TradVolt › Guides › CN→IN Module Microcrack Inspection
Verdict: For a 1 MW-equivalent shipment of crystalline silicon PV modules (illustrative: LONGi Hi-MO 6 mono-PERC family, OEM manual rev. 2024-03; specific module line confirmed at RFQ) moving Shanghai (CNSHA) → Nhava Sheva (INNSA) on a ~25-day horizon (evidence date 2026-09-22), the recommended sequence is pre-shipment EL + visual + IEC 62446-1 electrical at origin, dossier handover at customs (HS 8541.40, BIS registration check, duty/cess PENDING lookup on ICEGATE), then arrival spot check. Acceptance requires zero EL-active microcracks, insulation resistance ≥ 40 MΩ·m² per IEC 62446-1, and a valid BIS registration number under IS 14286 / IS/IEC 61730 series on the bill of entry.
| Decision point | Outcome | Reference doc |
|---|---|---|
| Primary inspection modality | Electroluminescence (EL) imaging, dark-luminance method | IEC TS 60904-13 (IEC webstore catalogue) |
| Imaging documentation | Per infrared/EL imaging documentation requirements | IEC 62446-3 (IEC webstore catalogue) |
| Electrical safety tests | Insulation resistance + continuity, commissioning tests | IEC 62446-1 (IEC webstore catalogue) |
| Module safety qualification | PV module safety qualification framework applies | UL 61730-1 (UL Standards shop) |
| India market access | BIS registration under the crystalline silicon PV module scheme required at customs; no specific certificate number is endorsed here — buyer must verify against BIS portal for the exact module model | BIS registration portal |
| India customs classification | HS 8541.40 (photovoltaic cells); duty/cess PENDING lookup via ICEGATE HS code search | ICEGATE HS code search (path: Services → HS Code Search → 8541.40) |
| Incoterms / freight | Trade terms defined per ICC Incoterms 2020 | ICC Incoterms 2020 |
| Wood packaging (if pallets used) | ISPM 15 marking required | IPPC ISPMs list |
| RFQ handoff | Route to TradVolt RFQ endpoint (site path only) | /rfq/ |
This guide covers the maintenance workflow that Indian B2B buyers and Chinese OEMs apply to detect microcracks in crystalline silicon PV modules shipped across the China to India corridor. The illustrative equipment model referenced is the LONGi Hi-MO 6 mono-PERC family (datasheet page on LONGi); specific module SKU, OEM manual revision (rev. 2024-03 cited as illustrative; confirm at RFQ), torque/SOC/max-voltage limits are set by the OEM installation manual for that SKU and are not re-quoted here. The procedure is built around electroluminescence (EL) imaging as the primary diagnostic, with visual and electrical tests as supporting evidence.
| Step # | Action | Owner | Input doc | Output doc | Done-when |
|---|---|---|---|---|---|
| 1 | Receive pre-shipment documentation pack from OEM | Indian Buyer QC desk | OEM data sheet (e.g., LONGi Hi-MO 6 product page on longi.com/en), BoM, packing list | Document receipt log | All OEM docs filed and indexed |
| 2 | Schedule third-party EL imaging at origin warehouse | Inspection agency | Booking order, lot serial list | Inspection appointment confirmation | Slot confirmed with date and module count |
| 3 | Perform visual inspection on lot sample | Inspector | Visual checklist form | Filled visual report | All modules in sample visually cleared or flagged |
| 4 | Capture EL images per IEC methodology (dark-luminance) | EL technician | EL image log sheet | Raw EL image set | Image captured for every module in scope; method per IEC TS 60904-13 (IEC webstore) |
| 5 | Review images for cell-level defects | QC analyst | Raw EL image set | Defect classification sheet | Each module tagged pass / minor / fail against buyer-OEM threshold |
| 6 | Run insulation and continuity tests | Electrical tester | IEC 62446-1 form (insulation resistance + continuity) | Electrical test record | Insulation resistance (≥ 40 MΩ·m²) and polarity recorded per IEC 62446-1 (IEC webstore) |
| 7 | Compile inspection report | QC lead | Visual, EL, electrical outputs | Consolidated inspection dossier | PDF dossier signed and version-locked |
| 8 | Submit report to Indian buyer | Inspection agency | Consolidated inspection dossier | Acknowledgement from buyer | Buyer confirms receipt and acceptance |
| 9 | Coordinate customs clearance at IN port (HS 8541.40) | Customs broker | Inspection dossier, BIS registration lookup result, IEC/UL certs, shipping docs | Customs entry filing | Bill of entry filed; duty/cess value PENDING lookup on ICEGATE for 8541.40 |
| 10 | Track in-transit risk variables | Logistics coordinator | Carrier handling records | In-transit risk log | Container arrived without shock/humidity alert; trade terms per ICC Incoterms 2020 |
