TradVolt · Service Engineering

Anti-Islanding Protection Test — LFP, CN→PH Corridor

Standard Operating Procedure for the verification of anti-islanding behaviour on TradVolt vertical LFP battery systems prior to on-site commissioning, applicable to shipments moving on the China → Philippines (CN→PH) corridor.

1. Purpose and Scope

This SOP defines the procedure, acceptance criteria, documentation set, and trade-compliance references required to perform the anti-islanding protection test on TradVolt LFP battery systems installed in commercial and industrial sites on the CN→PH corridor.

• Equipment family: TradVolt LFP cabinet series TV-LFP-5K to TV-LFP-215K (51.2 V DC modules, 5 kWh to 215 kWh strings). The detailed procedure in this SOP applies to the TV-LFP-215K paired with a Sungrow SG125HT.
• Test objective: confirm inverter disconnection within the time limit defined by IEC 62116:2014 when the utility grid is de-energised.
• Exclusions: DC-side acceptance tests, fire-suppression verification, and IEC 62619 cell abuse tests are covered by separate SOPs.

2. Reference Documents and Standards

Claim	Source (full designation)	URL	Accessed
The anti-islanding test method for inverter-based resources is described in IEC 62116:2014 (Edition 2.0), including the requirement that the inverter ceases to energise the utility within 2 s of grid loss under specified load conditions. Use the IEC Webstore catalogue query — direct publication IDs are not guessable.	IEC 62116:2014, Utility-interface test procedures for inverter-based resources interconnected with low-voltage distribution networks	https://webstore.iec.ch/en/products/?q=62116	2026-09-21
The LFP battery cabinets covered by this SOP carry CE marking under the applicable EU directives; product conformity is verified through the manufacturer's Declaration of Conformity shipped with each cabinet. EU Battery Regulation (EU) 2023/1542 governs battery placement on the EU market.	Regulation (EU) 2023/1542 — EU Battery Regulation	https://eur-lex.europa.eu/eli/reg/2023/1542/oj	2026-09-21
UL 1973 is the standard for batteries used in stationary and motive auxiliary power applications; UL 9540 is the system-level energy-storage standard. Together they form the basis for system-level listing referenced for inverter functional-safety tests.	UL 1973, Batteries for Use in Stationary and Motive Auxiliary Power Applications	https://www.shopulstandards.com/ProductDetail.aspx?productid=UL1973	2026-09-21
UL 9540 is the standard for energy storage system safety; inverter anti-islanding is one of the functional-safety tests referenced for system-level listing.	UL 9540, Standard for Energy Storage Systems and Equipment	https://www.ul.com/services/energy-storage-system-testing-and-certification	2026-09-21
Sampling of received equipment for visual defects follows ISO 2859-1 normal inspection, AQL 1.0 for major and 2.5 for minor defects unless contractually amended.	ISO 2859-1:1999, Sampling procedures by attributes — Part 1	https://www.iso.org/search.html?q=2859	2026-09-21
Shipments from CN to PH are tendered under Incoterms 2020; the buyer- or seller-side obligation (commonly FOB, CFR, or CIF Manila) is recorded per contract and not redefined by TradVolt.	ICC Incoterms 2020 (ICC Publication No. 723E)	https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/	2026-09-21
Multimodal handover in Manila is documented through the FIATA multimodal transport waybill framework; transport documents are provided by the nominated freight forwarder.	FIATA Multimodal Transport Waybill (MTWB) documentation framework	https://fiata.org/	2026-09-21
Customs declarations on the Philippines side are filed through the Bureau of Customs Client Portal; tariff lines and duties are quoted by the licensed customs broker, not by TradVolt.	Philippines Bureau of Customs — e2m Customs Client Portal	https://clientportal.customs.gov.ph/	2026-09-21
HS nomenclature used to classify LFP cabinets and static converters on import follows the WCO Harmonized Commodity Description and Coding System, 2022 edition.	WCO HS Nomenclature 2022 edition	https://www.wcoomd.org/en/topics/nomenclature/instrument-and-tools/hs-nomenclature-2022-edition	2026-09-21
Lithium-ion cells used inside the cabinet are type-tested under the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria (UN 38.3).	UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria (UN 38.3, ST/SG/AC.10/11/Rev.7)	https://unece.org/transport/dangerous-goods/un-manual-tests-and-criteria	2026-09-21

3. Roles and Responsibilities

Role	Responsibility
Service Engineer (Lead)	Executes the test, signs the report, owns the checklist.
Commissioning Supervisor	Authorises energising, issues LOTO keys, reviews results, counter-signs.
Safety Officer	Confirms the safe work zone and PPE compliance.
Document Controller	Files the signed report and checklist in the project folder.
Forwarder / Customs Broker	Provides Incoterms-aligned transport docs and PH customs filing.

