String 4 Abnormal

What does 109 mean?

A warning indicating that PV string 4 is performing abnormally, possibly due to long-term shielding or deterioration. This results in reduced power output from the specific string, decreasing overall system efficiency.

• PV string 4 has been shielded for a long time.
• PV string 4 has deteriorated.

Click steps to track your progress.

1. 1

   Check whether the output current of PV string 4 is significantly less than the output current of other PV strings.

2. 2

   If current is low, check whether PV string 4 is shielded by contaminants or obstructions.

3. 3

   If PV string 4 is clean and not shielded, check individual PV modules within string 4 for faults.