SpiderSpartan
Posts: 8
Joined: Fri Mar 11, 2016 7:59 pm

Pi Residential Power Panel Monitoring

Thu Jun 27, 2019 7:25 pm

I'm interested in using a pi to monitor my 42 breaker, resident breaker panel. I know the pi doesn't have an ADC, but I'm trying to figure out what my best option to get 42 ADC channels back to the pi for data monitoring and reporting. This doesn't need to be utility grade monitoring, I just want a good idea of where my power is going. I have a board with 42 CTs on it with a header.

I've been looking at using Arduinos, connected through USB, as ADCs. It looks like the Atmega 32U4 has 12 ADC inputs. Ideally I'd like to use the Arduino Micro for this, but I'm having a hard time locating these at a good price (all my searches are turning up the pro micro, that has less ADC pins connected?). I did find a source of the Arduino Leonardos for about $4.50 ea, which is looking like my best option at this point.

Anyone else know of a cheap, easy way to get 42 ADC channels back to a PI? TIA

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Imperf3kt
Posts: 2554
Joined: Tue Jun 20, 2017 12:16 am
Location: Australia

Re: Pi Residential Power Panel Monitoring

Fri Jun 28, 2019 12:03 am

Have you considered asking your power supplier for a smart meter?
AFAIK, tinkering with power meters is illegal world wide.
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SpiderSpartan
Posts: 8
Joined: Fri Mar 11, 2016 7:59 pm

Re: Pi Residential Power Panel Monitoring

Fri Jun 28, 2019 12:26 am

Imperf3kt wrote:
Fri Jun 28, 2019 12:03 am
Have you considered asking your power supplier for a smart meter?
AFAIK, tinkering with power meters is illegal world wide.
This will be going on the beaker panel inside the house to see what the branch circuits are drawing. I'm not getting close to the utility meter.

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scootergarrett
Posts: 46
Joined: Sat Apr 19, 2014 2:36 pm

Re: Pi Residential Power Panel Monitoring

Tue Jul 02, 2019 7:17 pm

What about something like this
https://www.sparkfun.com/products/299
I don't know your sampling speed but with a single 4 channel ADC, 4 x 16channel multiplexers you would have 64 channels.
just a thought

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thagrol
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Location: Darkest Somerset, UK
Contact: Website

Re: Pi Residential Power Panel Monitoring

Tue Jul 02, 2019 9:40 pm

Someone has to state the obvious:

ADC pins on arduinos won't handle AC correctly nor will they cope with mains level voltages.

If you don't know exactly what you're doing, 110/220 volt AC is a cheap and easy way to get yourself killed.
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SpiderSpartan
Posts: 8
Joined: Fri Mar 11, 2016 7:59 pm

Re: Pi Residential Power Panel Monitoring

Mon Jul 08, 2019 11:16 am

thagrol wrote:
Tue Jul 02, 2019 9:40 pm
Someone has to state the obvious:

ADC pins on arduinos won't handle AC correctly nor will they cope with mains level voltages.

If you don't know exactly what you're doing, 110/220 volt AC is a cheap and easy way to get yourself killed.
Thanks for the heads up on AC. As for the mains voltages, I'll be using a Veris/SquareD BCM42M3 CT board with VITEC 57PR1821 CTs, so I won't be connecting directly to the mains. I've done a lot of electrical work in this and previous homes, so I'm comfortable (and usually safe) around power.

I've got some CD74HC4067 breakout boards and Arduino Nanos on the way for about $10, so we'll see how this works.

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