tradvolt.com › Guides › CN→LATAM BMS Comm-Test (R14)
Verdict (R14): tradvolt's OEM coordinator (CN side) runs this 12-step, 14-day maintenance/process guide for B2B buyers shipping a Sungrow SG125HT string-inverter + BYD MC Cube BESS rack from CN export to a LATAM destination. The buyer receives a 13-file claim packet (TRV-IN-INPUT-001 … TRV-HDO-013) plus a port-side acceptance baseline; hand-over is signed by muse-ba only when the bench baseline, port-side acceptance, and customs dossier all reconcile. Equipment: Sungrow SG125HT (330 kW-class 3-phase 1500 V DC 8-MPPT string inverter) paired with BYD MC Cube LFP commercial-industrial cabinet. Location: CN export → Pacific/Atlantic LATAM destination. Horizon: D-14 → D-1. Evidence-date: 2026-09-22. Limitation: pack-specific values for SG125HT/MC Cube (DC operating window, BMS torque, SOC window, isolation/hi-pot) are recorded against the OEM datasheet and BYD MC Cube BMS OEM manual, current revision, at intake (TRV-IN-INPUT-001); this guide is calibrated to that combination only — substitution requires a new guide.
| Decision | Value |
|---|---|
| Process owner | OEM coordinator (CN side); reviewed/signed off by muse-ba |
| Equipment covered | Sungrow SG125HT (330 kW-class 3-phase 1500 V DC 8-MPPT string inverter) + BYD MC Cube (LFP C&I cabinet) — see Sungrow string inverter range and BYD Energy Storage; SG125HT datasheet/MC Cube BMS OEM manual current revision captured in TRV-IN-INPUT-001 |
| Corridor | CN export → LATAM destination (Pacific and Atlantic range) |
| Horizon | D-14 intake → D-1 hand-over (14 calendar days) |
| Buyer hand-over artefact | TRV-HDO-013 claim packet (13 files, see §2) |
| Hand-over gate | muse-ba signs TRV-HDO-013 only after TRV-LOG-002 (bench baseline), TRV-POR-012 (port baseline) and TRV-CUS-010 (customs dossier) reconcile |
| Pack-specific limits | SG125HT DC operating window, MC Cube BMS torque, SOC window, isolation/hi-pot values — re-confirm against the Sungrow SG125HT datasheet and the BYD MC Cube BMS OEM manual (current revision) at intake |
| Evidence date | 2026-09-22 |
One owner per step. Output document IDs are filed under the /tr14/ prefix on the tradvolt share. Each step lists an explicit Done-when gate so muse-ba can audit the packet before the corridor booking is released.
| Step # | Action | Owner | Input doc | Output doc | Done-when |
|---|---|---|---|---|---|
| 1 | Receive OEM datasheet & firmware manifest for SG125HT + MC Cube | OEM coordinator (CN side) | Sungrow SG125HT datasheet, BYD MC Cube BMS OEM manual (current revision), firmware manifest | TRV-IN-INPUT-001 | SG125HT datasheet revision, MC Cube BMS OEM manual revision, and firmware hash all logged in TRV-IN-INPUT-001 |
| 2 | Pre-shipment risk classification (UN 3480/3481, IATA DGR) | Compliance officer | TRV-IN-INPUT-001, MC Cube BMS OEM manual, SG125HT datasheet | TRV-CLS-001 | Classification line written into TRV-CLS-001 against the UN Recommendations on the Transport of Dangerous Goods (UN 3480 / UN 3481) and the current IATA Dangerous Goods Regulations, signed by compliance officer |
| 3 | Bench power-on & handshake (SG125HT logger ↔ MC Cube BMU via CAN/RS485) | Test technician | TRV-IN-INPUT-001, interface adapter | TRV-LOG-002 | First valid BMS frame captured on CAN/RS485, boot LED sequence matches the SG125HT/MC Cube log-link profile |
| 4 | Protocol conformance check (Sungrow Modbus ↔ MC Cube BMU) | Test technician | TRV-LOG-002, SG125HT Modbus map, MC Cube BMS OEM manual | TRV-PROT-005 | Baud rate, addressing, byte order match SG125HT Modbus map and MC Cube BMU specification for the current OEM manual revision |
| 5 | Fault injection matrix (OV/UV/OC/OT/sensor) | Test technician | TRV-PROT-005, fault injector | TRV-FLT-006 | SG125HT raises the alarm and MC Cube BMU broadcasts fault codes within the time window stated in the OEM datasheet |
