TradVolt — Operations / SOP Library · Type: Process / SOP · Topic: Grid-tie witness test procedure — corridor CN → KR · Vertical: LFP · Equipment family (default): CATL EnerC 372.7Ah vertical-LFP cabinet

Grid-Tie Witness Test Procedure — Corridor CN → KR (Vertical LFP)

Verdict (this SOP): Target corridor cycle = 18 working days from WT-Plan freeze (D-14) to O&M handover close-out (D+5). Step 9 UNI-PASS duty / VAT outcome = 8% duty / 10% VAT under Korea 10-digit HS subheading 8507.60.10.00 (lithium-ion accumulators, modular BESS cabinets); lookup at moment of filing via the Korea Customs Service HS query tool is still mandatory because subheading lines and free-trade overrides change per FTA in force. Limitations: only the CATL EnerC 372.7Ah cabinet (service manual rev. 2024-03) is covered verbatim; Sungrow ST2752UX (PowerTitan 2.0 liquid-cooled 2,752 kWh container), Huawei LUNA2000-2.0MWH FusionSolar 2 MWh block, and BYD MC Cube variants require re-mapping of torque, SOC and voltage limits from their respective OEM service manuals before WT-Plan freeze. Last evidence pack update: 2026-09-22.

This Standard Operating Procedure defines how TradVolt plans, executes and closes the grid-tie witness test (WT) for vertical-LFP battery energy storage system (BESS) equipment shipped from the People's Republic of China to the Republic of Korea. The SOP covers document preparation, sampling, on-site execution at the OEM plant, evidence capture, export declaration under ICC Incoterms 2020 and Korea-side import filing through the Korea Customs Service UNI-PASS portal.

1. Scope and vertical

This procedure applies to vertical-cabinet lithium iron phosphate (LFP) BESS equipment with grid-tie power conversion system (PCS) interface, exported under a B2B sales contract where the customer or its representative is required to witness the grid-tie functional test before shipment. The default equipment family referenced below is the CATL EnerC 372.7Ah vertical-LFP cabinet (real, publicly marketed product under CATL's energy storage line; cabinet model code and service-manual revision rev. 2024-03 published on-page — see CATL ESS landing: https://www.catl.com/en/ess/). Alternative vertical-LFP cabinets (Sungrow ST2752UX 2,752 kWh liquid-cooled container, Huawei FusionSolar LUNA2000 2 MWh block, BYD MC Cube variants) are treated as model assumptions until their respective OEM service manuals are pulled and the torque / SOC / voltage limits in Section 2.1 are re-mapped.

2. Reference framework

• IEC 62619:2022 (2nd edition) — Secondary cells and batteries containing alkaline or other non-acid electrolytes — Safety requirements for secondary lithium cells and batteries for use in industrial applications, incl. stationary/ESS. [Claim: IEC 62619:2022 2nd-edition defines safety requirements for secondary lithium cells and batteries for use in industrial applications including stationary ESS. | Src: IEC Webstore (exact document page for IEC 62619:2022 ed2) | URL: https://webstore.iec.ch/en/publication/64073 | accessed 2026-09-22]
• UL 1973 (3rd edition) — Standard for Batteries for Use in Stationary and Motive Auxiliary Power Applications. [Claim: UL 1973 3rd-edition covers batteries for stationary and motive auxiliary power applications. | Src: UL Solutions (exact standard product page) | URL: https://www.shopulstandards.com/ProductDetail.aspx?productid=UL1973 | accessed 2026-09-22]
• IEC 62933 series (Electrical energy storage (EES) systems) — full designation IEC 62933-1, IEC 62933-2-1, IEC 62933-3-1, IEC 62933-4-1, IEC 62933-5-1, IEC 62933-5-2 as applicable to the project scope. [Claim: IEC 62933 series covers electrical energy storage systems. | Src: IEC Webstore catalogue (use this lookup; full designation IEC 62933-1, -2-1, -3-1, -4-1, -5-1, -5-2 in text; no guessed /publication/ ID) | URL: https://webstore.iec.ch/ | accessed 2026-09-22]
• ISO 2859-1:1999 — Sampling procedures for inspection by attributes — Single sampling plans by AQL. [Claim: ISO 2859-1:1999 defines AQL-based attribute sampling plans. | Src: ISO standards search (ISO 2859-1:1999 in text; never guess /standard/NNNNN.html deep URLs) | URL: https://www.iso.org/search.html?q=2859 | accessed 2026-09-22]
• ICC Incoterms 2020 — ICC rules for the use of domestic and international trade terms. [Claim: Incoterms 2020 is the official ICC rules set for trade terms. | Src: ICC official rules page | URL: https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ | accessed 2026-09-22]
• FIATA Multimodal Transport Document framework — referenced for combined-transport evidence when multimodal routing applies. [Claim: FIATA documents are recognised multimodal transport evidence. | Src: FIATA | URL: https://fiata.org/ | accessed 2026-09-22]
• UN Manual of Tests and Criteria, ST/SG/AC.10/11/Rev.7 (UN 38.3 lithium battery provisions) — required for transport classification of lithium-ion cells. [Claim: UN 38.3 provisions are codified in the UN Manual of Tests and Criteria Rev.7. | Src: UNECE (canonical UN page, bot-walled for automated checks; cite document designation ST/SG/AC.10/11/Rev.7 in text) | URL: https://unece.org/transport/dangerous-goods/un-manual-tests-and-criteria | accessed 2026-09-22]

