Re: what IS the 'Unbioctium'

[Richard Challis <richard@xxxxxxxxxxxxxxxxxx>]

Been following the conversation about the CC with interest.

It's not so much the difference with the incoming meter that concerns me,
as
it only looks at the elec current drawn every 6 secs I believe, this would
along with the lack of voltage monitoring be attributed to an integration
error.

But it's the lack repeatability that did worry me.

If someone puts on a 60 watt lamp I would expect that the meter to show a
repeatable rise and also the same fall. If it showed a 50watt rise and a
50watt drop then I would be happy, but from the posts I saw it seemed to be
a rather different figure for the rise and fall.

Same that I would expect if I put a decent current clamp on the meter
tails.


This has completely put me off getting a CC sadly.

So I have brought a meter (as Stuart put it - a tariff meter) that will
measure voltage and current. Outputs it's data over RS485 (modbus RTU
protocol) I hope to fire up my rather rusty software skills to write a
driver that will move this to XPL. (one day soon!)

Cheers

Rich

2009/2/26 Stuart Poulton <stuart.poulton@xxxxxxx>

> > The 7 day and 30 day usage on display and xml is out by 50%
actual
> > reading
> > at supply meter.
>
> I agree that 50% might be more than you would expect. Please remember
> the following
>
> 1 - Current Cost only measures current
>        - It has no knowledge of voltage variations
>        - It can't take into account power factor deviations
>
> 2 - The current cost transmitter sends an instantaneous reading of the
> current approximately every six seconds, your supply meter in reads
> the power used continuously. I suspect that this leads to lower power
> used reading than might be expected, although without knowing how
> power usage is actually calculated I can only speculate.
>
> I am providing feedback to currentcost, highlighting some of the
> problems that users on this list are experiencing, when I've got
> answers I'll pass them on.
>
> Regards
>
> Stuart
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>


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