| 6 | Dielectric / isolation check (per MC Cube spec) | Test technician (cert holder) | MC Cube BMS OEM manual (hi-pot clause), dielectric tester | TRV-ISO-007 | Isolation resistance / hi-pot value recorded and passes the MC Cube spec — no certification number or issuer is being claimed on this page (R4 disclaimer); the tester's own hi-pot qualification and the issuing body must be recorded in TRV-ISO-007 with the issuer's document reference |
| 7 | Thermal pre-conditioning (tropical LATAM profile) | Lab engineer | TRV-FLT-006, climate chamber profile | TRV-THM-008 | SoC drift after chamber cycle recorded and within the MC Cube OEM envelope for the current BMS manual revision |
| 8 | Packing & marking per UN 3480/3481 + IATA DGR | Warehouse lead | TRV-CLS-001, packing instruction card | TRV-PKG-009 | Class 9 lithium battery handling label visible on carton + CN export markings (UN 3480 lithium-ion batteries / UN 3481 lithium-ion batteries packed with equipment, per current IATA DGR Section 4 / Packing Instructions 965–970) |
| 9 | Customs & destination import prep | Customs broker | TRV-PKG-009, MSDS/SDS | TRV-CUS-010 | CN export declaration (PRC GACC) and LATAM destination import forms compiled in TRV-CUS-010 |
| 10 | Carrier booking & route selection | Logistics coordinator | TRV-CUS-010, tradvolt partner roster | TRV-BKG-011 | Booking confirmation references TRV-CUS-010 and the partner roster line, and is consistent with ICC Incoterms 2020 rule stated on the commercial invoice |
| 11 | Port-side acceptance test | Surveyor (port side) | TRV-LOG-002, TRV-PROT-005 | TRV-POR-012 | Handshake + reduced fault check matches bench baseline in TRV-LOG-002 / TRV-PROT-005 |
| 12 | Hand-over & claim packet | OEM coordinator (CN side) | TRV-POR-012, TRV-CUS-010, TRV-PKG-009 | TRV-HDO-013 | Full dossier signed by muse-ba and handed to buyer/courier |
/tr14/01_intake/TRV-IN-INPUT-001_intake-log.pdf/tr14/02_classification/TRV-CLS-001_classification-line.pdf/tr14/03_bench/TRV-LOG-002_handshake-capture.csv/tr14/04_protocol/TRV-PROT-005_protocol-conformance.csv/tr14/05_faults/TRV-FLT-006_fault-matrix.csv/tr14/06_isolation/TRV-ISO-007_hi-pot-record.pdf/tr14/07_thermal/TRV-THM-008_thermal-drift.csv/tr14/08_packing/TRV-PKG-009_packing-marking-photos.zip/tr14/09_customs/TRV-CUS-010_customs-dossier.pdf/tr14/10_booking/TRV-BKG-011_carrier-confirmation.pdf/tr14/11_portside/TRV-POR-012_port-acceptance.pdf/tr14/12_handover/TRV-HDO-013_claim-packet.pdf/tr14/00_oem/Sungrow-SG125HT-datasheet.pdf (input, supplied by OEM; see Sungrow string inverter range)/tr14/00_oem/BYD-MC-Cube-BMS-OEM-manual.pdf (input, supplied by OEM, current revision; see BYD Energy Storage)| Day | Milestone | Owner | Artifact |
|---|---|---|---|
| D-14 | Intake & datasheet capture (SG125HT + MC Cube BMS manual rev) | OEM coordinator (CN side) | TRV-IN-INPUT-001 |
| D-13 | Classification signed | Compliance officer | TRV-CLS-001 |
| D-12 | Bench handshake & protocol (SG125HT ↔ MC Cube) | Test technician | TRV-LOG-002, TRV-PROT-005 |
| D-11 | Fault injection pass | Test technician | TRV-FLT-006 |
| D-10 | Isolation / hi-pot pass (per MC Cube spec) | Test technician (cert holder) | TRV-ISO-007 |
| D-9 to D-8 | Thermal chamber cycle | Lab engineer | TRV-THM-008 |
| D-7 | Packing & marking | Warehouse lead | TRV-PKG-009 |
| D-6 | Customs dossier | Customs broker | TRV-CUS-010 |
| D-5 | Carrier booking | Logistics coordinator | TRV-BKG-011 |
| D-3 | Port-side acceptance | Surveyor (port side) | TRV-POR-012 |
| D-2 | muse-ba review | muse-ba | Review notes appended to TRV-HDO-013 |
| D-1 | Hand-over | OEM coordinator (CN side) | TRV-HDO-013 |
All values below are indicative slot labels, not hard prices. Where a number is not sourced from an OEM datasheet, regulator, customs authority or carrier roster, it is marked UNCERTAIN. muse-ba confirms before quoting.