| 11 | Conduct arrival spot check | Indian warehouse QC | Statistical sampling plan (ISO 2859 family referenced for sampling procedures — see ISO 2859 search) | Arrival spot-check report | Sample EL re-imaging complete and compared to origin set |
| 12 | File RFQ or warranty claim | Buyer procurement | Inspection dossier, spot-check report | RFQ submission or warranty ticket | Action routed via /rfq/ |
OEM_datasheet_module_xxxxW.pdf — manufacturer specification sheet for the specific module model (illustrative: LONGi Hi-MO 6 from longi.com/en; specific SKU confirmed at RFQ).BoM_bill_of_materials.xlsx — supplier-issued component breakdown.Packing_list_lot_xxxx.xlsx — pallet and carton manifest with serial numbers.Visual_inspection_form_v3.pdf — filled visual checklist per module.EL_image_set_lot_xxxx.zip — raw EL images by serial number, captured per IEC TS 60904-13 method (catalogue: webstore.iec.ch).Defect_classification_sheet.xlsx — tagging of pass, minor, fail per module.Electrical_test_record_IEC62446-1.pdf — insulation and continuity record per IEC 62446-1 (catalogue: webstore.iec.ch).Consolidated_inspection_dossier_v1.pdf — signed, version-locked summary.BIS_registration_lookup_result.pdf — screenshot/print from the BIS portal (bis.gov.in) showing the registration status for the exact module SKU. No specific registration number is endorsed in this guide; verify on the BIS portal.IEC_UL_certificate_TUV.pdf — TUV or equivalent IEC/UL test certificate; for PV module safety see UL 61730-1 product page on shopulstandards.com UL 61730-1.Shipping_documents_bl_invoice.pdf — bill of lading and commercial invoice; trade terms per ICC Incoterms 2020.In_transit_risk_log.xlsx — container handling, humidity, and shock record.Arrival_spot_check_report.pdf — post-arrival re-inspection output.| Phase | Window | Milestone |
|---|---|---|
| Pre-shipment documentation | Day -10 to -7 | OEM data sheet and packing list received (e.g., LONGi Hi-MO 6 product page) |
| Origin EL imaging | Day -5 to -3 | Third-party EL inspection completed (IEC TS 60904-13 method) |
| Report compilation | Day -3 to -2 | Consolidated dossier signed |
| Sea freight CN to IN (CNSHA → INNSA illustrative) | Day 0 to +18 | Container in transit |
| Indian customs clearance (HS 8541.40) | Day +18 to +22 | Bill of entry filed; duty/cess value PENDING ICEGATE HS 8541.40 lookup; BIS registration verified on bis.gov.in |
| Arrival spot check | Day +22 to +24 | Sample re-inspection at warehouse (sampling per ISO 2859 family — see ISO 2859 search) |
| RFQ or warranty handoff | Day +24 to +25 | Action routed via /rfq/ |
Transit windows are indicative and depend on carrier schedule and port congestion. Reference: ICC Incoterms 2020 (iccwbo.org).
| Cost line | Indicative range | Source confidence |
|---|---|---|
| Third-party EL imaging per module | Indicative; varies by lot size — request quote at RFQ | UNCERTAIN — MODEL ASSUMPTION |
| Visual inspection per module | Indicative; bundled with EL — request quote at RFQ | UNCERTAIN — MODEL ASSUMPTION |
| Insulation and continuity test per module (per IEC 62446-1, catalogue webstore.iec.ch) | Indicative; bundled with inspection — request quote at RFQ | UNCERTAIN — MODEL ASSUMPTION |
| Indian customs duty and cess on HS 8541.40 | PENDING — lookup path: ICEGATE → Services → HS Code Search → 8541.40 (see icegate.gov.in) | PENDING ICEGATE LOOKUP |
| BIS registration fee | Indicative; confirm against current BIS fee schedule on bis.gov.in | UNCERTAIN — BIS PORTAL |
| Inland transport CN warehouse to port | Indicative; per freight quote | UNCERTAIN — MODEL ASSUMPTION |
| Sea freight CN to IN port (terms per ICC Incoterms 2020) | Indicative; per carrier quote | UNCERTAIN — MODEL ASSUMPTION |
| Arrival spot check per sample (sampling per ISO 2859 family — ISO 2859 search) | Indicative; per inspection quote | UNCERTAIN — MODEL ASSUMPTION |
All cost lines above are indicative. TradVolt does not publish firm pricing; final values are obtained from inspection agencies, OEMs, and freight forwarders at quote time. The customs duty/cess line is marked PENDING pending lookup on the ICEGATE HS code search for 8541.40.
Visual inspection cannot resolve sub-millimetre cell cracks. EL imaging applies forward bias current to the module and captures the emitted light from the cells, exposing microcracks as dark lines that are not visible to the eye. Method basis: IEC TS 60904-13 (catalogue: webstore.iec.ch; designate the standard as "IEC TS 60904-13, Edition as published on the IEC webstore").
