Uploaded February 2026 | Updated September 2026, 2 weeks ago
Ground faults can also be identified using traditional voltage testing methods when conductors can be safely isolated. In this video, we demonstrate how to measure open circuit voltage and use voltage to ground readings to estimate the approximate location of a fault within a PV string.
By dividing voltage to ground by the module open circuit voltage, technicians can calculate how many modules away the fault is located. This method requires careful isolation of strings and systematic testing at the combiner box to determine which circuit contains the ground fault.
While this manual approach can provide an approximate fault location, it involves multiple steps and calculations. The Fluke GFL-1500 simplifies this process by automating analysis and allowing technicians to trace the signal directly to the fault location using a receiver or clamp.
This video helps technicians understand both conventional voltage-based troubleshooting and how modern tools improve speed, safety, and accuracy in solar ground fault diagnostics.
Learn more: fluke.com/en-us/product/electrical-testing/best-solar-energy-industry-tools/fluke-gfl-1500
Ground faults can also be identified using traditional voltage testing methods when conductors can be safely isolated. In this video, we demonstrate how to measure open circuit voltage and use voltage to ground readings to estimate the approximate location of a fault within a PV string.
By dividing voltage to ground by the module open circuit voltage, technicians can calculate how many modules away the fault is located. This method requires careful isolation of strings and systematic testing at the combiner box to determine which circuit contains the ground fault.
While this manual approach can provide an approximate fault location, it involves multiple steps and calculations. The Fluke GFL-1500 simplifies this process by automating analysis and allowing technicians to trace the signal directly to the fault location using a receiver or clamp.
This video helps technicians understand both conventional voltage-based troubleshooting and how modern tools improve speed, safety, and accuracy in solar ground fault diagnostics.
Learn more: fluke.com/en-us/product/electrical-testing/best-solar-energy-industry-tools/fluke-gfl-1500
