Panel to Solar Controller Wire Size
As some of you already know, I'm piecing together a solar system. Controller is a Morningstar 45A PWM. Panels will be two 12V 150W wired in parallel. I'm going to be using a combiner box on the roof, ...
Forum Discussion
smkettner wrote:This is good feedback.
GD calculator says you lose .8 volts with #10 and .5 volts with #8 with 25 amps flowing. #10 is minimum for ampacity IMO.
Say they are 18v Pmax panels you will still have 17+ volts hitting the controller so I would call it good. #6 would be killing it but could work after the controller if using the same coil of wire.
A better analysis would involve knowing the panel specs, each panel to combiner wire length and then the actual length combiner to controller and controller to batteries.