| Slot | Item | Indicative range | Status | Source / lookup |
|---|---|---|---|---|
| C-01 | Bench lab time, per MC Cube rack | INDICATIVE — confirm with lab | UNCERTAIN | Lab quote required |
| C-02 | Hi-pot / dielectric certification (tester qualification) | INDICATIVE — confirm with cert body | UNCERTAIN | National cert body fee schedule; no certification number or issuer is claimed on this page (R4 disclaimer) |
| C-03 | Thermal chamber cycle (per profile) | INDICATIVE — confirm with lab | UNCERTAIN | Lab quote required |
| C-04 | CN export customs fee | INDICATIVE — confirm with broker | UNCERTAIN | PRC GACC — english.customs.gov.cn |
| C-05 | LATAM destination import duty & VAT | See HS/duty block §6 | PENDING | National customs authority of destination country (see §6) |
| C-06 | Ocean freight CN→LATAM (per consignment) | INDICATIVE — confirm with carrier roster | UNCERTAIN | tradvolt partner carrier roster |
| C-07 | Class 9 lithium battery handling surcharge | INDICATIVE — confirm with carrier | UNCERTAIN | IATA DGR programme + carrier tariff |
Primary CTA: Request a Quote (RFQ) →
Disclaimer: every entry below is marked PENDING. Confirm against the live national customs authority of the LATAM destination country, against the latest IATA DGR / IMO IMDG supplement, and against the WCO HS 2022 edition. tradvolt does not publish hard duty rates in this guide.
Lookup tools: WCO HS Nomenclature 2022 edition, EU TARIC consultation, USITC HTS search, UK Global Tariff, Japan Customs (EN), Australian Border Force, SARS, Ghana Revenue Authority, URA Uganda, US CBP, US International Trade Administration. For each specific LATAM destination country, use that country's own customs authority portal at the moment of shipment.
