Refer to first illustration at
www.bmillerengineering.com/elecsys.htm Voltage drop calculations for the described are an iterative process—step-by-step; trial-and-error for various combinations of load. Pay a power EE to do that, or study the textbooks, set up a spreadsheet and do it yourself.
[This message has been edited by Bjarney (edited 08-10-2004).]