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How to Properly Size Your Solar Cable for Your Next Solar Project

Incorrect cable sizing is one of the biggest silent killers of solar systems.
From voltage drop and power loss to overheating, melted insulation, and burnt breakers — most solar failures start with wrong wire size.

In this video, we break down how to properly size your solar cables using a simple formula and two practical rule-of-thumb methods that every installer and solar user should understand.

What You’ll Learn in This Video:
• Why cable cross-sectional area matters in solar installations
• The simple solar cable sizing formula explained in plain English
• How voltage drop affects inverter performance and battery life
• The two rule-of-thumb methods used by professionals on real projects
• Why calculated cable sizes sometimes look “too big” — and what to do
• How to choose between 2.5mm, 4mm, 6mm, and 10mm solar cables safely
• Common mistakes installers make that lead to overheating and system failure

Whether you’re:
• A solar installer
• An electrician transitioning into solar
• A homeowner planning a solar installation
• Or upgrading an existing system
This video will help you design safer, more efficient solar systems that last longer and perform better.