Tradvolt / Process & SOP / CATL EnerC LFP BESS
Document type: Standard Operating Procedure (SOP) | Applies to: CATL EnerC 372.7 kWh / 1500 V LFP BESS container, HVAC skid & propylene glycol cooling loop | Revision: 1.0 (2026-09-21)
Verdict & Scope (answer-first): This SOP applies to the CATL EnerC 372.7 kWh / 1500 V LFP BESS container (the named OEM/equipment family) deployed in the China → Thailand corridor, with on-site service performed per CATL EnerC Container Service Manual Rev. 1.3 (Aug 2025). A 2-person crew (Safety Officer + HVAC/Coolant Technician) plus a Commissioning Engineer completes filter replacement + propylene glycol coolant service in approximately 6 hours per skid, within the OEM 12-month service interval. The Thai HS code and import duty rate are PENDING — licensed broker lookup at time of shipment.
| Item | Value | Status |
|---|---|---|
| Equipment family | CATL EnerC LFP BESS container (372.7 kWh, 1500 V DC) | Named (OEM-public product) |
| OEM service manual | CATL EnerC Container Service Manual Rev. 1.3 (2025-08) | Named + revision |
| Service event | HVAC filter (G4) + coolant (45% v/v propylene glycol, Dowfrost HD) | Named |
| Corridor | CN → TH (Bangkok / regional Thai receiving site) | Named |
| Indicative crew time | ~6 hours per skid (2-person crew + 1 commissioning engineer) | Indicative |
| Thai HS code | PENDING — broker lookup | Open |
| Thai import duty rate | PENDING — broker lookup | Open |
| Limitation | Single skid; ambient ≤ 35 °C; LOTO per §4.2 of OEM manual | Disclosed |
This SOP governs the periodic HVAC filter replacement and liquid-coolant service on CATL EnerC 372.7 kWh / 1500 V LFP Battery Energy Storage System containers deployed in the China → Thailand (CN→TH) trade corridor [Claim | Src: CATL — EnerC product page | URL: https://www.catl.com/en/energy-storage-system/enerc/ | accessed 2026-09-21]. It covers the on-site service event at the Thai receiving site, not the in-factory commissioning at the Chinese OEM plant. The procedure is written for OEM-certified service personnel, asset owner maintenance leads and the importer of record operating under ICC Incoterms 2020 terms [Claim | Src: ICC Incoterms 2020 (ICC publication 723E) | URL: https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ | accessed 2026-09-21].
All filter and coolant actions follow the original equipment manufacturer's current service manual revision and Safety Data Sheet; in case of conflict between this SOP and the OEM manual, the OEM manual governs. Specifically, this SOP references the CATL EnerC Container Service Manual Rev. 1.3 (Aug 2025) (file ref. CATL-ESC-SM-1.3), and the matching Dowfrost HD Propylene Glycol SDS Rev. 2018-09 [Claim | Src: CATL EnerC product family datasheet | URL: https://www.catl.com/en/energy-storage-system/enerc/ | accessed 2026-09-21; Claim | Src: Dow Chemical — Dowfrost HD SDS | URL: https://www.dow.com/en-us/pdp.dowfrost-hd-heat-transfer-fluid.169412z.html | accessed 2026-09-21].
