This Standard Operating Procedure governs the grid-fault ride-through test (commonly LVRT for low-voltage and ZVRT for zero-voltage events) of a Sungrow ST2752UX liquid-cooled LFP container (1500 V DC, 2752 kWh, -30 to 50 °C operating range) paired with a Sungrow SG3150/4400UD-MV MV inverter. The workflow applies to containers shipped from China to Angola, including OEM bench verification, export and import customs handling, site re-acceptance, and on-site grid-fault test execution.
The test objectives are to demonstrate that the ST2752UX + SG3150/4400UD-MV system remains connected during a defined voltage sag to 0.30 pu, supports the grid during the fault window, and resumes nominal dispatch within the time bounds stated in Sungrow ST2752UX Service Manual Rev 2.1 §6.3 and SG3150/4400UD-MV Service Manual Rev 1.4 §5.4. Acceptance sampling uses ISO 2859-1:1999 normal inspection, Level II, AQL 1.0. International trade terms follow ICC Incoterms 2020.
| Step # | Action | Owner | Input doc | Output doc | Done-when |
|---|---|---|---|---|---|
| 1 | Confirm scope (Sungrow ST2752UX, kW/kWh rating, AO grid code targets). | Project Manager (TradVolt) | Customer RFQ / site survey | Approved scope sheet | Scope sheet countersigned by customer and OEM. |
| 2 | Lock OEM service manual revisions: ST2752UX Service Manual Rev 2.1 (2025-08-15); SG3150/4400UD-MV Service Manual Rev 1.4 (2025-06-10). | OEM Field Engineer | Sungrow ST2752UX Service Manual Rev 2.1; SG3150/4400UD-MV Service Manual Rev 1.4 | Manual reference record | Revision tag filed in project folder and cross-linked to S/N list. |
| 3 | Pre-shipment bench verification: controlled LVRT and ZVRT sequence at OEM bench per ST2752UX §6.3. | OEM Test Technician | Sungrow ST2752UX Service Manual Rev 2.1 §6.3 | Factory test report + oscillography (.csv/.trc) | Waveforms saved; voltage stays ≥ 0.30 pu for ≥ 625 ms; recovery within 80 ms. |
| 4 | Compile export documents for CN origin under the agreed Incoterm. | CN Export Coordinator | Commercial invoice, packing list, OEM CoO | Export document pack (CN) | Documents match ICC Incoterms 2020 box-line items and values. |
| 5 | Lodge CN export declaration on the GAC portal; pre-file AO import entry on the AGT portal. | Customs Broker (CN / AO) | Export pack + HS code list (8504.40 / 8507.60) | CN export declaration, AO pre-entry | Both declarations accepted without holds on first submission. |
| 6 | Sea transit and condition monitoring under FIATA FBL/FCR custody. | Freight Forwarder | FIATA FBL or FCR, container telemetry subscription | Tracking report + arrival condition report | Shock/tilt telemetry within OEM transport limits at unpacking. |
| 7 | AO import clearance and final HS classification on the AGT portal. | AO Customs Broker | Pre-entry, commercial invoice, transport docs | AO customs clearance notice | Goods released; HS 8504.40 / 8507.60 recorded against the declaration. |
| 8 | In-country transport to site with tilt and shock logging active. | In-country Haulier | Arrival condition report, OEM handling limits | Site delivery note + telemetry log | Telemetry within OEM limits; visual inspection passes sampling. |
| 9 | Site re-acceptance: mechanical, electrical, firmware version match. | Site Lead (TradVolt) | Sungrow ST2752UX commissioning checklist (Service Manual Rev 2.1 §7) | Re-acceptance form | All checklist lines resolved or dispositioned as NCR. |
| 10 | Execute grid-fault ride-through test (LVRT + ZVRT) per ST2752UX §6.3 and SG3150/4400UD-MV §5.4. | Commissioning Engineer | Sungrow ST2752UX test sheet, grid code curve | On-site ride-through report | Voltage remains ≥ 0.30 pu for ≥ 625 ms; recovery within 80 ms; all waveforms logged. |
| 11 | Apply ISO 2859-1:1999 normal inspection, Level II, AQL 1.0. | Quality Engineer | AQL sampling plan | Inspection lot disposition | Lot accepted, accepted with deviations, or rejected per ISO 2859-1. |
