How do I determine the wire gauge from combiner box to charge controller?
You all are probably going to get tired of my questions before I'm done, but here's another question- I've got my wiring in place (not connected yet) for the first of two arrays. Although I've labeled it an 8kw system, at 320w per module, I've got to leave one off to even out the arrays to 12 each, so it's actually 7680w, with 3840w per array. I've got 4 strings of 3 panels, as suggested by those who've answered my questions, that will be going through a Midnite Solar 6 panel combiner box (each= I may add panels later), then going through MS classic 150. The return leads on my home run wires run 15' and under, and the distance from the combiner box on the array pole to the charge controllers is about 30' total path of the conduit.
My array wires are, of course, 10g, so what is the acceptable gauge for the combiner to cc wire? I'm thinking 6g. but I'd rather be safe than sorry.
While I'm asking, I've got another hypothetical question for a future run to the house. As of now, as I've said in other posts on this project, we're temporarily (until our house is built next spring/summer) installing all of our equipment in a shed I'm building between the arrays to be used during some of the construction and work on the property. After the house is built, I'll transfer as much of the equipment as is practical to the houses garage, which will be about 270' away from the "power house" and arrays. If I were to leave the solar chargers in the shed, what gauge wire would I need to use for that 270' run? Better yet, where can I find a reference that would allow me to figure this out myself? I really appreciate everyone's help on this forum, but as soon as I get a question answered I have another in the next phase. I'm starting to feel like a mooch. I've always been a DIY'er, but I hate to keep bugging you all with questions that probably seem trivial to you who know this stuff already. Thanks for any and all replies. Lee
"Knowing is not enough, we must apply. Willing is not enough, we must do." Goethe
NOS Trace Xantrex power panel, (3) Trace Xantrex SW5548's (2 NOS in boxes, one used), Xantrex DC/disconnect, AC disconnect/conversion, Xantrex T240 Auto transformer, (3) C40 PWM charge controllers, (2 NOS, one used) 8k LG Neon 320w, (8)Evergreen Solar 120w (960w) , Bergey XL.1 1.5k genny, AirX 400 genny, 48v Interstate Workman batts (frozen/toast), (2) MT Solar Top of Pole 12's, (2) Midnite Solar MSPV 4 combiner boxes, (2) Midnite Solar Classic 150's and one nice Ozark hilltop to set them all.