Using the Rpi, i've built a system that reads the data from my SMA inverter, and shows live output to an analog meter from the 30's.
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I'm using the hardware PWM output on the Pi to generate the 'analogue' output. Without any filtering, I'm directly feeding it to the analogue meter. As it turns out: 50% dutycycle actually means 50% output on the meter scale :)
Lucky me, the theory seems to work....
now the Meyer is up and running, it's time to do something about the scale... Made a photograph, edited it using the Gimp, printed it to fit over the original :) See the result:
The vintage meter I bought had a broken connector on the bottom (i knew that), so I replaced that today.
I've also tested the meter, it works :) It's in remarkably good shape. Time to tweak the limits and scale of the meter...
I've just found a cool bakelite vintage meter (Crompton Parkinson 15mA) on a trading website. Bought it :)
The Software is already running, the power output is now show on a (way too modern) analogue meter that I owned already. In the daytime, I'm showing the actual output power, in the night i'm switching to the total kwh for that day...
Install you Raspberry Pi with NOOBS:
Install and configure SBFSpot for the logging of your SMA inverter
SBFSpot installation on the Rpi
Make sure that csv logging is enabled, since my python script uses these files.
Log in using ssh on the Pi
Install the wiringpi2 library on the raspberry:
Sander Los
sudo apt-get update
sudo apt-get install python-dev python-pip
sudo pip install wiringpi2
This is a good idea, might have to make one of these myself!
Regards
Lithium ION
eelco.rouw
OzQube
J3TTBlack88
My experience with the project has been very valuable. Interested in sharing it with https://medidordevelocidadtelmex.online/ team members so that they can also read it and implement something new.