IEC 61215: Solar Module Performance Testing Guide (2026)
IEC 61215 is the international standard series for the design qualification and type approval of terrestrial photovoltaic (PV) modules. It defines the test sequence a module must pass to demonstrate it can survive long-term outdoor exposure and deliver rated performance. This guide explains what the standard covers, the key test steps, and which metrology equipment supports each measurement stage.
What IEC 61215 actually covers
IEC 61215 is a performance and durability qualification standard. It is not a safety standard (that is IEC 61730, covered in a separate guide). The standard's goal is to verify that a module design is robust enough to be deployed in the field, by subjecting samples to accelerated stress and then confirming that their electrical performance has not degraded beyond defined limits.
The current edition of IEC 61215 was published in 2021, and it is structured as a series of parts covering different module technologies, including crystalline silicon (IEC 61215-1 series) and thin-film modules (IEC 61215-2).
The core qualification test sequence
A module undergoing IEC 61215 qualification passes through a defined sequence of tests. The most important measurement-intensive steps are:
| Test step | What it verifies | Metrology involved |
|---|---|---|
| Visual inspection | No visible defects after stress | Imaging, defect mapping |
| Maximum power determination | Rated power at STC | I-V curve measurement |
| Insulation test | Electrical integrity of module | Electrical safety |
| Temperature coefficient measurement | Power variation with temperature | I-V at multiple temperatures |
| NMOT (Nominal Module Operating Temperature) | Real-world operating temp | Thermal + I-V |
| Performance at STC and low irradiance | Behavior in weak light | I-V at low irradiance |
| Thermal cycling / damp heat / humidity freeze | Resistance to environmental stress | Post-stress I-V re-test |
| UV preconditioning | Resistance to UV exposure | Pre/post I-V comparison |
| Hot-spot endurance | Module survives localized heating | I-V + thermal imaging |
| Mechanical load / hail test | Structural robustness | Post-test I-V re-test |
| Light-induced degradation (LID) | Power loss after light exposure | Light soaking + I-V tracking |
A common thread runs through nearly every step: after each stress, the module's I-V characteristics are re-measured to check that power has not degraded beyond the allowed threshold. This is why accurate, repeatable I-V measurement is central to IEC 61215 compliance work.
Which TDM instruments support IEC 61215 test sequences
TDM Technology's reliability and durability test line is built around the measurement needs of PV module qualification:
- SE920 Steady-state IV & Degradation Tester: an A+A+A+ solar simulator (300-1200 nm, 200-1200 W/m²) for steady-state I-V characterization and degradation tracking. This is the workhorse instrument for the repeated I-V re-tests required after each stress step.
- SE910 Light Degradation Tester: for light-induced degradation (LID) testing, exposing modules to controlled illumination while tracking power loss over time.
- SE400 PVK MPPT Testing System: an A+A+A+ LED MPPT tester (IEC 60904-9, 0.2-1.2 SUN) for maximum-power-point tracking stability evaluation.
- SE60 EL/PL Mapping: electroluminescence and photoluminescence imaging used to detect micro-cracks, defects, and film non-uniformity after mechanical or thermal stress (aligned with IEC TS 60904-13 guidance).
- SE69 Hyperspectral EL/PL: hyperspectral EL/PL mapping for defect and uniformity analysis after mechanical or thermal stress.
Important: The presence of a standard reference on a product page does not establish equipment certification or complete test-sequence coverage. Qualification testing must be performed under a proper laboratory framework; these instruments support the measurement steps described above.
A practical note on the 2021 edition
The 2021 revision of IEC 61215 consolidated and updated test conditions, tightened some pass/fail criteria, and clarified the treatment of stabilized performance. If your module design was qualified under an earlier edition, review the 2021 changes with your certification body before re-submitting samples.
Frequently asked questions
Is IEC 61215 a safety standard?
No. IEC 61215 covers design qualification and performance. Safety qualification is covered separately by IEC 61730.
What is the difference between IEC 61215 and IEC 61730?
IEC 61215 verifies a module's performance and durability under environmental stress; IEC 61730 verifies its electrical and mechanical safety. Most modules need both.
How long does IEC 61215 qualification take?
The full sequence can take several months due to the duration of individual stress tests (e.g., damp heat, UV preconditioning).
Related standards
- IEC 61730: PV Module Safety Certification Guide
- PV Module Testing solutions
- IV Curve Testing topic page