4. Step Sequence

Step #	Action	Owner	Input doc	Output doc	Done-when
1	Confirm scope, work order, and pre-conditions (weather window, isolation permit issued).	Service Engineer (Lead)	WO-XXX, ISO-45001 JSA	Pre-condition checklist signed	All 6 pre-condition items ticked.
2	Review the inverter section of the OEM service manual — Sungrow SG125HT Service Manual Rev. 1.4 — for the exact model in scope; record page numbers.	Service Engineer (Lead)	Sungrow SG125HT Service Manual Rev. 1.4	Manual page references logged	Manual page numbers recorded.
3	Prepare and calibrate the test instruments: AC source, RLC load, power analyser with valid calibration sticker.	Service Engineer (Lead)	Calibration register	Instrument readiness form	Sticker dates valid, warm-up complete.
4	Perform pre-test safety walk: PPE, LOTO applied, emergency stop tested, signage posted.	Safety Officer	Site Safety Plan	Safety walk card	All hazards closed or guarded.
5	Verify initial electrical state: DC open-circuit voltage within ±3 % of nominal; insulation resistance ≥ 1 MΩ between DC+ and PE and between DC− and PE. Confirm DC bus ≤ 1500 V per Sungrow SG125HT Rev. 1.4.	Service Engineer (Lead)	Battery commissioning sheet	Initial measurements log	Values recorded with units.
6	Execute the anti-islanding test per IEC 62116:2014: apply R, RL, RC, and RLC loads at 25 %, 50 %, 75 %, 100 %, 125 % of rated inverter output. Hold the cabinet SOC within 30 %–80 % per OEM manual.	Service Engineer (Lead)	IEC 62116:2014 test matrix	Trip-time data sheet	All 5 load points per phase captured.
7	Record trip times from each waveform capture with timestamp and load point.	Service Engineer (Lead)	Power analyser export	Trip-time data sheet	Maximum trip time ≤ 2.00 s.
8	Determine pass/fail against IEC 62116:2014 acceptance criteria; flag any anomaly.	Commissioning Supervisor	Trip-time data sheet	Pass/fail record	Supervisor counter-signature present.
9	Restore normal operating mode, clear LOTO, return the inverter to inverter-on-grid.	Service Engineer (Lead)	LOTO register	Restoration sign-off	LOTO padlock removed by owner.
10	Issue the final test report and archive it in the project folder; update the asset register.	Document Controller	Pass/fail record, waveforms	SOP-LFP-AIT-07 Report (PDF)	Report SHA-256 logged.

5. Acceptance Criteria

• Maximum measured disconnection time at any load point: ≤ 2.00 s per IEC 62116:2014.
• Insulation resistance prior to energising: ≥ 1 MΩ between DC+ and PE, DC− and PE.
• Open-circuit DC voltage deviation from nominal: within ±3 %.
• DC bus ≤ 1500 V during the test sequence (Sungrow SG125HT Rev. 1.4 maximum input voltage).
• Cabinet SOC held within 30 %–80 % throughout the test sequence (per OEM manual).
• Visual inspection: AQL 1.0 (major) / 2.5 (minor) per ISO 2859-1:1999 normal inspection.

6. Equipment, Tools, and PPE

Item	Specification	Quantity
AC source (grid simulator)	Programmable, 0–300 V AC, ≥ 10 kVA	1
RLC load bank	5 kW min, switched R/L/C steps	1
Power analyser	Class A, ≥ 1 kHz sampling	1
Insulation tester	1000 V DC, ≥ 1 GΩ range	1
Torque wrench (DC connector)	8 N·m calibrated (per Sungrow SG125HT Rev. 1.4)	1
PPE kit	Insulating gloves, arc-rated face shield, hearing protection	1 set per person

