GFDI Fuse Cleared or Missing

What does GFDI Fuse Open mean?

The Ground Fault Detection and Interruption (GFDI) fuse, located in the fuse holder on the circuit board of the Sunny Boy SB50US-80US-IUS094030, has cleared or is not present. This fuse is critical for protecting the PV system in the event of an array ground fault.

• Ground fault in the PV array, causing the fuse to clear (current greater than 1 Amp).
• GFDI fuse is not present in its holder.

Click steps to track your progress.

1. 1

   Troubleshoot the PV array thoroughly for ground faults before replacing the fuse.

2. 2

   Replace the GFDI fuse with a Littelfuse KLKD 1 Amp, 600V AC/DC type fuse.

3. 3

   Manually reset the inverter after replacing the fuse and clearing any ground faults.