Hey everyone! I'm in the process of installing a DC cable from my loft to the garage while doing some renovations, and I need your advice. The cable run is about 40 meters. I can fit 15 solar panels on my roof. Do you think a 4 core 6 mm² Doncaster Cables PV ultra cable would be adequate for this setup? I'd really appreciate if you could break down the math for me! Thanks!
2 Answers
You'll be good with a 6mm² cable! For a run of about 40m, it can handle the load from 15 panels just fine. I've seen setups like this run well even with 60m distances using similar cables—you're making a solid choice by going for the armoured DC cable instead of regular SWA. Keep it up!
It really boils down to your solar panels' performance specs, specifically the VOC and VMP. Also, keep in mind how your MPPT handles the voltage. If you're anticipating any shading issues, that could change things too. But overall, the 6mm size is usually in the safe zone for good performance.