Tradvolt › Process & SOP Library › Grid-Tie Witness Test (CN→HU)
Document type: Standard Operating Procedure (SOP) | Scope: Tradvolt vertical LFP battery energy storage systems (model family TVT-VLFP-215K, 215 kWh / 100 kW per cabinet, paired with a Sungrow SC125HV PCS skid) shipped from China to Hungary. | Document ID: TVT-SOP-GTW-04 | Revision: 1.3 | Effective: 2026-09-21
Decision: Total on-site duration 5 working days (Day 0 → Day 5). Mandatory gate: a Hungarian DSO Engineer must be physically present on Day 4 to countersign the synchronization record before the PCS may parallel with the grid; no parallel operation without DSO signature. Acceptance: round-trip efficiency ≥ 92% at 0.25C / 0.5C / 1C and voltage/frequency ride-through per IEC 61727:2004 Cl. 6.3 and MSZ EN 50549-1:2019 §5.2 / §5.4. Equipment: TVT-VLFP-215K battery cabinet + Sungrow SC125HV PCS skid. Location: Hungary (DAP site). Horizon: 5 working days on site. Evidence date: 2026-09-21. Limitation: the witness-test checklist PDF (assets/TVT-GTW-VLFP215K_Checklist_Rev1.pdf) and the RFQ path (/rfq/) are the two live CTAs on this page; both lead to existing Tradvolt site assets. Cost figures are explicitly model assumptions pending a formal quote.
| Field | Value |
|---|---|
| Decision | 5 working days on site, Day 0 → Day 5 |
| Mandatory gate | Hungarian DSO Engineer countersignature on Day 4 before grid paralleling |
| Acceptance — efficiency | Round-trip efficiency ≥ 92% at 0.25C / 0.5C / 1C load steps |
| Acceptance — grid compliance | IEC 61727:2004 Cl. 6.3 + MSZ EN 50549-1:2019 §5.2 / §5.4 |
| Equipment family | TVT-VLFP-215K (Tradvolt vertical LFP cabinet) + Sungrow SC125HV PCS skid |
| Location | Hungary, DAP site (CN→HU corridor) |
| Horizon | 5 working days on site |
| Evidence date | 2026-09-21 |
| Limitation | Cost figures are model assumptions; final per-project quote issued via RFQ |
Scope: Tradvolt vertical LFP battery cabinets, model family TVT-VLFP-215K (215 kWh nominal, 100 kW PCS, 768 V nominal DC, 614–864 V operating window), shipped along the CN→HU logistics corridor and cleared DAP to the named Hungarian site. Witnessing is required by the local DSO (typically E.ON Áramhálózat / MVM) before commercial operation. The sync/gateway references used in this SOP are IEC 61727:2004 §6.3 (Synchronization) and §6.4 (Power quality) per the IEC webstore publication record, and MSZ EN 50549-1:2019 §5.2 (connection to LV distribution network) and §5.4 (frequency and voltage operating ranges). Limits/curves referenced in §3–§4 are taken from the OEM Service Manual TVT-VLFP-215K family, Rev. 3.4, 2026.
[Claim | Src: IEC 61727:2004, Cl. 6.3 "Synchronization" & Cl. 6.4 "Power quality" | URL: https://webstore.iec.ch/publication/6005 | accessed 2026-09-21] [Claim | Src: MSZ EN 50549-1:2019 §5.2 / §5.4 (Hungarian adoption of EN 50549-1) | URL: https://www.mszt.hu/en/standard/msz-en-50549-1-2019 | accessed 2026-09-21] [Claim | Src: Tradvolt Vertical LFP OEM Service Manual, TVT-VLFP-215K family, Rev. 3.4, 2026, §4.7 Performance Verification | URL: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21]
The witness test covers mechanical integrity, electrical safety, inverter synchronization with the Hungarian grid, and measured performance against the contractual guarantees. Witnessing is performed jointly by the Customer Representative, the local utility/DSO engineer, and the OEM Service Engineer.
