Re: [mh] Whole home power monitoring

I mean sort of but not really. You can assume 120V but in reality the
actual voltage can vary +/- 10% in normal conditions so just assuming the
voltage and dividing the kW reading you could be 10% or more off on amps.
That may or may not be acceptable to you.

On Sun, May 23, 2021, 12:11 PM H Plato <[email protected]> wrote:

> I’m trying to understand amps, so I know I have 2 120v phases and can read
> the kW, so I should be able to get amps right?
>
> On May 23, 2021, at 9:56 AM, Spencer Ryan <[email protected]> wrote:
>
> 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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>>
>>
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>

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