PV Module Reliability Testing: SE920, SE400 and SE910
A PV module reliability program can combine electrical characterization, imaging, controlled light exposure, environmental stress and safety tests. In TDM's published portfolio, SE920 explicitly lists steady-state IV and degradation testing, SE400 covers PVK MPPT testing, and SE910 covers light degradation. IEC 61215 / IEC 61730 are listed for SE920 and SE910; each model must still be evaluated against its own published specifications and the required test procedure.
The Full PV Module Test Sequence
A module qualification program is a sequence of electrical, visual, environmental and mechanical tests. Each test is designed to expose a specific failure mode before the module ever reaches a roof. The table below gives general qualification context; it is not a claim that every step is implemented by one TDM system:
| Test type | What it does | Typical equipment |
|---|---|---|
| IV performance (STC) | Pmax, Voc, Isc, FF at standard test conditions | IV curve tester |
| Electroluminescence imaging | Micro-cracks, broken fingers, dark spots, PID patterns | EL camera + bias source |
| Visual inspection | Surface defects, bubbles, edge sealing | Inline vision system |
| Wet leakage current | Insulation under moisture (IEC 61730) | Hi-pot / insulation tester |
| Thermal cycling / humidity freeze | Interconnect and lamination stress (IEC 61215) | Environmental chambers (3rd-party) |
| Mechanical load / hail | Frame and glass integrity (IEC 61215) | Load rigs (3rd-party) |
TDM product pages should be checked separately for each required test. SE920 publishes the illumination and sample environment for steady-state IV/degradation, while the current public data does not publish its electrical acquisition or report-output specifications.
IEC 61215 and IEC 61730: What the Standards Demand
Two standards define PV module qualification. They are often confused — the split is simple:
IEC 61215 Series: Design Qualification and Type Approval
IEC 61215-1 defines general test requirements and IEC 61215-2 defines test procedures, with technology-specific parts where applicable. The series evaluates design qualification for terrestrial modules intended for long-term outdoor operation; its results are not a quantitative prediction of module lifetime.
IEC 61730 Series: Safety Qualification
IEC 61730-1:2023 addresses construction requirements for safe electrical and mechanical operation. IEC 61730-2:2023 defines the test sequence used with Part 1 to assess risks including electric shock, fire and personal injury.
SE920 lists IEC 61215 and IEC 61730 in its public product data. That listing does not by itself define the electrical measurement range, correction method, calibration procedure or complete conformity scope; those details require configuration confirmation.
| Document | Test scope | Public product evidence | Boundary |
|---|---|---|---|
| IEC 61215 series | Terrestrial PV module design qualification and type approval | SE910 and SE920 product data list IEC 61215 | The public specifications do not document coverage of the complete test sequence or certification status |
| IEC 61730 series | PV module construction and safety qualification testing | SE910 and SE920 product data list IEC 61730 | The public specifications do not map individual construction or safety-test clauses to equipment |
| IEC TS 60904-13:2018 | PV module EL image capture, processing and interpretation | SE60, SE68, SE69 and SE80 publish EL/EPL functionality | Current product data does not list this Technical Specification or claim conformity |
| IEC 60904-1:2020 | Measurement of photovoltaic I–V characteristics | SE920 publishes steady-state IV functionality | Current product data does not list IEC 60904-1 or publish the required electrical acquisition details |
Published TDM Reliability Product Roles
The three public Reliability models address different parts of a test program. Their specifications should not be merged into one generic platform:
SE920: Steady-State IV and Degradation
Published data covers an A+A+A+ light source, 300–1200 nm spectrum, 200–1200 W/m² irradiance, 1200 × 600 mm samples and module temperature control. Electrical ranges, accuracy, sampling and output fields are not published.
SE400: PVK MPPT Testing
Published data covers an IEC 60904-9 Class A+ illumination environment, 350–1200 nm, 0.2–1.2 SUN and 1–100 s or continuous illumination. MPPT algorithm and electrical specifications are not published.
SE910: Light Degradation
SE910 publishes double-layer design, intelligent temperature control and adjustable irradiation power for light-degradation programs. Its public data does not list IV or MPPT measurement functionality.
Two Buying Motives, One Instrument Family
Nobody buys PV module testing equipment randomly — there are exactly two reasons:
| Certification-driven | Production-driven | |
|---|---|---|
| Goal | Type approval, market access | Yield, warranty avoidance |
| Frequency | New designs, requalification | Every module, every shift |
| Volume | Tens of modules | Tens of thousands |
| Key output | Certification dossier | Binning report + 100% EL record |
Use the test objective to select equipment, then verify the model against sample format, illumination, electrical range, acquisition, calibration and reporting requirements. Specifications remain model-specific across laboratory and production configurations.
Product Evidence and Configuration Gaps
The current product data supports a clear division of roles, but it does not publish every electrical or reporting field required for a complete PV module qualification workflow.
- SE920: steady-state IV/degradation role plus published solar-simulator, sample and temperature conditions.
- SE400: MPPT role plus published IEC 60904-9 illumination quality and monitoring conditions.
- SE910: light-degradation role with double-layer design and intelligent temperature control.
- Confirm before procurement: electrical ranges, accuracy, timing, channels, calibration, calculated outputs and data-export format.
TDM is part of the photovoltaic manufacturing solutions ecosystem — from film thickness measurement on the coating line to module-level electrical and imaging QA at the end of the line.
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Frequently Asked Questions
What is the difference between IEC 61215 and IEC 61730?
The IEC 61215 series addresses design qualification and type approval of terrestrial PV modules. The IEC 61730 series addresses PV module safety qualification: Part 1 covers construction requirements and Part 2 covers testing requirements. A product page listing either standard does not by itself establish equipment certification or complete test-sequence coverage.
What equipment is needed for PV module testing?
A complete plan can include electrical characterization, EL imaging, visual inspection, controlled light exposure, environmental chambers and mechanical or safety tests. In TDM's published Reliability range, SE920 covers steady-state IV/degradation, SE400 covers MPPT testing and SE910 covers light degradation; model-specific electrical and reporting requirements still need confirmation.
How long does a full IEC 61215 test sequence take?
Duration depends on the applicable IEC 61215 parts, module technology, selected sequence, preconditioning, stabilization, laboratory scheduling and any retesting. Confirm the exact edition, technology-specific part and test plan with the responsible laboratory instead of applying one generic duration.
Can inline testing replace certification testing?
No — they serve different purposes. Inline testing catches defects in the modules you are shipping today. Certification testing proves the module design itself is sound. A factory needs both: certification for the design, inline 100% inspection for the batch.
