CSLB C-46 Solar ContractorPhotovoltaic System InstallationHard
A solar technician is performing a visual inspection of a PV array. They observe significant discoloration and browning around the edges of several PV cells within multiple modules, particularly in areas prone to moisture. This condition, often accompanied by reduced power output, is most likely indicative of what type of degradation?
- APotential Induced Degradation (PID).
- BDelamination and moisture ingress.
- CMicro-cracking from hail damage.
- DLight Induced Degradation (LID).
Show answer & explanationAnswer & explanation
Correct answer: B. Delamination and moisture ingress.
Discoloration, browning, and delamination (separation of layers) around cell edges, especially in moist environments, are classic signs of moisture ingress attacking the encapsulant and adhesive layers, leading to reduced performance and potential cell corrosion.
Why the other options are wrong
- A. PID typically manifests as uniform power loss across the module, often without visible discoloration or browning at the edges.
- C. Micro-cracking from hail damage might not always be visible and typically doesn't cause widespread browning or delamination.
- D. LID is an initial power loss that occurs shortly after exposure to light, not typically associated with browning or delamination.
PV Module Delamination/Moisture Ingress
Degradation where the encapsulant layers separate from the glass or backsheet, allowing moisture to enter the module, leading to corrosion, browning, and power loss.
- Visible as discoloration, browning, or 'snail trails'.
- Often starts at module edges or defects.
- Accelerated by humidity and temperature cycling.
Memory trick: Degradation: PID, LID, Cracks, or Wet