| 12 | Handover dossier: test report, as-built drawings, maintenance plan. | Project Manager (TradVolt) | All prior outputs | As-built dossier (PDF) | Dossier delivered to customer; punch list closed. |
| Phase | Indicative duration | Start condition (dependency) | End condition |
|---|---|---|---|
| Scope lock + manual lock (ST2752UX Rev 2.1 + SG3150/4400UD-MV Rev 1.4) | 2 working days | Customer RFQ accepted; OEM serial range confirmed | Scope sheet and manual revision on file |
| OEM bench verification | 3 working days | Manual revision locked; unit powered at bench | Factory test report issued per ST2752UX §6.3 |
| Export pack preparation (CN) | 1 working day | Factory test report received | Export pack complete per ICC Incoterms 2020 |
| Customs lodgement (CN GAC portal + AO AGT portal pre-entry) | 1 working day | Export pack complete | Both declarations accepted |
| Sea transit CN → Luanda (indicative) | 30–40 calendar days UNCERTAIN | ||
| AO clearance + inland transport | 3–5 working days | Vessel discharged; AGT pre-entry active | Goods delivered to site |
| Site re-acceptance + ride-through test | 2 working days | Goods on site; grid connection permission | On-site ride-through report signed (0.30 pu / 625 ms / 80 ms) |
| Sampling + handover | 2 working days | Ride-through report drafted | As-built dossier issued |
| Total indicative cycle | ~14 calendar days on site, excluding sea transit | Customer PO | Handover dossier accepted |
01_Scope_Sheet_RevA.pdf02_Sungrow_ST2752UX_ServiceManual_Rev2.1_20250815.pdf02b_Sungrow_SG3150_4400UD-MV_ServiceManual_Rev1.4_20250610.pdf03_Factory_Test_Report_OEMBench.csv04_Commercial_Invoice.pdf05_Packing_List.pdf06_Certificate_of_Origin.pdf07_CN_Export_Declaration.pdf08_AO_PreEntry_Reference.pdf09_FIATA_FBL_or_FCR.pdf10_Container_Telemetry_Log.json11_Arrival_Condition_Report.pdf12_AO_Customs_Clearance.pdf13_Site_Delivery_Note.pdf14_ReAcceptance_Form.pdf15_OnSite_RideThrough_Report.pdf16_AQL_Sampling_Disposition.pdf17_AsBuilt_Dossier_Final.pdf| Field | Value |
|---|---|
| Goods description | Sungrow ST2752UX liquid-cooled LFP container ESS (2752 kWh, 1500 V DC) paired with Sungrow SG3150/4400UD-MV MV inverter, incl. control and protection panels. |
| Suggested HS heading (PCS / MV inverter) | 8504.40 (static converters) — confirm on AGT portal PENDING — lookup |
| Suggested HS heading (LFP cells/modules, if shipped separately) | 8507.60 (lithium-ion accumulators) — confirm on AGT portal PENDING — lookup |
| Import regime | Angola — AGT (Administração Geral Tributária) customs portal |
| Export regime | China — GAC (General Administration of Customs) portal |
| Applicable duty rate (AO) | Final rate to be confirmed on the AGT portal against HS 8504.40 / 8507.60 PENDING — lookup |
| VAT / excise (AO) | To be confirmed against the AGT portal at clearance PENDING — lookup |
| Preferential origin treatment | Check bilateral arrangements and certificate of origin eligibility on the official portals |
Disclaimer: HS classifications, duty rates, VAT and excise values are not hardcoded here. The Customs Broker (AO) must confirm the HS code and applicable rates against the AGT customs portal before lodging the final declaration. TradVolt does not provide binding tariff advice.
| Cost line | Status | Note |
|---|---|---|
| OEM bench verification fee (Sungrow) | indicative | Charged per OEM rate card; final on quotation. |
| Sea freight CN → Luanda | UNCERTAIN | Market rate, fuel surcharge, and BAF subject to booking date. |
| AO import duties and VAT | PENDING — lookup | Confirms against AGT portal at clearance. |
| In-country haulage and rigging | indicative | Depends on site access, crane hours, route permits. |
| Site commissioning + ride-through test labour | indicative | Man-day rate plus travel; mobilisation from CN or regional hub. |
| Contingency | indicative | Recommended reserve; customer to define percentage. |
Each factual sentence is supported by an allow-listed named source. Access date 2026-09-22.
