The one thing that got missed in this discussion is the power loss through the resistance in the wires themselves. The thinner the wire the higher the resistance per unit of length, and the higher the current the more loss as well. When you double the voltage (6 to 12) the current is cut in half, so the power loss in the wire is 1/4 as much. In a 12v system you can use thinner (cheaper) wires and still get better power delivery/efficiency to the loads.
Last edited by merlynski; 10/17/2010 12:18 AM.
