Solar Cable Size Calculator


Introduction: Efficient energy transmission in a solar power system relies on selecting the correct cable size. The Solar Cable Size Calculator aids in this process by considering the solar system voltage, distance to the charge controller, and an acceptable level of current loss.

Formula: The formula used in this calculator is a general example. It involves calculating the voltage drop and determining the cable size based on the allowable current loss. The actual calculation involves factors such as cable resistance, which is determined by the cable material and size.

How to Use:

  1. Enter the solar system voltage in volts.
  2. Input the distance from the solar panels to the charge controller in meters.
  3. Specify the allowable current loss as a percentage.
  4. Click the “Calculate” button to find the recommended cable size.

Example: For a solar system with a voltage of 48V, a distance of 20 meters, and an allowable current loss of 3%, the Solar Cable Size Calculator might recommend a cable size of 6 mm².


  1. Q: Can I use this calculator for other electrical applications? A: While primarily designed for solar systems, the calculator can be adapted for other low-voltage DC applications.
  2. Q: How does cable size affect energy loss in a solar power system? A: Larger cable sizes result in lower resistance, reducing energy loss and improving overall system efficiency.
  3. Q: What factors impact cable resistance in solar cables? A: Cable resistance is influenced by the material (copper, aluminum) and the cross-sectional area (size) of the cable.

Conclusion: The Solar Cable Size Calculator is a valuable tool for individuals and professionals involved in designing solar power systems. Selecting the right cable size ensures optimal energy transmission and system performance, contributing to the overall efficiency of your solar setup.“`

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