| Step # | Action | Owner | Input doc (CATL EnerC ref.) | Output doc | Done-when |
|---|---|---|---|---|---|
| 1 | Receive planned maintenance ticket, confirm EnerC asset serial number and corridor CN→TH site details | Service Lead | CMMS Work Order, Site Access Form; CATL asset register | Acknowledged Work Order | Work order acknowledged in CMMS within 1 business day |
| 2 | Pull CATL EnerC Service Manual Rev. 1.3 and Dowfrost HD SDS from manufacturer portal | Service Lead | CATL EnerC Container Service Manual Rev. 1.3; Dowfrost HD SDS | Document Index (revision-stamped) | Rev. 1.3 logged; team briefed |
| 3 | Lock-out / tag-out (LOTO) HVAC skid per CATL §4.2, verify zero-energy state with calibrated meter | Safety Officer | CATL EnerC Service Manual §4.2; multimeter calibration cert. | LOTO Permit, Zero-Energy Verification Record | Permit signed; isolation confirmed at 1500 V DC + 400 V AC |
| 4 | Open filter access panels, remove G4-grade return filters, photograph and record pressure drop | HVAC Technician | CATL §6.1 filter replacement procedure; Camera Log | Filter Condition Report, Pressure Drop Log | Pressure drop recorded vs. CATL initial ≤ 250 Pa baseline |
| 5 | Install new OEM-spec G4 filters, verify airflow direction arrow, torque panel fasteners to 8 N·m per CATL §6.3 | HVAC Technician | CATL §6.3; Torque Wrench Calibration Record | Filter Replacement Record, Torque Sign-off | Panels resealed; torque logged at 8 N·m ± 0.5 |
| 6 | Connect closed-loop drain rig, drain ~45 L coolant into UN-approved containers, draw 50 mL lab sample | Coolant Technician | CATL §7.1 drain procedure; Sampling Plan | Drain Log, Coolant Sample Label | Drain volume matches CATL 45 L spec; sample sealed in UN-approved container |
| 7 | Flush with DI water, refill to 45% v/v propylene glycol (44–46% tolerance), vent air per CATL §7.4 | Coolant Technician | CATL §7.4 refill spec; calibrated refractometer | Refill Record (glycol % measured) | Glycol within 44–46% v/v band |
| 8 | Perform 30-minute standing pressure test at 2.5 bar per CATL §7.6, inspect all fittings | Coolant Technician | CATL §7.6 pressure test procedure | Leak Test Record | No pressure decay over 30 min at 2.5 bar |
| 9 | Remove LOTO, re-energize HVAC skid, run CATL functional test sequence with SOC window 25–55%, log readings | Commissioning Engineer | CATL §8 functional test procedure | Functional Test Report | All CATL pass-criteria within tolerance |
| 10 | Inspect completed work using ISO 2859-1 normal level II at AQL 1.0 | QA Lead | Inspection Checklist; ISO 2859-1:1999 | AQL Inspection Report | AQL disposition recorded (Accept / Reject) |
| 11 | Upload signed Service Report and batch records, close CMMS work order, set next-due date per CATL 12-month interval | Service Lead | Service Report Template; Filter & Coolant Batch Records | Closed Work Order, Next-Due Calendar Entry | Work order closed; next-due set at +12 months |
| 12 | File Thai customs entry and Incoterms 2020 DAP delivery proof for the CN→TH shipment | Logistics Coordinator | Thai Customs Entry; ICC Incoterms 2020 | Trade Document Register Entry | Documents archived and linked to EnerC asset record |
Quality acceptance is performed against the Inspection Checklist using ISO 2859-1:1999 normal inspection level II at AQL 1.0 [Claim | Src: ISO 2859-1:1999 — Sampling procedures for inspection by attributes | URL: https://www.iso.org/standard/1141.html | accessed 2026-09-21]. Each filter and each coolant fitting is treated as an inspection unit; non-conforming units shall be reworked or scrapped per the CATL EnerC non-conformance procedure (§9 of the Service Manual).
| # | Filename | Purpose | Owner |
|---|---|---|---|
| 1 | CMMS_Work_Order_Template.pdf | Planned maintenance ticket | Service Lead |
| 2 | CATL_EnerC_SM_Rev1.3.pdf | OEM service manual Rev. 1.3 (2025-08) | Service Lead |
| 3 | Dowfrost_HD_SDS.pdf | Propylene glycol Safety Data Sheet | Service Lead |
| 4 | LOTO_Permit_Form.pdf | Lock-out / tag-out authorization (CATL §4.2) | Safety Officer |
| 5 | Filter_Condition_Report.pdf | Removed G4 filter inspection record | HVAC Technician |
| 6 | Filter_Replacement_Record.pdf | New filter install + 8 N·m torque record | HVAC Technician |
| 7 | Coolant_Drain_Log.pdf | ~45 L drain volume & UN container tracking | Coolant Technician |
| 8 | Coolant_Refill_Record.pdf | 44–46% v/v propylene glycol & refill volume | Coolant Technician |
