Electricity Monitoring System

Postby ip_wirelessly » Wed Nov 14, 2007 10:43 am

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I have been working with a local start-up on a wireless metering system. Its one of my company's first big full cycle development jobs. It finally came out of the closet last week. Can't show too much of it yet, but with all the green talk around here I thought I would share. You can read more on my blog, but here's the basic idea:

The PowerTab plugs into a home's circuit breaker to be able to monitor how much power the house is using. From the circuit breaker, the monitor sends a signal via Power Line Communication to the display unit. A person can carry this display unit around the house flicking the power on and off to devices around the house and see, in real time, how much power is being consumed. Its a great little tool for educating people about how much power they are consuming by leaving common household items powered on.
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Postby pier » Wed Nov 14, 2007 11:41 am


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Hi. I've seen several of these concepts over the last 5 ~ 6 years. The best by far had no information display, LCD, knobs, dials or other ephemera. It just glowed with colour change representing power usage: i.e. keep it in the green (low power), minimize time in blue glow (high power). It was a beautiful design made more so because it was simple.

Postby ip_wirelessly » Wed Nov 14, 2007 12:13 pm

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Would be interested in seeing the product you refer to. Also, this isn't a concept. A working proto is in our lab.

There is a color aspect to this device also. The company is working on the algorithm for it so we can't really be too sure how it will be implemented in its final form.

As of right now, as you said, Green is "good" red is "bad".

But if you think about it, How do you gauge your house's good from bad on day one? It is a constantly changing number. It may be red during the day but green at night. Do you take an average? Statistically, over time, that average will flatten out.

Having no interface at all would be challenging, at best, considering all the different factors that play into the localization of each product. Rates are different in BC from Ontario, for example. Ontario has a handful of different power companies, while BC has one.

We've done what we can to simplify it down as much as possible. At the end of the day, its their S/W group that will make this thing sing and dance.

Postby jGray » Wed Nov 14, 2007 12:38 pm

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the renderings look really nice.

whats the proposed environment? are these outdoor fixtures? i know you said they're wireless, so i suppose they could fit in anywhere, but where do you see the user putting them?
- jg

Postby ip_wirelessly » Wed Nov 14, 2007 12:49 pm

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Its a 3 part system.

The monitor is in the circuit breaker and detects the "flow" of electricity into the house. It then sends that data throughout the house via PLC (Power Line Communication).

The transmitter plugs into any outlet in the house. It receives the signal from the monitor and then relays it (wirelessly) to the hand-held display.

The display is what you see rendered above. It is what you carry around the house as you flip lights on and off, etc.

Postby yo » Wed Nov 14, 2007 7:32 pm

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I likey.

I heard from several Prius owners that they like the interactivity with the on board computer to play "how good can I get my gas milage today"... this could bring some of that flavor to the home.
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Postby dawolfman666 » Thu Nov 15, 2007 6:50 am

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Similar to Pier's one, is the Watson from http://www.diykyoto.com/ which retails for £149...purdy

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Postby ip_wirelessly » Thu Nov 15, 2007 12:32 pm

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Ya, there are several competitors in this market. There's an Aussie company called TED, and one other. They're both ugly, design-wise. I remember seeing one from Japan on Gizmodo recently as well that had cutsie little penguins on the interface.

The Japanese and this Watson 01 were the first to use Design as a selling feature.

Postby dawolfman666 » Thu Nov 15, 2007 12:38 pm

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what about having some crazy units like how long it took the oil form and how quickly your burning it off.

Postby ip_wirelessly » Thu Nov 15, 2007 12:43 pm

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dawolfman666 wrote:what about having some crazy units like how long it took the oil form and how quickly your burning it off.


Funny you say that. They've been thinking about equating power consumption to some sort of semi-esoteric value like you're referring to.

I am sure there has to be some way to equate it to barrels of oil per year you're burning by leaving your computer on....but my brain is too small to wrap around that one.

Postby mountainflow » Thu Nov 15, 2007 1:27 pm


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I'm curious as to how much energy a device like this consumes on it's own?
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Postby ip_wirelessly » Thu Nov 15, 2007 1:33 pm

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mountainflow wrote:I'm curious as to how much energy a device like this consumes on it's own?


hehe.....kind of like how much each hybrid consumes in production ;)

Postby mountainflow » Thu Nov 15, 2007 1:43 pm


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Something like that.

Right now there is a concern about vampiric electronics consuming energy even when switched off. It seems that a monitoring device like this is using energy all the time and while it is providing useful information, it is also adding to the problem it is designed to solve.

So my question is: How much energy do these devices use, and is this a significant amount?
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Postby ip_wirelessly » Thu Nov 15, 2007 2:13 pm

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mountainflow wrote:Something like that.

Right now there is a concern about vampiric electronics consuming energy even when switched off. It seems that a monitoring device like this is using energy all the time and while it is providing useful information, it is also adding to the problem it is designed to solve.

So my question is: How much energy do these devices use, and is this a significant amount?


Good question.

I will see if I can get that answer.

Postby ip_wirelessly » Thu Nov 15, 2007 5:50 pm

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ip_wirelessly wrote:
Good question.

I will see if I can get that answer.


They are aiming for less than 2 Watts. Firmware is what will drive this and that development is not complete yet.

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