1. Scope

This SOP defines the pre-shipment packaging drop-test procedure applied to EV charging equipment (AC and DC EVSE, wallbox and pedestal form factors) — specifically the Huawei FusionCharge AC wallbox family, Sungrow IDC30E (30 kW DC fast charger), and Growatt EV Charger family — prior to dispatch from factories and consolidation hubs in the People's Republic of China to bonded warehouses, free-zone facilities, and project sites in the Kingdom of Thailand. [Claim | Src: Tradvolt SOP template (internal) — derived from IEC 61851-1:2017 Electric vehicle conductive charging system — Part 1: General requirements and IEC 60068-2-31 drop-test methodology | URL: https://webstore.iec.ch/en/publication/33644 | accessed 2026-09-22]

Drop testing serves two purposes: (a) verify that the transport pack — typically a double-wall corrugated carton with moulded EPE foam, edge protectors, and stretch-wrapped pallet — provides adequate protection to EVSE enclosures, internal PCBs, and connectors against mechanical shock encountered during cross-border road transport across Yunnan–Lao PDR–Nong Khai border crossings; and (b) generate the documented objective evidence required by the downstream consignee, Thai Customs, and any on-site installation contractor accepting delivery under CIP, DAP, or DDP Incoterms 2020 terms. [Claim | Src: ICC Incoterms® 2020 (ICC publication No. 723E) — official rules page | URL: https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ | accessed 2026-09-22]

2. Required Inputs (Named Sources)

#	Document / Source	Purpose
1	Huawei FusionCharge — OEM Service Manual (AC wallbox family); revision confirmed at RFQ per OEM datasheet revision register	Defines internal packaging requirements, max drop height, inspection criteria for the FusionCharge family. [Src: Huawei Digital Power — FusionSolar product portal \| URL: https://solar.huawei.com/en \| accessed 2026-09-22] [OEM manual revision: PENDING — confirmed at RFQ]
1b	Sungrow IDC30E — OEM Service Manual (30 kW DC fast charger); revision confirmed at RFQ per OEM datasheet revision register	Defines internal packaging requirements, max drop height, inspection criteria. [Src: Sungrow Power — product portal \| URL: https://www.sungrowpower.com/en \| accessed 2026-09-22] [OEM manual revision: PENDING — confirmed at RFQ]
1c	Growatt EV Charger family — OEM Service Manual; revision confirmed at RFQ per OEM datasheet revision register	Defines internal packaging requirements, max drop height, inspection criteria. [Src: Growatt — product portal \| URL: https://www.growatt.com/ \| accessed 2026-09-22] [OEM manual revision: PENDING — confirmed at RFQ]
2	IEC 60068-2-31:2008 — Environmental testing — Part 2-31: Tests — Test Ec: Drop and topple, primarily for equipment-type specimens	Test methodology reference. [Src: IEC Webstore catalogue — query IEC 60068-2-31 \| URL: https://webstore.iec.ch/en/products/?q=60068-2-31 \| accessed 2026-09-22]
3	ISO 2859-1:1999 — Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection	Determines sample size from lot. [Src: ISO standards search \| URL: https://www.iso.org/search.html?q=2859 \| accessed 2026-09-22]
4	ICC Incoterms® 2020 (ICC publication No. 723E)	Defines point of transfer of risk and cost. [Src: ICC \| URL: https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ \| accessed 2026-09-22]
5	FIATA — International Federation of Freight Forwarders Associations (corridor routing references and multimodal transport documents)	Cross-border CN→TH routing references. [Src: FIATA \| URL: https://fiata.org/ \| accessed 2026-09-22]
6	Thailand Customs Bureau — official portal (import documentation, HS classification)	Import documentation, HS classification portal. [Src: Thai Customs Bureau \| URL: https://www.customs.go.th/ \| accessed 2026-09-22]
7	China Customs — General Administration of Customs of China (GACC) — English portal	Export declaration, GACC commodity classification. [Src: GACC \| URL: http://english.customs.gov.cn/ \| accessed 2026-09-22]
8	WCO HS Nomenclature 2022 edition — international HS reference	International HS chapter/heading reference for Chapter 85 (Electrical machinery and equipment). [Src: WCO \| URL: https://www.wcoomd.org/en/topics/nomenclature/instrument-and-tools/hs-nomenclature-2022-edition \| accessed 2026-09-22]

