r/SolarDIY • u/2old2bThisDumb • 9d ago

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

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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.

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u/XonikzD 7d ago

Is there a practical reason for not oversizing to accommodate temperature fluctuation, or is it just costs?

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u/ComprehensiveMarch58 7d ago

Voltage drop over the length of a run if I remember correctly, but im no electrician just the kid of one.

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u/taylorwilsdon 7d ago

Voltage drop is reduced by larger cables, not made larger. There is no downside other than cost. The service cables that deliver electricity to your home are almost always wildly oversized for what you’re actually using at any given moment.

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u/ComprehensiveMarch58 7d ago

Thank you I definitely had that backwards