A consistent, well-documented inspection procedure is what separates catching delamination while it’s still a minor repair from discovering it only after a string has been underperforming for a year. This is a step-by-step procedure teams can apply consistently across an entire fleet.

Preparation: Timing and Conditions

Schedule inspections for early morning or late afternoon, when low-angle sunlight makes surface irregularities like bubbling or edge lifting far more visible than they are under direct midday light. If thermal imaging is part of the protocol, perform it while the array is under load and producing near its expected output for current conditions, since resistance-driven hotspots are far more detectable under active current flow than with the system idle.

Step 1: Visual Survey Under Raking Light

Walk the array systematically, viewing each module from a low angle relative to the sun position, looking specifically for bubbling, blistering, milky or cloudy patches, browning or yellowing, and any visible gap at the module edge. Photograph anything flagged, including a wide shot for location reference and a close-up for detail, building a documented baseline for comparison at the next inspection.

Step 2: Edge Seal Close Inspection

Because edge delamination is both the most common failure pattern and the most repairable if caught early, give the perimeter of each module particular attention — checking for cracking, shrinkage, or any visible gap in the edge sealant. A magnifying loupe is useful here; early-stage edge separation can be a fraction of a millimeter and easy to miss with the naked eye alone.

Step 3: Infrared Thermal Scan

Using a thermal camera or handheld infrared thermometer, scan each module or string for localized temperature differentials relative to the rest of the array under matched irradiance conditions. A meaningful hotspot correlating with a visually flagged area strongly suggests active delamination with rising electrical resistance at that location; a hotspot with no visible surface correlate may indicate delamination progressing beneath the surface. Teams building out thermal inspection capability for the first time can Email Us to discuss what equipment and interval fits their fleet size.

Step 4: String-Level Output Cross-Check

Compare each string’s current output against its historical seasonal-adjusted baseline and against other strings under matched conditions. A string underperforming its peers by more than expected, especially if the drop correlates with visual or thermal findings from Steps 1 through 3, confirms the physical inspection data with an electrical performance signal.

Step 5: Electroluminescence Imaging for Ambiguous Cases

When visual and thermal inspection results are inconclusive, EL imaging — typically requiring the module or string be taken offline briefly — provides definitive cell-level detail, revealing micro-cracks and inactive cell regions invisible to other inspection methods. This step isn’t necessary for every routine inspection but is valuable for confirming borderline cases before committing to a repair decision.

Step 6: Documentation and Trend Tracking

Log every finding — photographs, thermal readings, string output data — in a format that supports comparison across successive inspections, not just a snapshot of current condition. This trend data is what reveals whether a flagged area is stable, worsening, or improving after a repair, and it’s the evidence base needed for any manufacturer warranty claim.

Step 7: Severity Classification and Escalation Criteria

Classify each finding on a simple scale — no action needed, monitor at next inspection, schedule repair, or escalate to replacement assessment — using consistent criteria across the fleet: extent of the delaminated area, presence of moisture-related discoloration or corrosion, and measured electrical loss. This turns subjective judgment calls into a repeatable protocol that different inspectors can apply consistently.

Equipping Field Teams for Consistent Results

Inspection quality depends heavily on having the right basic equipment on hand for every visit: a magnifying loupe for close edge inspection, a handheld infrared thermometer or thermal camera, and a camera or smartphone capable of consistent close-up photography. Teams without dedicated thermal imaging equipment can still perform a reasonably effective inspection using the visual and string-level steps alone, escalating to a specialist visit with thermal or EL capability only when a finding warrants that closer look.

Building Inspection Findings Into Material Decisions

Understanding what’s actually happening at a chemical level when delamination is found — a failed adhesive bond, typically driven by the same thermal-cycling fatigue mechanism covered in how CTE mismatch causes adhesive bond failure — helps inspection teams select the right repair material when a finding does require action. Incure formulates UV-curable adhesive and coating chemistries used in exactly this kind of glass-to-substrate bonding application, and the Uni-Weld UV glass and metal bonder line reflects the viscosity and cross-linking density considerations relevant to long-term adhesion in these repair scenarios.

A disciplined, repeatable inspection procedure is the foundation of any effective delamination management program. Teams developing or refining their inspection protocol can Contact Our Team to discuss diagnostic approaches suited to their fleet.

Visit www.incurelab.com for more information.