Redsky, I'm all about books. Will order that one and thanks for all the great info.. I have been a bit puzzled over wire sizes since the article I read when I began my solar studies said use very large gauge.
This little device was recommended to me and even to install one on each line both coming and going but the wiring on it looks to be very small.
I know enough about elec to know that jumping around, especially down in size is not a good idea and as you say, RV's get so much voltage drop which nobody needs...
Here's the link in quiestion ::: http://www.ebay.com/itm/181110318783?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT