Re: [mh] Whole home power monitoring

Ah, ok. the -/+ 10% is good enough for my purpose. I’ll see what data comes in from the power meter. If people are interested I’ll post how it works. The USB SDR device was like $10 from ebay, and I can read my water and power meter (as well as a bunch in the neighbourhood it seems). It’s been a year or so, so hopefully there’s an update to RTL, or maybe I’ll just skip the rpi and use my server instead.

> On May 23, 2021, at 10:25 AM, Spencer Ryan <[email protected]> wrote:
> 
> Also, assuming you are in North America, you don't have two phases, you have "Split phase" single phase service. It's a subtle difference. 
> 
> On Sun, May 23, 2021 at 12:16 PM Spencer Ryan <[email protected] <mailto:[email protected]>> wrote:
> 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] <mailto:[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] <mailto:[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] <mailto:[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/ <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] <mailto:[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 <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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