Can I Use Two 10ga Wires to Reduce Voltage Drop for My Solar Panels?
Asked by User1234!
Hey everyone! I'm setting up my off-grid cabin with solar panels, positioned about 150 feet away from the cabin. I'm planning to run about 20 amps and I have some leftover 10 gauge THHN wire from another project that I want to use. Would it be safe to double up the wires to help reduce voltage drop? I'm planning to run the cables through a 1-inch conduit from the cabin to the panels. I really want to utilize what I have and not waste any energy. Thanks for your insights!
Answers
You're not technically allowed to do that under the NEC, but if you're not worried about following code, it could actually work. If your voltage for the string is between 300-600V and you're running 20A, then the voltage drop with 10AWG over 150 feet won't be too significant.
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CuriousElectro: Gotcha! So even though it might technically work, may I ask about the DC setup? I have to calculate the loop at 300 feet, but I'm thinking doubling the wires could help reduce some losses, right?