Correct me if I am wrong !!!
The placement of a shunt on a negative cable in different areas will provide different amp readings.
1 - If I have a shunt at the "House Bank" before the bus bar. That will allow monitoring for the entire house bank.
2 - If I place a shunt after the distribution bus bar, on a cable to a device. I will be able to monitor
the amps of the single
3 - Thus I am able to monitor
the amps for individual devices, as well as the entire house bank total accurately.
Basic Diagram is attached to show my meaning.