Uploaded March 2026 | Updated September 2026, 1 week ago
The Fluke GFL-1500 Ground Fault Locator can be used in systems that include module level power electronics and rapid shutdown devices, but performance depends on how those devices behave when the inverter is turned off.
In this video, we explain how relays inside MLPE systems affect signal transmission. If the relays open when the inverter shuts down, the signal path is interrupted and tracing will not be effective. If the relays remain closed, the Fluke GFL-1500 can transmit signal through the circuit and allow fault location.
We also discuss the importance of confirming system behavior with the device manufacturer before testing. Understanding system architecture is critical before attempting ground fault tracing in MLPE environments.
This guidance helps technicians avoid wasted troubleshooting time and ensures compatibility when working on modern PV systems with rapid shutdown requirements.
The Fluke GFL-1500 Ground Fault Locator can be used in systems that include module level power electronics and rapid shutdown devices, but performance depends on how those devices behave when the inverter is turned off.
In this video, we explain how relays inside MLPE systems affect signal transmission. If the relays open when the inverter shuts down, the signal path is interrupted and tracing will not be effective. If the relays remain closed, the Fluke GFL-1500 can transmit signal through the circuit and allow fault location.
We also discuss the importance of confirming system behavior with the device manufacturer before testing. Understanding system architecture is critical before attempting ground fault tracing in MLPE environments.
This guidance helps technicians avoid wasted troubleshooting time and ensures compatibility when working on modern PV systems with rapid shutdown requirements.
