"The idea is to have whatever voltage the charger is set for actually show up on the battery(ies) terminals - regardless of wire size - from the beginning right on through until the charger (automatically), or the operator (manually), changes the output voltage setting of the charger"
Phil, I cannot see the value in that, because the battery voltage at the start is say 12.2v and you set your charger to 14.8v and connect up. The resulting voltage on the connecting wires is somewhere between 14.8 and 12.2. It will kick off at say 13.7 and rise from there. It is not going to be 14.8 until the battery is charged.
What difference can it make to anything if there is some voltage drop along the wires? It does matter for telling a solar controller when to start controlling. In that case you want the controller to know the battery voltage is actually at the controller's high set point so it does not stop charging too soon.
But with a normal charger, the battery voltage continues to rise all the way through the absorption stage, so who cares what voltage it gets to before that starts?
That end of bulk voltage has to do with the charging amps wrt battery bank size. It does not occur at the charger's set voltage which is still at 14.8, but at the voltage existing between 14.8 and whatever the battery is up to by then. Might be 14.3, eg.
What can the sensing wire do? It cannot change anybody's voltage. The battery voltage is from the chemical goings on inside it. The charger's amps are set by its own current limit for Bulk, and then by the battery acceptance for Absorption. The sensing wire can't change the charging amps. So what good is it doing anybody?