7. Document Checklist (filenames)

• WO-XXX_Anti-Islanding_Test_Request.pdf
• Pre-Condition_Checklist_LFP-AIT-07.pdf
• Manual_Reference_Log_Sungrow_SG125HT_Rev1-4.pdf
• Instrument_Readiness_Form.pdf
• Safety_Walk_Card.pdf
• Initial_Measurements_Log.xlsx
• Trip-Time_Data_Sheet.xlsx
• Pass_Fail_Record.pdf
• Restoration_Sign-Off.pdf
• SOP-LFP-AIT-07_Test_Report_v3.2.pdf

8. Corridor Timeline and Dependencies (CN → PH)

Phase	Activity	Dependency	Indicative duration	Slot
1	Factory acceptance (CN) — IEC 62116 bench report bundled with shipment	OEM test bench availability	Model assumption — confirmed per PO	Indicative
2	Export clearance (CN) — commercial invoice, packing list, certificate of origin	Forwarder appointment	Indicative 2–4 working days	Indicative
3	Sea transit CN→PH (e.g. Shanghai / Shenzhen → Manila)	Carrier schedule	Indicative 7–12 days	Indicative
4	Philippines customs clearance — broker filing via the Bureau of Customs Client Portal	Broker engagement	Indicative 3–7 working days	Indicative
5	Inland haulage and site delivery	Site readiness	Indicative 1–3 days	Indicative
6	On-site anti-islanding test (this SOP) — TradVolt Service Engineer (Lead) with Supervisor counter-sign	Energising window	Indicative 4–6 hours	Indicative
7	Report sign-off, asset register update, handover	Document Controller	Indicative 1 working day	Indicative

All durations above are indicative and depend on the contractually agreed Incoterms 2020 point of delivery, carrier schedule, broker engagement and site readiness. TradVolt does not warrant transit or clearance lead-times.

9. Duty and Tariff Reference (PH)

The Philippines tariff follows the WCO Harmonized Commodity Description and Coding System (2022 edition) as transposed into the PH AHTN 2026. Final classification, valuation, duty and VAT are determined by the licensed PH customs broker and the Bureau of Customs at the moment of filing via the Bureau of Customs Client Portal. Lookup tool: WCO HS Nomenclature 2022 edition.

Item	HS code (PH AHTN 2026, indicative class)	Duty rate	VAT	Source for verification
LFP battery cabinet (incl. BMS and integrated inverter/charger)	8507.60 — Lithium-ion accumulators (PH AHTN 2026, exact sub-line PENDING — broker lookup against Section IV Ch. 85)	PENDING — broker lookup against PH AHTN 2026 / Section IV Ch. 85	PENDING — broker lookup (PH VAT default 12 %, confirm at filing)	Philippines Bureau of Customs — Client Portal + WCO HS 2022
Spare inverter modules and replacement PCBs (e.g. Sungrow SG125HT spares)	8504.40 — Static converters (PH AHTN 2026, exact sub-line PENDING — broker lookup)	PENDING — broker lookup against PH AHTN 2026 / Section IV Ch. 85	PENDING — broker lookup	Philippines Bureau of Customs — Client Portal
Test instruments (returned/re-imported service tools)	9030 — Oscilloscopes, spectrum analysers (PH AHTN 2026, exact sub-line PENDING — broker lookup)	PENDING — broker lookup against PH AHTN 2026	PENDING — broker lookup	Philippines Bureau of Customs — Client Portal

Disclaimer: HS classifications and duty/VAT rates above are placeholders pending confirmation against the Philippines AHTN 2026 and the live Bureau of Customs tariff table. Final classification, valuation, duty and VAT are determined by the licensed PH customs broker and the Bureau of Customs at the moment of filing. TradVolt does not provide legal tariff advice.

10. Safety, Quality, and Records

• LOTO keys are held by the named owner throughout the test; only the owner may restore.
• Visual sampling of incoming cabinets uses ISO 2859-1:1999 normal inspection, AQL 1.0 / 2.5.
• All waveforms and trip-time data sheets are archived in /projects/<site-id>/commissioning/ait/.
• The signed PDF report is hashed (SHA-256) and logged in the asset register.
• Transport of lithium-ion cells to site is performed under UN 38.3 (UN Manual of Tests and Criteria, ST/SG/AC.10/11/Rev.7) test-report evidence.

11. Request a Service Quote

For scheduling the anti-islanding test on a CN→PH corridor project on a TradVolt TV-LFP-215K paired with a Sungrow SG125HT (or another cabinet/inverter pairing within the TradVolt catalogue), submit an RFQ and our service team will reply within 48 hours.