I would like to monitor the current and voltage being harvested by a solar panel (models varying from 6V to 18v and current from 340mA to 1A) that is being used to power a mcu (3.3V). The solar panel will be wired to a MPPT buck converter.
I did some research and seems that high-side current shunt monitors ICs would be the best approach. Am I right?
The doubt.. almost all shunt monitor ICs that I've found so far are used to monitor a large Bus voltage and needs a small Reference voltage (those names differs between vendors).
Or this one from TI, that monitors a V+ from 2.7V to 26V and requires a Reference Voltage:
I'm not understanding, since the voltage from a solar panel can change how would I provide those two different required input voltages to the shunt monitor? would be necessary to have a small battery just to do this measurement or both can be derived from same source (the solar panel) ?