The current measurement uses an ACS758ECB-200B hall-effect based current sensor IC.
The voltage measurement is isolated using an ACPL-C870 Precision Optically Isolated Voltage Sensor.
The analog signal from both measurements are converted using a ADS1115 16 bit ADC.
Coulomb calculation takes place in using an attiny1614 and communication uses isolated RS485 / MODBUS.
The hardware is finished and firmware is ready for testing in a real battery pack.
Hi Patrick,
I’m working on a similar project, just for my different PV-Strings. I’m using the ACS758…-50U and also the ADS1115. After the 1st tests, I’m not quite happy with the results, OK for me the accurately is not that important, as I’m only comparing strings with each other.
For your case it would be essential to have a precise measurement, additional to that, I wouldn’t trust this small legs of the ACS to be capable of 200A.
But never the less, looks like an interesting replacement for the Shunt board for smaller applications.
I used PZEM-017 and a 50A shunt for each of my 4 strings with a single USB RS485 interface.
Rated for 300VDC. Cheap and simple. A little python to load the values in mqtt, done.
Hi
I would like to run your project.
I have made a PCB but I’m stuck on attiny1614 programming.
I program using Arduino Uno - the code I found in your project shows errors.
Can you send a sketch of the code? ready to paste into the Arduino compiler?
Piotr, latest code is pushed.
I just re-read your post.
You will not be able to compile in the arduino IDE.
You will need Visual Studio Code with PlatformIO plugin.