IEC TS 60904-13 covers electroluminescence measurements of photovoltaic modules, and IEC 62446-3 covers the documentation of infrared and electroluminescence imaging for PV installations. Both are referenced on the IEC webstore catalogue at webstore.iec.ch.
Imported crystalline silicon PV modules must be registered under the applicable Bureau of Indian Standards (BIS) scheme. Customs requires the BIS registration status for the exact module SKU to be verified against the BIS portal (bis.gov.in); the registration number is per-licensee and per-model and is not specified generically in this guide — it must be looked up at bis.gov.in for the actual SKU. The underlying scheme aligns with the IS 14286 / IS/IEC 61730 series; no specific certificate number is endorsed here.
Classification is typically split into pass, minor, and fail based on crack length, position, and cell impact. Final acceptance thresholds (including any torque, SOC, or max-voltage limits) are set in the OEM installation manual for the specific module SKU — e.g., LONGi Hi-MO 6 family (see longi.com/en; confirm rev. 2024-03 or current at RFQ) — and in the buyer-OEM supply contract.
The buyer should open a TradVolt RFQ for remediation or replacement and reference the consolidated inspection dossier plus the spot-check report as supporting evidence. RFQ is routed via /rfq/.
Photovoltaic cells/modules are classified under HS heading 8541.40. The applicable basic customs duty, IGST, and any cess are PENDING lookup via the ICEGATE HS code search (path: ICEGATE → Services → HS Code Search → 8541.40 — icegate.gov.in); this guide does not publish a specific duty rate.
Trade terms (e.g., CIF Nhava Sheva) are defined by ICC Incoterms 2020. Wood packaging, if used, must meet IPPC ISPM 15 marking requirements.
Need inspection, remediation, or replacement modules across the CN→IN corridor? Submit your RFQ on TradVolt.
| Claim | Source | URL |
|---|---|---|
| EL imaging is the primary diagnostic for sub-millimetre cell cracks (dark-luminance EL) | IEC TS 60904-13 (Electroluminescence of PV modules) — IEC webstore catalogue | https://webstore.iec.ch/ (cite designation "IEC TS 60904-13" + edition as published) |
| Documentation of EL images follows IEC 62446-3 | IEC 62446-3 (Infrared and EL imaging documentation) — IEC webstore catalogue | https://webstore.iec.ch/ (cite designation "IEC 62446-3" + edition as published) |
| Insulation resistance (≥ 40 MΩ·m²) and continuity tests reference IEC 62446-1 | IEC 62446-1 (PV system commissioning tests) — IEC webstore catalogue | https://webstore.iec.ch/ (cite designation "IEC 62446-1" + edition as published) |
| PV module safety qualification framework (UL-listed reference) | UL 61730-1 Photovoltaic (PV) Module Safety Qualification — Part 1 | https://www.shopulstandards.com/ProductDetail.aspx?productId=UL61730-1 |
| Imported crystalline silicon PV modules require BIS registration under the applicable scheme; specific registration number/licensee is per-SKU and verified on the BIS portal (no specific number is endorsed in this guide) | BIS registration scheme for crystalline silicon PV modules — BIS portal (aligns with IS 14286 / IS/IEC 61730 series) | https://www.bis.gov.in/ |
| India customs classification HS 8541.40; specific duty/cess value is PENDING ICEGATE HS code search | ICEGATE HS Code Search → 8541.40 | https://icegate.gov.in/ (lookup path: Services → HS Code Search → 8541.40) |
| Trade terms (Incoterms 2020) apply to CN→IN freight | ICC Incoterms 2020 rules page | https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ |
| Wood packaging marking (if pallets used) | IPPC ISPM 15 (wood packaging) — ISPMs list page | https://www.ippc.int/en/core-activities/standards-setting/ispms/ |
| Statistical sampling at arrival spot check | ISO 2859 (sampling procedures by attributes) — ISO standards search | https://www.iso.org/search.html?q=2859 |
| Illustrative equipment model family (mono-PERC) referenced for this guide; specific module SKU + OEM manual revision to be confirmed at RFQ | LONGi Hi-MO 6 product page (landing page; SKU/datasheet rev. confirmed at RFQ) | https://www.longi.com/en/ |
| RFQ routing is handled via the TradVolt RFQ site path | TradVolt RFQ endpoint | /rfq/ |
| Cost lines are indicative only and require quote confirmation; customs duty/cess line is PENDING ICEGATE lookup | TradVolt process guide; ICEGATE for HS 8541.40 | This guide; https://icegate.gov.in/ |
| Document filenames are field templates issued by TradVolt | TradVolt document checklist (this guide) | Section: Document Checklist |
| Timeline windows are indicative and depend on carrier and port factors | TradVolt process guide | Section: Indicative Timeline |
| Verdict/dataset parameters (CNSHA → INNSA, ~25-day horizon, evidence date 2026-09-22, LONGi Hi-MO 6 illustrative SKU) | TradVolt editorial assumption | This guide — MODEL ASSUMPTION |