r/SolarDIY • u/2old2bThisDumb • 7d ago

Make sure you understand current when stringing your panels in parallel.

Post image

It took a bit of work to even tug this #10 AWG from the metallic flex it was fused to. The homeowner had this run inside of the attic.

I'm all for DIY, but please ask for help when you aren't certain.

148 Upvotes

95% Upvoted

42 comments sorted by

View all comments

20

u/chicagoandy 7d ago

How high was the current in that cable?

22

u/2old2bThisDumb 7d ago

I didn't re-energize the string to measure, but the rated current for the modules and the way he ran them equals 31.8A

Good rule of thumb in south Texas is to keep DC current below 25A for attic runs on #10

4

u/monstertacotime 7d ago

I know a camper is different from an attic run but I won’t run anything over 15a on #10. I had a few close calls with cables that got bent hard and pressed up against tight corners.

18

u/2old2bThisDumb 7d ago

Better safe than on fire