What Landscape Wire to Use for 20 Watts at 180 Feet?

What Landscape Wire to Use for 20 Watts at 180 Feet?

If you're powering a 20-watt landscape lighting fixture 180 feet away from your transformer or power source, choosing the correct wire gauge is essential for safe, reliable performance.

Recommended Wire Gauge

For this setup, use 12 AWG landscape wire. It offers a good balance between voltage stability and cable flexibility at this distance.

Why 12 AWG Works

At 180 feet, 20 watts (~1.67 amps) through 12 AWG results in a voltage drop of approximately ~0.95V (7.9%). While there is some drop, this is typical for low wattage landscape lighting and remains safe and effective especially when using high quality LED fixtures. In real world conditions, this setup provides reliable performance without noticeable dimming.

Voltage Drop Summary

  • Power: 20 watts
  • Voltage: 12V
  • Current: ~1.67 amps
  • Distance: 180 ft
  • Voltage drop on 12 AWG: ~0.95V (7.9%)

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Tips for Installation

  • Bury cable at least 6 inches deep
  • Use waterproof connectors
  • Avoid tight bends or damage to insulation
  • Label wire ends for easy troubleshooting in the future
  • Keep wire runs away from sharp rocks or edges that may cut the insulation

FAQs

Can I use 14 AWG instead?
It’s not recommended at this distance and load. Stick with 12 AWG to keep voltage drop under control.

What if I expand my system?
12 AWG already gives you excellent headroom. If you're adding significantly more fixtures, recalculate the total wattage to confirm, but 12 AWG will usually handle moderate expansion.

Is voltage drop really that important?
Yes too much drop can dim your lights and reduce lifespan. Even a slight excess above 5% in low power setups like this is typically safe but worth monitoring.

Should I use solid or stranded wire?
Stranded wire is recommended for landscape lighting due to its flexibility and ease of installation around curves and obstacles.

Summary

Use 12 AWG for 20 watts at 180 feet. It’s a smart choice that keeps voltage drop manageable and your lights running smoothly.

← See Wire Sizes for Other Wattages and Distances

Disclaimer: Calculations are based on standard conditions and estimates. Actual performance may vary depending on installation specifics, environment, and cable quality.