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
If you were using an MPPT controller I'd say AWG 4 copper, but since you are using a PWM controller and ultimately expect 450 watts in panels configured in parallel, I'd go with AWG 8 copper from your combiner box to the controller. I'd use AWG 2 copper between the controller and batteries if there is five feet or less between them.
Assuming 19 volt panels and 24 amps, the controller would still be seeing at least 18 volts with 8 gauge wire.
Assuming 19 volt panels and 24 amps, the controller would still be seeing at least 18 volts with 8 gauge wire.