| Step # | Action | Owner | Input doc | Output doc | Done-when / OEM limit |
|---|---|---|---|---|---|
| 1 | Receive pre-arrival file: FAT report, packing list, customs docs, datasheet. | Project Engineer | Shipment file pack | Pre-arrival review log | All four documents reviewed and indexed in project folder. |
| 2 | Visual inspection & unpacking at site, compare to packing list, photo-document any transit damage. | Logistics Coordinator | Packing list, CMR/waybill | Unpacking & damage report | Damage report countersigned by Customer Representative; no unmarked cartons remain. |
| 3 | Mechanical installation check: rack anchoring, torque marks, cable clearances. | Site Supervisor | OEM layout drawing | Mechanical check sheet | Rack-to-floor anchor torque verified at 120 N·m ± 10 N·m (M12 grade 8.8) per OEM Service Manual TVT-VLFP-215K Rev. 3.4 §3.4 "Mechanical Anchoring". [Src: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21] |
| 4 | DC & AC cabling verification: cross-section, lugs, torques, labelling. | Electrical Lead | Single-line diagram | Cabling verification sheet | DC bus-bolt torque at the TVT-VLFP-215K power terminals verified at 35 N·m (M10) per OEM Service Manual Rev. 3.4 §3.6 "DC Busbar Assembly". AC lug torque at the Sungrow SC125HV PCS skid AC terminals verified at 25 N·m per the SC125HV installation manual. [Src: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21] |
| 5 | Pre-energization safety checks: insulation resistance (1 kV DC), earth continuity, interlock function. | Safety Officer | OEM safety checklist | Pre-energization test record | Insulation resistance ≥ 1 MΩ per kV of nominal DC voltage (i.e. ≥ 768 MΩ at 768 V) per OEM Service Manual Rev. 3.4 §3.9. Interlock trip verified at cabinet door and PCS door. [Src: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21] |
| 6 | Commissioning power-on: cabinet energization, BMS link, OEM boot sequence. | OEM Service Engineer | OEM Service Manual Rev. 3.4 | Commissioning log | BMS pre-charge to DC bus 768 V ± 5% (730.6–805.4 V) before main contactor close; SOC window initialized at 45% ± 5% per OEM Service Manual Rev. 3.4 §4.2 "Initial State-of-Charge". Firmware version TVT-BMS v3.4.7 logged. [Src: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21] |
| 7 | Grid-tie witness test execution: synchronization, soft-start ramp, paralleling. | Utility Engineer (witness) + OEM Service Engineer | MSZ EN 50549-1 §5.4, IEC 61727 §6.3 | Grid-tie witness test report | Sungrow SC125HV PCS skid synchronizes at 400 V AC ± 10%, 50 Hz ± 0.2 Hz, voltage phase-angle ≤ ±10° per the SC125HV datasheet and OEM Service Manual Rev. 3.4 §4.5 "Synchronization Limits". DSO Engineer signs the synchronization record — this is the mandatory gate. [Src: https://www.sungrowpower.com/-/media/sungrow/media/en/products/pv-inverter/utility-sc/sc125hv-datasheet-en.pdf | accessed 2026-09-21] [Src: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21] |
| 8 | Performance verification: round-trip efficiency, reactive power response, thermal baseline. | Test Engineer | Contractual performance table | Performance test sheet | Round-trip efficiency ≥ 92% at 0.25C / 0.5C / 1C; SOC operating window enforced at 10%–95% (never below 5% / never above 98% — hard limits) per OEM Service Manual Rev. 3.4 §4.7. Cell temperature window 15–40 °C; thermal baseline recorded via FLIR T540. [Src: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21] |
| 9 | Defect punch-list closure: compile items, agree owners, set deadlines. | Project Engineer | All prior records | Punch-list register | Each item assigned an owner and a target close date; sampling of repeated defects per ISO 2859-1:1999 §9 (AQL). [Src: https://www.iso.org/standard/1141.html | accessed 2026-09-21] |
| 10 | Sign-off & handover: walk-through, training, document handover, warranty start. | Customer Representative + OEM Service Engineer | Punch-list register | Signed acceptance certificate | Acceptance certificate signed; warranty clock starts at the timestamp of the Day 5 signature. |
| Phase | Day | Predecessor | Notes |
|---|---|---|---|
| Pre-arrival review | Day −7 to −3 | Shipment booked | Remote review, no site travel required. |
| Reception & mechanical install | Day 0 to 1 | Customs cleared (DAP site, Hungary) | Driven by transit arrival from CN; rack anchor torque step (see §3 step 3). |
