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Current Cost Support Forum • View topic - Monitoring total usage in home with two circuit panels

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PostPosted: Wed Oct 05, 2011 3:46 am 
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Posts: 4
(I am located in the USA)

I have an ENVI energy monitor with a single transmitter and two current transducers (plus a web bridge). The transmitter has 3 sockets total and I am using 2 of them for the 2 current transducers.

My home has 2 independent 200A circuit breaker panels, each being fed by a 240V single-phase pair of wires. I can clamp the current transducers on one or the other of the 240V feeds and monitor the energy usage of just that one panel, but what do I need to monitor both at the same time?

Do I need to buy a second transmitter and 2 more current transducers? (If so, what are the part or model numbers of what I need?) Will my monitor be able to display (and hopefully total) both circuits?

Can I do something "clever" like clamp one of the CT's on a single wire of one feed and the other CT on a single wire of the other feed and then double the displayed Watts? (I am thinking this might actually work if I clamp on the opposing phases.)

Thanks!


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PostPosted: Thu Oct 06, 2011 4:12 pm 
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Location: East Sussex
Are both panels fed from the same electric meter?

If yes, can you move the clamps and transmitter to that location?

Automan.


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PostPosted: Thu Oct 06, 2011 11:21 pm 
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Yes, they are both fed from the same meter, but I do not have access to the wiring at that location (it is inside a locked metal box that only the utility company can access).


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PostPosted: Sat Oct 08, 2011 3:16 am 
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Location: Melbourne, Australia

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PostPosted: Sat Oct 08, 2011 11:53 am 
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Location: East Sussex
American households typically have a 3 wire single phase and neutral system.

220v between the phase lines and 110v between a phase line and neutral (the 220v needed for larger appliances e.g. the cooker, washer / driers and ac units).

Thus they need two clamps on the two phase lines to measure the house load.

In the UK a property would typically have a single phase and neutral system giving you about 230v (one clamp on the phase line) or a three phase and neutral system with 415v between phase lines and 230v phase line to neutral (3 cc clamps on the phase lines).

Automan.


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PostPosted: Sat Oct 08, 2011 5:30 pm 
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PostPosted: Sun Oct 09, 2011 8:04 pm 
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PostPosted: Mon Oct 10, 2011 6:05 pm 
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PostPosted: Tue Oct 11, 2011 3:33 am 
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PostPosted: Tue Oct 11, 2011 10:02 am 
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