Morningstar Ground Fault Protection Device

Morningstar RSC (EIA-485 to serial)

The Ground Fault Protection Device (GFPD) products are built to be both off-grid and on-grid PV safety devices. The GFPD is available in models, GFPD-150V & GFPD-600V, to support 150V and 600V PV system breaker stacks.

Morningstar’s GFPD increases safety and design flexibility in off-grid and on-grid PV systems. Ground fault protection is used in electrical systems to prevent current from following any unintended paths during a ground fault. It is critical to detect any stray current and to interrupt (break) the circuit until safe operation can be restored. A current imbalance between the conductors of a circuit indicates a ground fault. Morningstar’s GFPD will detect this condition and break the circuit on both the positive and negative legs. Disconnecting both poles ensures interruption of the ground fault current.

Features & Benefits

  • Works like a traditional AC GFI.
  • Maintains the integrity of earth bond for battery and loads.
  • Trips at lower fault current with greater accuracy.
  • Breaks both conductors in the faulted circuit and completely isolates PV source circuits.
  • Does not require an extra warning label at the battery as per U.S. National Electric Code requirements.
  • Provides design flexibility to meet a wide range of configurations:
  • Positive and negative ground.
  • Large and small arrays.
  • Makes it easier to locate and troubleshoot ground faults.
  • Is powered via the PV system’s battery.
  • Is equipped with both visual and audible alarms.
  • Is built to support both single controller and multiple controllers systems:
  • When the earth bond is not broken Morningstar’s GFPD will only shut off affected controller(s).
  • All loads will continue to operate safely with the battery remaining bonded to ground.
  • Multiple controllers and GFPDs can be added on an as-needed basis.