:

I'd get a meter from http://hialeahmeter.com/  with a pulse output
every watt-hours, and hook up a flashing light...

Posted by JoeSP on May 11, 2006, 1:47 pm
 




Google: wattmeter
http://www.elexp.com/tst_1522.htm
http://www.clarke-hess.com/2330.html
http://www.sciencebuddies.org/mentoring/project_ideas/Elec_p022.shtml?from=Home  



Posted by Rat Killer on May 11, 2006, 3:37 pm
 

I think the device you are looking for is "The Energy Detective"  we
have one and it works pretty much as you described.  It places CTs on
the incomming mains and gives a continuous and real time view of power
usage.  both in KWH and $$.  Very will thought out device and easy to
install.  We bought ours from the manufacturers web site.


Posted by RoughRider on May 12, 2006, 4:47 am
 

http://www.theenergydetective.com/frameset.asp   $40



Posted by danny burstein on May 12, 2006, 5:15 am
 



.. http://www.theenergydetective.com/    
    price: $40

it looks good, but....

a) their web page is fussy about requiring
specific browsers. I had to fire up (cough
cough) Internet Explorer...

b) Their faq says it is " Designed for TYPICAL NORTH
AMERICAN residence. Service 120/240V 60HZ. Will
not work on 3-phase services or 230V 50HZ services
typical in other countries."

The problem with "B" is that many apartments
in NYC (and other places...) get two legs
of a three phase circuit, using a "skip over"
arrangment.

APartment #1 would get legs A and B, apt #2
would get B and C, #3 A and C. Rinse, lather,
repeat. All 3 legs go to the roof for the
common elevator motor and perhaps HVAC.

This gives each apartment 120V (hot leg to neutral)
and an almost... 240V circuit (actually 208V)
when tapping two hot leads.

(In most, but certainly NOT all cases, the 208V
circuit will run 240V appliances more or less OK).


--
_____________________________________________________
Knowledge may be power, but communications is the key
             dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]

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