PV systems can look fine while carrying hidden module damage, electrical faults, safety risks, or performance losses.

Start with the issue you need to solve.

What problem are you trying to solve?

Different problems require different evidence. The right inspection plan may combine visual inspection, EL testing, thermography, and electrical measurements to confirm what is happening at module, string, or system level.

What each inspection method can help find
Site issue or defect EL testing Thermography Visual inspection Electrical testing
Failed modules or strings
Failed substrings or defective bypass diodes
Cell cracks or cell breakage
Defective cell connectors
Finger faults
Insulation issues
PID
LeTID
TCO corrosion
Broken glass
Shading or soiling
Moisture ingress
Legend: ✓ = commonly used to identify or confirm    ◐ = may help, depending on conditions and inspection setup

Field inspection methods

  • Electroluminescence (EL) Testing

  • Infrared Thermography

  • IV Curve Tracing

  • Visual Inspection

  • Hidden electrical defect testing

  • BOS / Electrical Field Testing

Latest Field Inspection Insights

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