| DC/AC cabling | Day 1 to 2 | Mechanical install accepted | DC busbar and PCS AC torque steps (see §3 step 4). |
| Pre-energization safety checks | Day 2 | Cabling complete | Mandatory gate before energization; insulation ≥ 1 MΩ/kV. |
| OEM commissioning | Day 3 | Pre-energization passed | OEM Service Engineer on site; BMS pre-charge to 768 V ± 5%, SOC init 45% ± 5%. |
| Grid-tie witness test | Day 4 | Commissioning complete, DSO confirmed | DSO presence mandatory; synchronization per IEC 61727 §6.3 and SC125HV limits. |
| Performance verification & punch-list | Day 4 to 5 | Witness test passed | RTE ≥ 92% at three load steps; thermal baseline 15–40 °C. |
| Sign-off & handover | Day 5 | Punch-list agreed | Acceptance certificate signed; warranty clock starts. |
Files are exchanged through the Tradvolt secure project portal. Literal filenames:
TVT-FAT-VLFP215K_FATReport_Rev3.pdfTVT-PKL-VLFP215K_PackingList_CN-HU.xlsxCMR-Waybill_CNHU-VLFP215K.pdfTVT-DAT-VLFP215K_Datasheet_EN.pdf (battery cabinet) and the Sungrow SC125HV PCS skid datasheet at https://www.sungrowpower.com/-/media/sungrow/media/en/products/pv-inverter/utility-sc/sc125hv-datasheet-en.pdfTVT-SLD-VLFP215K_SingleLineDiagram_Rev1.dwgTVT-MEC-VLFP215K_MechanicalCheckSheet.xlsxTVT-CBL-VLFP215K_CablingVerificationSheet.xlsxTVT-SAF-VLFP215K_PreEnergizationTestRecord.pdfTVT-COM-VLFP215K_CommissioningLog.pdfTVT-GTWT-VLFP215K_GridTieWitnessTestReport.pdfTVT-PER-VLFP215K_PerformanceTestSheet.xlsxTVT-PNL-VLFP215K_PunchListRegister.xlsxTVT-ACC-VLFP215K_AcceptanceCertificate.pdfWitness-test checklist (printable PDF): TVT-GTW-VLFP215K_Checklist_Rev1.pdf (Tradvolt CDN; mirrored on this page alongside the RFQ CTA in §9).
The CN→HU corridor is cleared under DAP terms per the agreed Incoterms 2020 designation (seller bears cost and risk up to the named Hungarian place of delivery; see ICC Incoterms 2020 DAP rules A1–A10 / B1–B10). The Hungarian side uses the official EU TARIC consultation tool plus the NAV (Nemzeti Adó- és Vámhivatal) portal for national duty and VAT verification. Final duty and VAT figures must be confirmed by a licensed Hungarian customs broker at the time of import.
| Item | HS / TARIC code | Duty rate (HU) | VAT (HU) | Source / Portal |
|---|---|---|---|---|
| Lithium-ion battery cabinets (vertical LFP, stationary BESS, e.g. TVT-VLFP-215K) | 8507.60.00 (Lithium-ion accumulators for industrial stationary use) |
2.7% (EU conventional, third-country duty) — indicative; verify against TARIC measure row for 8507 60 00 at date of import | 27% standard (NAV) | EU TARIC consultation (search "8507 60 00"): https://ec.europa.eu/taxation_customs/dds2/taric/taric_consultation.jsp?Lang=en (accessed 2026-09-21). USITC HTS cross-check (search 8507.60.00): https://hts.usitc.gov/. |
| Battery management & control electronics (PCBs, BMS modules) | 8537.10.91 (Boards/panels for electrical control, ≤ 1,000 V) |
2.3% (EU conventional, third-country duty) — indicative; verify against TARIC measure row for 8537 10 91 | 27% standard (NAV) | EU TARIC consultation (search "8537 10 91"): https://ec.europa.eu/taxation_customs/dds2/taric/taric_consultation.jsp?Lang=en (accessed 2026-09-21). USITC HTS cross-check (search 8537.10.91): https://hts.usitc.gov/. |
| Power conversion system (PCS) skids / bidirectional inverters (Sungrow SC125HV) | 8504.40.95 (Static converters, other, ≥ 7.5 kVA) |
2.7% (EU conventional, third-country duty) — indicative; verify against TARIC measure row for 8504 40 95 | 27% standard (NAV) | EU TARIC consultation (search "8504 40 95"): https://ec.europa.eu/taxation_customs/dds2/taric/taric_consultation.jsp?Lang=en (accessed 2026-09-21). USITC HTS cross-check (search 8504.40.95): https://hts.usitc.gov/. |
| Spare parts packs (contactors, fuses, cables, connectors) | 8536.90.85 (Apparatus for switching/protecting electrical circuits, n.e.s.) |
2.3% (EU conventional, third-country duty) — indicative; verify against TARIC measure row for 8536 90 85 | 27% standard (NAV) | EU TARIC consultation (search "8536 90 85"): https://ec.europa.eu/taxation_customs/dds2/taric/taric_consultation.jsp?Lang=en (accessed 2026-09-21). |
NAV verification portal: https://nav.gov.hu/en (English homepage of the Hungarian National Tax and Customs Administration, accessed 2026-09-21).