3. Step Sequence

Step #	Action	Owner	Input doc	Output doc	Done-when
1	Confirm scope: confirm EVSE model family (Huawei FusionCharge / Sungrow IDC30E / Growatt EV Charger), lot size, packaging configuration, and destination (CN→TH).	QA Lead	Sales Order, OEM datasheet (named)	Job File (per shipment) `SOP-DT-JOB-{shipment-id}.docx` (template — {{shipment-id}} replaced with real shipment ID at use)	Job File signed by QA Lead and Logistics Coordinator within 24 h of order confirmation.
2	Verify applicable sources: confirm revision status of OEM service manual for the named family (Huawei FusionCharge / Sungrow IDC30E / Growatt EV Charger), IEC 60068-2-31:2008, ISO 2859-1:1999, Incoterms 2020 (ICC publication No. 723E).	Document Controller	Source register `SOP-DT-SRC.xlsx`	Source-verification note in Job File	Each named source revision stamped and dated in Job File.
3	Draw samples per ISO 2859-1:1999 AQL plan (General Inspection Level II unless otherwise specified).	QA Lead	ISO 2859-1:1999 AQL table; lot list	Sample selection record `SOP-DT-SAMPLE.csv`	Sample size recorded and witnessed by a second QA staff member.
4	Inspect packaging in unopened condition: carton, EPE foam, edge protectors, pallet, strapping.	Packaging Engineer	OEM packaging drawing/spec (per named family)	Pre-test inspection record	Checklist fully completed with no open items; photographs filed.
5	Determine drop height per OEM datasheet (Huawei FusionCharge / Sungrow IDC30E / Growatt EV Charger) and ISTA weight-class reference (typically 300 mm to 1 000 mm).	Packaging Engineer	OEM datasheet (named); ISTA reference	Test plan `SOP-DT-PLAN.html`	Drop height documented with units (mm); method of measurement noted.
6	Execute drop sequence: face, edge, corner — one drop per orientation per unit — using calibrated apparatus.	Test Technician (witnessed by QA Lead)	Test plan; calibration certificate	Drop test report `SOP-DT-REPORT.pdf`	All drops completed and recorded with timestamp, impact orientation, and deceleration value where measured.
7	Post-test functional and cosmetic inspection of EVSE per OEM service manual checklist for the named family.	QA Lead + Service Technician	OEM service manual (per named family)	Post-test checklist appended to report	Each checklist item ticked Pass / Fail / Conditional; any Fail triggers a non-conformance report.
8	Disposition: Pass, Conditional (rework), or Fail; produce Batch Release Note.	QA Lead	Drop test report + post-test checklist	Batch Release Note `SOP-DT-RELEASE-{lot-id}.pdf` (template — {{lot-id}} replaced with real lot ID at use)	Decision signed off by QA Manager; archive copy lodged in `/qa-archive/yyyy/mm/`.
9	Compile customs/commercial pack: HS-coded invoice, packing list, CoC, FIATA multimodal reference where applicable.	Logistics Coordinator	Thai Customs rules; Incoterms 2020; commercial documents	Customs file `CN2TH-CUST-{shipment-id}.zip` (template — {{shipment-id}} replaced with real shipment ID at use)	Every customs document present, no placeholder fields; HS code printed on invoice.
10	Final release for shipment under agreed Incoterms 2020 term (e.g., CIP Bangkok, DDP project site, DAP Nong Khai).	Logistics Coordinator (approved by Sales/PM)	Batch Release Note + customs file	Shipment release instruction	Carrier/forwarder acknowledgment received; departure timestamp logged.

