Re: [mh] Whole home power monitoring

Since voltage is constantly changing you need to know both amperage and
voltage for accurate power usage measurement

On Sun, May 23, 2021, 11:51 AM H Plato <[email protected]> wrote:

> Thanks everyone for the suggestions!
>
> I was thinking about those clips, but I’m mostly interested in overall
> usage, and I don’t know if I’d need 2 power monitoring off the 100a
> service, one for each phase.
>
> I had RTL-SDR almost working a few years back sending data to MH through
> MQTT. The RTL-SDR process had a memory leak so it would make the rpi
> unresponsive, but I was able to read my outside electrical meter. I’m going
> to dust that off and maybe reboot the rpi every night to address the memory
> leak.
>
> https://hackaday.com/2017/12/21/read-home-power-meters-with-rtl-sdr/
>
> So stupid question — how would one convert kW to Amps. I’m on a 60hz/120v
> service, but since there are 2 phases coming into the house, should it be
> the meter kW / 240 or kW / 120?  I think it’s 240, but I’m not sure.
>
> > On May 23, 2021, at 9:32 AM, Eloy Paris <[email protected]> wrote:
> >
> > Hi Howard,
> >
> > Have you seen Marc's blog posts on this topic? The latest seems to be
> > this one:
> >
> >
> http://marc.merlins.org/perso/linuxha/post_2010-08-13_Fine-grained-house-wide-power-monitoring-with-Brultech-ECM1240_-ecmread_py-_with-net-metering-support_-and-graphing-with-cacti.html
> >
> > A decade old but I'd still take a look there as a starting point, see
> > what the equivalent products today are, e.g. the Brultech Greeneye, etc.
> > Good pointers and experiences that Marc shares there. And Cacti would
> > probably still be in the picture, of course.
> >
> > Cheers,
> >
> > Eloy Paris.-
> >
> > On Sun, May 23, 2021 at 08:41:28AM -0600, H Plato wrote:
> >
> >> Has anyone found any good DIY power monitoring solutions? My panel is
> full and I’d to get an idea of the average and peak load. I have a 100a
> service, and the wiring from the utility isn’t sized for 200a, so an
> upgrade would be pretty expensive. I’m hoping that the usage is low enough
> that I can just replace the panel without upgrading the service, so having
> usage tracking would be really helpful.
> >>
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