So I have this shunt in my power system connected just a few inches from the battery bank's final outgoing (to system) negative terminal. But I can't seem to find any data on whether or not these devices actually lower the final output voltage to the system by the stated 50mV drop. I did find some articles that seem to suggest higher current shunts have the ammeter wired in parallel to the shunt resistor such that only a very small percentage of current flows through the ammeter. That would seem to suggest that the voltage drop may only be experienced by this small parallel circuit, and the main system voltage would be unaffected.
This type of shunt is widely used, so I can contact the manufacturer, but I suspect the answer applies to nearly all of the major battery shunts commonly available for purchase at RV and Marine stores, inverter/solar shops, Amazon, etc. Does anyone know for sure how this works?