Low Array Insulation Resistance

What does 313 mean?

A major fault where the insulation resistance of the PV strings against ground is low, potentially due to a short circuit between strings and ground or installation in a permanently moist environment. This poses a safety risk and can lead to inverter shutdown.

• A short circuit between PV strings and the ground.
• The PV strings are installed in a permanently moist environment.

Click steps to track your progress.

1. 1

   Check the insulation resistance against the ground of the PV strings.

2. 2

   If a short circuit is detected, rectify the fault.

3. 3

   If the insulation resistance against the ground is less than the default value in a rainy environment, set the ISO value (refer to 7.2.9 Setting Protection Parameters).