4. Document Checklist (Templates — IDs populated at use)

SOP-DT-JOB-{shipment-id}.docx — Job File (per shipment) (template — {{shipment-id}} replaced with real shipment ID at use)
SOP-DT-SRC.xlsx — Source / reference register
SOP-DT-SAMPLE.csv — Sample selection (ISO 2859-1:1999)
SOP-DT-PLAN.html — Test plan with drop heights in mm
SOP-DT-REPORT.pdf — Drop test report (with calibration certificate reference)
SOP-DT-RELEASE-{lot-id}.pdf — Batch Release Note (template — {{lot-id}} replaced with real lot ID at use)
CN2TH-CUST-{shipment-id}.zip — Customs/commercial pack (template — {{shipment-id}} replaced with real shipment ID at use)
EVSE-OEM-SERVICE-MANUAL-{model-family}.pdf — OEM service manual for the named family (Huawei FusionCharge / Sungrow IDC30E / Growatt EV Charger); revision confirmed at RFQ (template — {{model-family}} replaced with family identifier at use)

5. Timeline & Dependencies

Phase	Day (relative)	Activity	Depends on	Owner
T0	D − 5	Order confirm + scope review	Sales order, OEM datasheet availability	Sales → QA Lead
T1	D − 4	Source / SOP verification	T0	Document Controller
T2	D − 3	Sample draw (AQL)	T1 + lot readiness	QA Lead
T3	D − 2	Drop test execution	T2 + calibrated equipment	Test Technician + QA Lead
T4	D − 1	Post-test inspection & disposition	T3	QA Lead + Service Technician
T5	D 0	Customs pack + release for shipment	T4 + Sales/PM approval	Logistics Coordinator

Indicative transit time CN→TH (land via Lao PDR): indicative 7–12 days from factory gate to Thai warehouse, depending on border processing. [Model assumption — UNCERTAIN; depends on Thai Customs processing windows. Cross-border routing references: FIATA | URL: https://fiata.org/ | accessed 2026-09-22]

Lead-times (customs clearance at Nong Khai / Chiang Rai): UNCERTAIN — depends on Thailand Customs processing windows and HS classification outcome. [Model assumption — Thai Customs Bureau | URL: https://www.customs.go.th/ | accessed 2026-09-22]

6. HS / Duty Block (REQUIRED — R5)

Field	Value
Equipment / parts	EV charging equipment (EVSE) — AC wallbox (Huawei FusionCharge family) and DC pedestal charger (Sungrow IDC30E 30 kW; Growatt EV Charger family), plus accessories (cables, mounting hardware, packaging)
Indicative HS code (AC wallbox)	PENDING — lookup (commonly explored range: Chapter 85 — Electrical machinery and equipment; heading 8538 / 8544 / 8504) on official Thai Customs and WCO HS Nomenclature 2022 edition portals
Indicative HS code (DC fast charger)	PENDING — lookup on official Thai Customs and WCO HS Nomenclature 2022 edition portals
Applicable duty rate (Thailand)	PENDING — lookup on official Thai Customs tariff portal
Applicable VAT (Thailand)	PENDING — lookup on official Thai Customs tariff portal
Official portal — Thailand	Thai Customs Bureau — customs.go.th [Src: Thai Customs Bureau — official portal \| URL: https://www.customs.go.th/ \| accessed 2026-09-22]
Official portal — China export	China Customs — english.customs.gov.cn [Src: General Administration of Customs of China — official portal \| URL: http://english.customs.gov.cn/ \| accessed 2026-09-22]
HS reference — international	World Customs Organization — HS Nomenclature 2022 edition [Src: WCO \| URL: https://www.wcoomd.org/en/topics/nomenclature/instrument-and-tools/hs-nomenclature-2022-edition \| accessed 2026-09-22]

Disclaimer: HS codes, MFN duty rates, FTA preferential rates (e.g., RCEP, ATIGA, ASEAN–China FTA), and Thai VAT rates must be confirmed against the official Thai Customs tariff and any applicable Free Trade Agreements before each shipment. Tradvolt does not hardcode rates; values are placeholders marked PENDING — lookup.

Pre-shipment Packaging Drop Test — CN→TH Corridor (EVSE)