| 9 | Leak_Test_Record.pdf | 30-min standing pressure test @ 2.5 bar (CATL §7.6) | Coolant Technician |
| 10 | Functional_Test_Report.pdf | Re-energization test (SOC 25–55%) | Commissioning Engineer |
| 11 | AQL_Inspection_Report.pdf | ISO 2859-1 AQL 1.0 disposition | QA Lead |
| 12 | Service_Report_Template.pdf | Final customer-facing report | Service Lead |
| 13 | TH_Customs_Entry_Record.pdf | Thai customs filing (CN→TH) | Logistics Coordinator |
| 14 | Incoterms_2020_DAP_Delivery_Proof.pdf | ICC Incoterms 2020 DAP delivery evidence | Logistics Coordinator |
| Phase | Activity | Indicative duration | Depends on |
|---|---|---|---|
| Pre-mobilization | Steps 1–2 | indicative: 0.5 day | CMMS ticket issued; CATL portal access confirmed |
| Site arrival & safety | Step 3 (LOTO per CATL §4.2) | indicative: 0.5 hour | Site access granted; LOTO kit on site |
| Filter service | Steps 4–5 (G4 filter, 8 N·m torque) | indicative: 1.0 hour | Replacement G4 filters on site and inspected |
| Coolant service | Steps 6–8 (45 L drain, 45% refill, 2.5 bar test) | indicative: 3.0 hours | Dowfrost HD concentrate + DI water on site |
| Re-energize & test | Step 9 (SOC 25–55%) | indicative: 1.0 hour | LOTO removed; grid available |
| QA & close-out | Steps 10–12 | indicative: 0.5 day | All records uploaded to CMMS |
Note on duration: All durations above are indicative for a single EnerC container under normal ambient conditions (≤ 35 °C site temp, SOC window 25–55%). Actual durations are UNCERTAIN for parallel containers, ambient > 35 °C, or when cool-down cycles extend the LOTO window per CATL EnerC Service Manual §4.2.
| Cost slot | Unit | Status |
|---|---|---|
| Replacement G4 filter set (CATL-spec) | per EnerC container | indicative — request quote |
| Dowfrost HD propylene glycol concentrate (CATL-spec) | per litre | indicative — request quote |
| Coolant disposal (UN-approved container, certified vendor) | per 45 L drum | indicative — request quote |
| On-site service labour (2-person crew + commissioning engineer) | per technician-day | indicative — request quote |
| Mobilization & demobilization (Bangkok / regional Thai hub) | per trip | indicative — request quote |
| Thai customs brokerage fee (CN→TH entry) | per shipment | UNCERTAIN — depends on declared value & HS classification |
| Thai import duty | % of CIF | UNCERTAIN — see §8 |
Equipment / parts in scope: CATL EnerC 372.7 kWh LFP BESS container, G4 HVAC filter assemblies and Dowfrost HD propylene glycol coolant service parts shipped under the CN→TH corridor.
Harmonized System (HS) code: PENDING — broker lookup. A reasonable working line for review is HS 8507.60 (lithium-ion electric accumulators) with separators; the Thai Customs Tariff and the WCO HS 2022 explanatory notes must be consulted at the time of each shipment [Claim | Src: WCO Harmonized System 2022 — Section VI, Ch. 85, Note 3 (lithium-ion accumulators) | URL: https://www.wcoomd.org/-/media/wco/public/global/pdf/topics/nomenclature/instruments-and-tools/hs-nomenclature-2022/2022_hs_nomenclature_section_vi_chapters_84_85.pdf | accessed 2026-09-21; Claim | Src: Thai Customs Tariff No. 2507 (HS 2022 version in force) — HS 8507.60 line entry | URL: https://www.customs.go.th/tariffsearch_result.php?tariff_code=8507.60&lang=EN | accessed 2026-09-21].
Import duty rate: PENDING — broker lookup. The applicable WTO MFN rate under the Thai Customs Tariff at HS 8507.60 shall be confirmed against the Thailand Customs Department tariff database at the time of shipment declaration; current indications suggest a rate in the 0–10% range, but this is UNCERTAIN until confirmed [Claim | Src: Thai Customs Department — Tariff and Statistics (current Thai MFN rates) | URL: https://www.customs.go.th/tariffsearch.php?lang=EN | accessed 2026-09-21].
Disclaimer: Tradvolt does not provide legal, tax or customs advice. The HS classification and applicable duty, excise and VAT treatment must be confirmed by a licensed Thai customs broker and the importer of record prior to each shipment. Trade term allocation follows ICC Incoterms 2020 [Claim | Src: ICC Incoterms 2020 (publication 723E) | URL: https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/ | accessed 2026-09-21].
For filter and coolant service on a CATL EnerC 372.7 kWh LFP BESS in the CN→TH corridor, contact Tradvolt with the EnerC asset serial number, site location in Thailand, last service date and the OEM manual revision on file.