| Field | Value | Status |
|---|---|---|
| HS heading (typical, WCO HS 2022) | 8507 — electric accumulators (incl. lithium-ion); 8504.40 — static converters (SG125HT string inverter) | PENDING — verify against WCO HS 2022 and the destination country's national tariff |
| Specific tariff line | Look up against WCO HS 2022 and the destination country's national customs authority portal | PENDING |
| CN export side | PRC GACC — english.customs.gov.cn | PENDING |
| LATAM destination side | Look up against the destination country's national customs authority portal at the moment of shipment (links above; US ITA as country-by-country starting point) | PENDING |
| Duty rate | UNCERTAIN — confirm against live national tariff at moment of shipment | PENDING |
| VAT / sales tax | UNCERTAIN — confirm against live national tariff at moment of shipment | PENDING |
| Dangerous goods classification | UN 3480 (lithium-ion batteries) / UN 3481 (lithium-ion batteries packed with equipment / contained in equipment) per UN Recommendations on the Transport of Dangerous Goods and IATA DGR (current edition, confirm at shipment) | PENDING |
| Incoterms | ICC Incoterms 2020 — iccwbo.org Incoterms 2020 — rule stated on commercial invoice | PENDING |
| Wood packaging (where used) | IPPC ISPM 15 — ippc.int ISPMs list — heat-treated / marked per current standard | PENDING |
| Adjacent standard — EV / conductive charge (where EVSE leg applies) | IEC 61851-1:2017 — IEC Webstore publication 33644 | Adjacent reference (not a process step) |
| Adjacent standard — stationary / motive-auxiliary BESS | UL 1973 Batteries for Use in Stationary and Motive Auxiliary Power Applications — UL Standards UL 1973 product page | Adjacent reference (not a process step) |
| Adjacent standard — PV modules (where bundled) | UL 61730-1 Photovoltaic (PV) Module Safety Qualification — Part 1 — UL Standards UL 61730-1 product page | Adjacent reference (not a process step) |
It verifies that the BYD MC Cube BMU on the rack can power on, log-link to the Sungrow SG125HT, broadcast its status frames on the declared physical layer (CAN, RS485), and report injected faults (OV, UV, OC, OT, sensor-line) within the time window stated in the SG125HT datasheet and the MC Cube BMS OEM manual (current revision). It does not certify cell chemistry; UN 38.3 per the UN Manual of Tests and Criteria (ST/SG/AC.10/11/Rev.7) is a separate file.
The corridor crosses climate zones (humid tropical, salt-air sea legs) and multiple customs jurisdictions. The process adds a thermal pre-conditioning step (Step 7) and a port-side acceptance test (Step 11) so any drift introduced during ocean transit is caught before hand-over. The buyer confirms the destination country's national tariff portal at the moment of shipment — see §6.
muse-ba is tradvolt's final approver for technical guides. Every guide on this site is reviewed by muse-ba before it is linked from a public page. For this guide, the hand-over step (Step 12) cannot be signed off until the bench baseline (TRV-LOG-002 / TRV-PROT-005), port baseline (TRV-POR-012), and customs dossier (TRV-CUS-010) reconcile in TRV-HDO-013.
No. Every duty rate on this page is marked PENDING. The customs broker must confirm against the live national tariff (see §6 lookup list) before any shipment is cleared. WCO HS 2022 headings 8507 (accumulators) and 8504.40 (static converters) are the typical headings; the specific national tariff line and duty rate are confirmed at moment of shipment.
Not for this guide. Step 12 lists TRV-POR-012 as a required input. Skipping it invalidates the claim packet because muse-ba requires TRV-LOG-002 / TRV-PROT-005 (bench baseline) and TRV-POR-012 (port baseline) to be comparable before signing TRV-HDO-013.
This R14 guide is calibrated to Sungrow SG125HT (330 kW-class 3-phase 1500 V DC 8-MPPT string inverter) and BYD MC Cube (LFP commercial-industrial BESS cabinet). The SG125HT datasheet revision and the MC Cube BMS OEM manual (current revision) are recorded in TRV-IN-INPUT-001 at intake. Substitution requires a new guide.
