Delamination is a fundamental failure of a solar module’s protective layers, and when it shows up, the warranty is the first line of defense for asset owners. Knowing how to build a claim before you file one determines whether it succeeds.
What Delamination Looks Like Inside the Module
A solar panel is laminated from a glass front sheet, an EVA encapsulant layer, the silicon cells, a second encapsulant layer, and a protective backsheet. Delamination occurs when the bond between these layers fails, letting air and moisture penetrate — typically starting at the panel edges or around the junction box and spreading inward. Manufacturers often try to categorize it as environmental wear and tear, but it is frequently rooted in material quality or a production defect, which matters directly for how a claim gets classified.
Root Causes Worth Documenting
Low-quality or under-cured EVA leaves weak chemical bonds that snap under heat and UV exposure. Poorly applied edge seals or a permeable backsheet let moisture in, which expands and contracts with temperature and physically pries the layers apart. Daily thermal cycling — panels can reach 65°C in direct sun and cool sharply at night — stresses bonds between materials with mismatched coefficients of thermal expansion. And EVA browning, a chemical reaction under UV and heat, releases acetic acid that accelerates bond failure further. Identifying which of these applies to your panels strengthens a defect argument over a wear-and-tear one.
Signs Worth Photographing During Inspection
Twice-yearly visual inspections should look for bubbles or blisters under the glass or backsheet, browning or yellowing around the cells, thin dark “snail trail” lines associated with moisture intrusion, a flaking or peeling backsheet, and foggy or condensation-streaked glass indicating a breached seal. Each of these is direct visual evidence a claims department will want to see.
Two Warranties, Two Different Claims
A product or workmanship warranty, typically running 10 to 25 years, covers manufacturing and material defects — delamination almost always falls here since it’s the adhesive bond itself that failed. A performance or power-output warranty, usually 25 years, guarantees a minimum output percentage of rated capacity over time; if delamination drags your output below that threshold, this is your second avenue, though manufacturers often insist on lab-controlled testing before honoring it.
Building a Claim That Holds Up
Document the evidence first: high-resolution photos of every affected panel, matched to serial numbers found on the frame or visible through the glass. Next, review your warranty terms closely for exclusions tied to installation environment — some manufacturers try to void coverage for panels installed in high-salt coastal or high-ammonia farming environments without specific certification. Where possible, run a performance test: monitoring software showing an output dip against neighboring panels, or third-party IV-curve testing and thermal imaging, provides objective proof the defect is causing measurable electrical loss. Finally, contact your installer if they’re still in business, or the manufacturer’s claims department directly, with your installation date, proof of purchase, and photo evidence ready. Email Us if your team needs help interpreting diagnostic imaging or documenting a suspected bond-failure defect.
Common Roadblocks and How to Answer Them
Manufacturers may argue edge delamination is normal wear that hasn’t affected performance — counter this with progression photos or a documented power drop. If the original manufacturer has gone out of business, your claim depends on whether a third-party insurance backer exists, which is why Tier 1 manufacturer selection matters at purchase time. Some manufacturers accept a defect on a handful of panels from a batch while disputing the rest, even when the whole batch shares the same failure risk — consistent monitoring and documentation across the full array helps counter this. And read the fine print on shipping and labor: many warranties cover the replacement module but not the soft costs of removal and reinstallation.
Reducing Future Claims at the Source
Avoiding a repeat of this process starts with specifying better materials up front. POE encapsulants resist moisture better than traditional EVA and don’t generate acetic acid as they age. Tedlar-based backsheets have a multi-decade field track record without delamination. And modules that have passed damp-heat qualification testing — 85°C at 85% humidity for 1,000-plus hours — are measurably less likely to delaminate in service. Incure’s UV-curable adhesives and sealants are formulated against the same thermal-cycling and moisture-ingress stresses that drive most delamination claims, the same durability logic behind choosing UV glue over epoxy for transparent, glass-facing bonds and managing CTE mismatch in any bonded assembly.
Delamination claims are won on documentation, not just on having a warranty. Photograph early, track the progression, understand which warranty type applies, and be ready to counter the “normal wear” argument with data. Staying ahead of the paperwork is what turns a defective module into a recovered cost rather than a permanent loss. Contact Our Team to discuss adhesive and encapsulant options that reduce delamination risk in new module designs.
Visit www.incurelab.com for more information.