Disclaimer: HS / TARIC classifications, EU third-country duty rates, and VAT figures shown above are indicative starting points based on EU conventional duty at the simulation date (2026-09-21) and depend on the exact customs declaration, certificate of origin, and any applicable EU preferential treatment (including current EU–China anti-dumping measures on lithium-ion cells — verify current status separately). Final duty and VAT figures must be confirmed by a licensed Hungarian customs broker at the time of import.
The table below lists the cost categories used in a typical Tradvolt CN→HU grid-tie witness test engagement for a TVT-VLFP-215K + Sungrow SC125HV PCS skid pair. All amounts are indicative model assumptions pending a formal quote — nothing is fixed until the offer is countersigned.
| Cost slot | Unit | Amount | Status |
|---|---|---|---|
| OEM Service Engineer, on-site day rate (5 days) | EUR / day | Model assumption: 1,400 EUR/day | Pending quote |
| Travel & accommodation, CN→HU round trip | EUR / trip | Model assumption: 2,200 EUR/trip | Pending quote |
| Calibrated test instrument rental (Fluke 435-II, Megger MIT420/2, FLIR T540) if not supplied by customer | EUR / day | Model assumption: 320 EUR/day | Pending quote |
| Hungarian DSO presence / utility fee (E.ON / MVM) | EUR / session | DSO-set, not Tradvolt-set | Confirm with local DSO at booking |
| Customs broker fee (one-off, per shipment) | EUR / shipment | Model assumption: 450 EUR/shipment | Pending quote |
| EU import duty & VAT (see §6) | % of CIF value | See §6; 27% VAT applied on (CIF + duty) per NAV | See EU TARIC & NAV at import date |
Any value outside OEM limits triggers a non-conformance entry in the punch-list register, an assigned owner, and a target close date agreed with the Customer Representative before sign-off. Sampling of repeated defects follows ISO 2859-1:1999 §9 (Acceptable Quality Level / AQL). [Claim | Src: ISO 2859-1:1999 §9 | URL: https://www.iso.org/standard/1141.html | accessed 2026-09-21] Any safety-related non-conformance (insulation resistance below the OEM Service Manual TVT-VLFP-215K Rev. 3.4 §3.9 limit, interlock failure, SOC excursion outside the 5%–98% hard limits, or DC bus voltage outside the 730.6–805.4 V window) blocks grid connection until closed. [Src: https://www.tradvolt.com/manuals/vertical-lfp-service-manual-rev-3-4.pdf | accessed 2026-09-21]
For a fixed-price quotation covering the on-site grid-tie witness test, OEM Service Engineer mobilization, and document handover for a TVT-VLFP-215K + Sungrow SC125HV PCS skid project, please use the Tradvolt RFQ form below. Standard reply window: 48 hours on business days.
Open the Tradvolt RFQ form — replies in 48h
Download the printable witness-test checklist: TVT-GTW-VLFP215K_Checklist_Rev1.pdf (the same printable checklist referenced in §5; RFQ form at /rfq/ remains the only CTA route for quote requests).