Can someone shed some light on the intended functional purpose of the Voltage Sense wires on a Multi/Quattro?
Are you using it? If so, how/why?
The manual says loosely that it's "to make up for voltage losses across the wires".
With the volt sense wires connected or not connected, under minimal load or loads in excess of 100A, I've never seen any change in the reported voltage by the system.
This was true even before my installation of a BMV (with the lithium batts) and still so now, since SOC and voltage readings (I assume) are now coming exclusively from the BMV.
The voltage reported (by the BMV) is within .01 V of the voltage reported by the BMS on the batteries with minimal load, and within the expected 2-3% difference under heavy loads.
I'm using 2/0 (70ish mm cross section) wires and runs are around 10-13 ft to the batteries. The BMV is 5-7 ft to the shunt. 24V lithium system.
The lead-acid system prior was considerably sloppier, although still using 2/0 cable, and I still recall no differences.