I have two separate variable DC PSUs (15V@2A, 20V@4A) from which I read the voltage and current through a microcontroller. For the current reading I use a low-side shunt.
The ground output of the supplies are connected toghether with the uC ground, then each one fed through the shunt resistor to the loads.
I would be interested in a way to somehow connect the load ground leads together and still maintain the separate current reading. I'm assuming that current will flow only through the used power supply so theoretically it should be possible.