I made an isolated high voltage (up to 850V) and isolated current (+/- 200A) shunt and is based on the original diyBMS-Currentshunt: GitHub - pprasse/diyBMS_CurrentVoltage_ADS1115: Isolated current and voltage sensor for up to 850V based on ADS1115 and attiny1614
Maybe the project is useful to someone.
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.
If you have comments, let me know.
All the best,