[OpenTRV-dev] OT: Voltage drops

[Kevin Wood]

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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