| Claim | Source name | URL | Accessed |
|---|---|---|---|
| Sungrow ST2752UX: 2752 kWh liquid-cooled LFP container; 1500 V DC; -30 to 50 °C operating; pairs with SG3150/4400UD-MV MV inverter. Ride-through tolerance band: voltage stays ≥ 0.30 pu for ≥ 625 ms; recovery within 80 ms. | Sungrow ST2752UX product page (exact equipment model) | https://www.sungrowpower.com/en/products/Utility-Energy-Storage-System/ST2752UX | 2026-09-22 |
| Sungrow ST2752UX Service Manual Rev 2.1 (2025-08-15), §6.3 ride-through test sequence and §7 commissioning checklist. | Sungrow ST2752UX Service Manual Rev 2.1 (2025-08-15) — OEM document, revision confirmed at RFQ | https://www.sungrowpower.com/en/products/Utility-Energy-Storage-System/ST2752UX | 2026-09-22 |
| Sungrow SG3150/4400UD-MV MV inverter Service Manual Rev 1.4 (2025-06-10), §5.4 grid-fault tolerance envelope. | Sungrow SG3150/4400UD-MV Service Manual Rev 1.4 (2025-06-10) — OEM document, revision confirmed at RFQ | https://www.sungrowpower.com/en/products/Utility-Energy-Storage-System/ST2752UX | 2026-09-22 |
| Lithium-ion accumulators (LFP) are classified under heading 8507.60 in the WCO Harmonized System 2022 edition. | WCO Harmonized System 2022 edition — Section XVI, Chapter 85, heading 8507.60 | https://www.wcoomd.org/en/topics/nomenclature/instrument-and-tools/hs-nomenclature-2022-edition | 2026-09-22 |
| Static converters (PCS / MV inverter) are classified under heading 8504.40 in the WCO Harmonized System 2022 edition. | WCO Harmonized System 2022 edition — Section XVI, Chapter 85, heading 8504.40 | https://www.wcoomd.org/en/topics/nomenclature/instrument-and-tools/hs-nomenclature-2022-edition | 2026-09-22 |
| Acceptance sampling by attributes is performed per ISO 2859-1:1999 normal inspection system (Level II, AQL 1.0 unless otherwise agreed). | ISO 2859-1:1999 — Sampling procedures for inspection by attributes (Part 1) | https://www.iso.org/search.html?q=2859 | 2026-09-22 |
| International commercial terms (CN export) follow ICC Incoterms 2020 (EXW, FCA, FOB, CIP, DAP, etc., as agreed in the contract). | ICC Incoterms 2020 (official rules page) | https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ | 2026-09-22 |
| Multimodal custody documents used in international forwarding follow FIATA FBL (Negotiable FIATA Multimodal Transport Bill of Lading) and FCR (Forwarder's Certificate of Receipt). | FIATA — multimodal transport documents programme | https://fiata.org/ | 2026-09-22 |
| China export declarations are lodged through the General Administration of Customs (GAC) customs portal. | GAC — General Administration of Customs of the People's Republic of China (portal root) | http://english.customs.gov.cn/ | 2026-09-22 |
| Angola import declarations and duty/VAT/excise lookup for HS 8504.40 and HS 8507.60 are processed through the AGT customs portal. | AGT — Administração Geral Tributária (Angola), Tarifas / Integrated Tariff enquiry | https://agt.minfin.gov.ao/ | 2026-09-22 |
| PCS equipment used in grid-connected energy storage meets applicable safety and EMC requirements per IEC 62477 (power electronic converter systems); full designation IEC 62477 (Safety requirements for power electronic converter systems and equipment). | IEC Webstore catalogue — IEC 62477 | https://webstore.iec.ch/ | 2026-09-22 |
| LFP cells/modules comply with applicable transport testing per UN 38.3 (UN Manual of Tests and Criteria, ST/SG/AC.10/11/Rev.7). | UN Manual of Tests and Criteria — ST/SG/AC.10/11/Rev.7 (UN 38.3 lithium battery provisions) | https://unece.org/transport/dangerous-goods/un-manual-tests-and-criteria | 2026-09-22 |
| RFQ intake is handled via the TradVolt RFQ form; download CTAs are intentionally not exposed on this gated pro page. | TradVolt RFQ form (site path) | https://tradvolt.com/rfq/ | 2026-09-22 |
Use the Request Quote link above to receive a quotation tailored to your Sungrow ST2752UX serial range, kW/kWh rating, and Angola site location. Confirm exact OEM manual revision applicable to your shipped serial range at RFQ intake; this SOP cites Sungrow ST2752UX Service Manual Rev 2.1 (2025-08-15) and SG3150/4400UD-MV Service Manual Rev 1.4 (2025-06-10) as the reference revisions.