Isolation Fault PV — PV Isolation fault

What does 121 mean?

The inverter has detected that the solar panel array is not properly isolated from the ground. This is a serious safety issue due to potential electrical shock hazards.

• Poor insulation in the PV wiring
• Ground leakage in the solar array
• Faulty components in the PV installation

Click steps to track your progress.

1. 1

   Check the PV installation for any isolation problems or ground leakage.

2. 2

   A certified PV installer must fix any faulty strings before connecting them to the inverter.

3. 3

   Refer to the application note on isolation fault troubleshooting for more details.