Why Your Solar Panels Pass Every Test But Still Fail

Your voltage checks out. Your current checks out. The solar array is still underperforming. So what's actually wrong? In this video, we explore IV curve tracing, one of the most powerful diagnostic tools in solar PV. Learn how solar panels create a unique electrical fingerprint, how IV curves reveal shading, bypass diode failures, dirty panels, damaged modules, cabling faults and degradation, and why a simple voltage or current test often isn't enough. We also look at how Sungrow commercial and utility-scale inverters can perform IV curve tracing remotely using the iSolarCloud platform, helping maintenance teams identify faults before they even leave the office. From fault finding and performance analysis to predictive maintenance and warranty verification, this is one of the most useful solar tools you've probably never used. =============== Learn More About The Sungrow Offering: 👉 https://hub.efixx.co.uk/SungrowInverters Deep Dive Into Commercial Solar: 👉 https://youtube.com/live/Cv_RPLYwf-A =============== Time Stamps ⏱️ 00:00 Your Solar Array Is Underperforming 00:42 What Is An IV Curve? 01:38 Understanding ISC, VOC & Maximum Power Point 02:35 How Light & Temperature Change The Curve 03:50 Degradation vs Faults 04:50 What Happens In Strings & Arrays? 05:45 How Faults Distort The IV Curve 06:50 Why IV Curve Tracing Matters 07:40 Remote IV Curve Tracing With Sungrow 08:50 Real Fault Examples & Diagnostics 09:35 Final Thoughts =============== #solarenergy #solarmaintenance #solarpanels