[OpenTRV-dev] OT: Voltage drops

[Bo Herrmannsen]

i do :-D

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.

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

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

/bo

2013/6/11 Kevin Wood <EMAIL ADDRESS HIDDEN>

> If you've got a 3 phase incoming supply then it's going to be a bit of a
> headache keeping an accurate track of energy consumption anyway, but I'm
> jealous. ;-) Almost unheard-of in a dwelling in the UK.
>
> Kevin
>
> > hmm... i think you are right.. its the phase shift part that will benefit
> > most from what i'm doing
> >
> >
> > i will also agree to that 0-100A is rather a hughe step... for me thats
> > far
> > beyound what i need, i can draw a max of 16A amps on each of the 3phases
> i
> > got in the fuse box
> >
> > /bo
> >
> >
> > 2013/6/11 Kevin Wood <EMAIL ADDRESS HIDDEN>
> >
> >> Indeed. Looking at the openenergy design, it's the current monitoring
> >> side
> >> that would be the largest source of error due to the fact that it lacks
> >> resolution, especially at low power levels. A couple of current ranges
> >> rather than trying to do 0-100A in one range would help there (I think
> >> someone's proposed a design to do just that somewhere).
> >>
> >> Measuring mains voltage through an off-the-shelf step-down transformer
> >> with a purely resistive load takes us back into the comfort zone of most
> >> constructors as far as safety goes and I can't believe it introduces
> >> much
> >> of an error if calibrated. Maybe a bit of phase shift and flattening of
> >> the top of the waveform if the transformer is a bit close to
> >> saturation?..
> >> Not sure. Will have to have a play with that.
> >>
> >> Kevin
> >>
> >> > I think the question here is what are the benefits of 'almost error
> >> > free' mains voltage measurements ?
> >> >
> >> > Then compare to the risks, biggest being death, or fire.
> >> >
> >> > Stuart
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