i do :-D<br><br>talked with damon about it, in the uk i understand that the load balancing is done in the street.. here we do it after the earth leakage relay.<br><br>there was one on openenergy that has done the same on a solar system.. he had stacked 3 boards.. each had a 2 current clamp and an ac/ac<br>
<br>the "master" then just pulled info from the 2 others and send info for the 3 pahses to emonbase.. of course it requires more hardware but should be accurate<br><br>/bo<br><br><div class="gmail_quote">2013/6/11 Kevin Wood <span dir="ltr"><<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">If you've got a 3 phase incoming supply then it's going to be a bit of a<br>
headache keeping an accurate track of energy consumption anyway, but I'm<br>
jealous. ;-) Almost unheard-of in a dwelling in the UK.<br>
<br>
Kevin<br>
<br>
> hmm... i think you are right.. its the phase shift part that will benefit<br>
> most from what i'm doing<br>
><br>
><br>
> i will also agree to that 0-100A is rather a hughe step... for me thats<br>
> far<br>
> beyound what i need, i can draw a max of 16A amps on each of the 3phases i<br>
> got in the fuse box<br>
><br>
> /bo<br>
><br>
><br>
> 2013/6/11 Kevin Wood <<a href="mailto:kevin@the-wood-family.com">kevin@the-wood-family.com</a>><br>
><br>
>> Indeed. Looking at the openenergy design, it's the current monitoring<br>
>> side<br>
>> that would be the largest source of error due to the fact that it lacks<br>
>> resolution, especially at low power levels. A couple of current ranges<br>
>> rather than trying to do 0-100A in one range would help there (I think<br>
>> someone's proposed a design to do just that somewhere).<br>
>><br>
>> Measuring mains voltage through an off-the-shelf step-down transformer<br>
>> with a purely resistive load takes us back into the comfort zone of most<br>
>> constructors as far as safety goes and I can't believe it introduces<br>
>> much<br>
>> of an error if calibrated. Maybe a bit of phase shift and flattening of<br>
>> the top of the waveform if the transformer is a bit close to<br>
>> saturation?..<br>
>> Not sure. Will have to have a play with that.<br>
>><br>
>> Kevin<br>
>><br>
>> > I think the question here is what are the benefits of 'almost error<br>
>> > free' mains voltage measurements ?<br>
>> ><br>
>> > Then compare to the risks, biggest being death, or fire.<br>
>> ><br>
>> > Stuart<br>
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