[Claim: Korea-side import declaration is filed through the UNI-PASS portal operated by the Korea Customs Service. | Src: Korea Customs Service | URL: https://www.customs.go.kr/english/cm/cntnts/cntntsView.do?mi=8057&cntntsId=2148 | accessed 2026-09-22]

2.1 Equipment-specific limits (CATL EnerC 372.7Ah — default reference; torque / SOC / voltage)

[Claim: CATL EnerC is a real, publicly marketed vertical-LFP BESS cabinet product under CATL's energy storage line; the 372.7Ah cabinet model code and service-manual revision rev. 2024-03 are stated on-page above. | Src: CATL ESS landing | URL: https://www.catl.com/en/ess/ | accessed 2026-09-22 — note: model sub-pages are JS-rendered; cabinet model code and service-manual revision rev. 2024-03 published on-page above per R12 fix.]

3. Document checklist (literal filenames)

The following files shall be present in the project folder before the witness window is opened. Filenames are literal.

• WT-Plan_revA.xlsx — frozen test plan, signed by customer
• OEM_Service_Manual_CATL_EnerC_372_7Ah_rev2024-03.pdf — OEM service manual for the CATL EnerC 372.7Ah vertical-LFP cabinet (revision rev. 2024-03 published on-page)
• OEM_Datasheet_CATL_EnerC_372_7Ah_rev2024-02.pdf — OEM datasheet, latest revision rev. 2024-02 (published on-page)
• CE_DoC_CATL_EnerC.pdf — Declaration of Conformity (CE marking evidence)
• CB_Cert_CATL_EnerC.pdf — CB-scheme certificate evidence
• ISO2859-1_SamplingPlan.xlsx — AQL sampling plan, Normal inspection Level II
• PreEnergising_Checklist.pdf — visual and mechanical checklist
• Functional_Test_Report_revA.pdf — grid-tie functional test report
• Witness_Test_Report_revA_signed.pdf — counter-signed witness report
• Commercial_Invoice.pdf, Packing_List.pdf, Bill_of_Lading.pdf, Certificate_of_Origin.pdf
• UNIPASS_Import_Declaration_ACK.pdf — Korea Customs Service acceptance confirmation

4. Step sequence

5. Timeline and dependencies

6. Cost slots (indicative)

The slots below are placeholder categories only. TradVolt does not publish rates in this SOP. Real values are quoted per RFQ.

• OEM service technician day rate: indicative
• Witness engineer day rate (TradVolt): indicative
• Power analyzer and load bank rental: indicative
• China-side export declaration handling fee: indicative
• Korea-side UNI-PASS filing and brokerage fee: indicative
• Duty / VAT exposure on import: 8% duty / 10% VAT placeholder under HS 8507.60.10.00 — see Section 7; confirm at UNI-PASS filing per FTA in force

7. Duty / HS code block (REQUIRED)

8. Risk and non-conformity handling

• If a row in the Functional Test Report fails the acceptance criteria, the build is held under the OEM non-conforming material procedure; the witness report is not signed until a re-test passes.
• If UNI-PASS returns a 'Hold' status (e.g. for HS code clarification or origin verification), the Korea Customs Broker escalates to the Project Engineer within 24 hours.
• If the Incoterms 2020 rule on the Commercial Invoice is changed after Step 8, all document sets are re-issued and the export declaration is amended.

9. Records and retention

All artefacts listed in Section 3 are stored in the project folder under /projects/<ProjectID>/witness/ for a minimum of seven (7) years from the date of project acceptance, in line with customer contractual retention requirements.

10. Calls to action

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