Breaking It Down: Kiwa PVEL Expands Test to Failure Methods for Assessing Module Breakage Risk

Why It Matters

By quantifying how far modules exceed standard design loads, the updated tests reduce procurement risk and enable more accurate engineering of tracker systems and warranty structures.

Key Takeaways

• SML‑TTF adds five samples, enabling statistical significance
• Hail‑TTF escalates hail size, targeting edge and corner failures
• New tests differentiate best‑in‑class modules beyond IEC pass/fail
• Utility‑scale trackers benefit from higher load tolerance data
• 2025 reliability scorecard showed 83% of manufacturers with failures

Pulse Analysis

The solar industry’s push toward larger‑area, lighter‑weight modules has outpaced the protective capacity of traditional glass thicknesses. As hailstorms become more intense in many regions, manufacturers face a growing mismatch between IEC/UL certification and real‑world durability. Kiwa PVEL’s updated Product Qualification Program (PQP) directly addresses this gap by introducing test‑to‑failure protocols that expose the true mechanical limits of a module’s bill of materials. By moving beyond binary pass/fail outcomes, the program offers developers a clearer picture of how new designs will survive extreme weather events.

The new Static Mechanical Load Test‑to‑Failure (SML‑TTF) subjects five samples per design to incremental pressure up to glass breakage, revealing the exact load at which failure occurs. Parallelly, the Hail‑TTF sequence starts with 35 mm ice balls for standard glass and escalates to 45 mm for thicker glass, concentrating impacts on edges, corners, and junction boxes. Expanding the sample pool from two to five units improves statistical confidence, while the progressive‑damage approach isolates dominant failure modes. Buyers can now rank modules by margin of safety rather than merely confirming compliance.

These enhancements arrive as the 2025 PV Module Reliability Scorecard reported that 83 % of manufacturers experienced at least one failure, a figure expected to rise in the 2026 edition. With quantifiable durability metrics, utilities and EPCs can fine‑tune tracker loads, insurance premiums, and warranty terms, reducing lifecycle risk. The industry may soon adopt test‑to‑failure data as a de‑facto benchmark, pressuring manufacturers to reinforce glass and frame designs. Kiwa PVEL’s move therefore not only aids procurement but also nudges the market toward more resilient solar installations.