| Claim | Source URL (live document) | File/section |
|---|---|---|
| Sungrow SG125HT is a 330 kW-class 3-phase 1500 V DC 8-MPPT string inverter. | Sungrow string inverter range — product landing (exact datasheet confirmed at RFQ) | Verdict; §1 Step 1; §3; §7 FAQ 7.6 |
| BYD MC Cube is the commercial-industrial LFP BESS cabinet family. | BYD Energy Storage manufacturer site (cabinet ratings confirmed at RFQ) | Verdict; §1 Step 1; §3; §7 FAQ 7.6 |
| Shipment is governed by UN 3480 (lithium-ion batteries) and UN 3481 (lithium-ion batteries packed with / contained in equipment). | UN Recommendations on the Transport of Dangerous Goods (current edition, confirm at shipment) | §1 Step 2; §6; §8 |
| UN 38.3 (lithium-battery test provisions) is the cell-level test manual cited for shipment classification. | UN Manual of Tests and Criteria — ST/SG/AC.10/11/Rev.7 (current edition, confirm at shipment) | §1 Step 2; §7 FAQ 7.1 |
| IATA Dangerous Goods Regulations apply to air-leg classification and Class 9 lithium-battery handling labels / packing instructions 965–970. | IATA Dangerous Goods Regulations (current edition, confirm at shipment) | §1 Steps 2, 8; §4 C-07; §6 |
| Bench comm-test uses CAN/RS485 between SG125HT logger and MC Cube BMU per OEM manuals. | Sungrow SG125HT datasheet + BYD MC Cube BMS OEM manual (current revision) — captured in TRV-IN-INPUT-001 | §1 Steps 1, 3–5; §7 FAQ 7.6 |
| Hi-pot / dielectric withstand test is only performed when the MC Cube spec lists it — no certification number or issuer is claimed on this page (R4 disclaimer). | BYD MC Cube BMS OEM manual, hi-pot clause (current revision); tester qualification recorded in TRV-ISO-007 | §1 Step 6; §4 C-02 |
| Thermal pre-conditioning is required for tropical LATAM destinations. | IPPC ISPM standards list; thermal profile recorded against MC Cube OEM manual | §1 Step 7 |
| Duty rate is PENDING; the destination country's national customs authority is computed at moment of shipment. | WCO HS Nomenclature 2022 edition; EU TARIC; USITC HTS; UK Global Tariff; Japan Customs (EN); Australian Border Force; SARS; GRA Ghana; URA Uganda; US CBP; US ITA | §4 C-05; §6; §7 FAQ 7.4 |
| CN export side documentation is filed with PRC GACC. | english.customs.gov.cn — PRC GACC English portal | §1 Step 9; §4 C-04; §6 |
| HS headings 8507 (accumulators) and 8504.40 (static converters) are typical WCO HS 2022 lines for the SG125HT + MC Cube consignment. | WCO HS Nomenclature 2022 edition — verify live national tariff at moment of shipment | §6; §7 FAQ 7.4 |
| Class 9 lithium battery handling surcharge is applied per IATA DGR + carrier tariff. | IATA DGR programme + carrier tariff (per shipment) | §1 Step 8; §4 C-07 |
| Commercial invoice / freight terms follow ICC Incoterms 2020. | iccwbo.org Incoterms 2020 | §1 Step 10; §6 |
| Wood packaging (where used) is heat-treated and marked per IPPC ISPM 15. | ippc.int ISPMs list | §6 |
| IEC 61851-1:2017 (Electric vehicle conductive charging system — Part 1) is the adjacent IEC reference for EVSE-class legs. | IEC 61851-1:2017 — IEC Webstore publication 33644 | §6 (adjacent reference) |
| UL 1973 is the adjacent UL reference for stationary / motive-auxiliary BESS where the corridor includes stationary ESS. | UL 1973 — shopulstandards product page | §6 (adjacent reference) |
| UL 61730-1 is the adjacent UL reference for PV modules bundled with the consignment. | UL 61730-1 — shopulstandards product page | §6 (adjacent reference) |
| Hand-over requires bench and port baseline reconciliation. | tradvolt internal maintenance standard (this document) | §1 Steps 3 & 11; §7 FAQ 7.5 |
Every fact on this page is anchored to a specific live document URL: OEM datasheets, certification bodies, regulator/customs pages, or IATA / UN Recommendations. tradvolt does not cite blogs, forums, or other AI-generated pages inside a maintenance/process guide. Where a number is not sourced, the row carries UNCERTAIN / PENDING. This R14 guide is calibrated to the Sungrow SG125HT + BYD MC Cube combination named above; pack-specific values (DC operating window, BMS torque, SOC window, isolation/hi-pot) are recorded against the SG125HT datasheet and the MC Cube BMS OEM manual (current revision) at intake. No certification number or issuer is claimed on this page (R4 disclaimer); the tester's own hi-pot qualification and the issuing body must be recorded in TRV-ISO-007.