Engineering Reference Case Profile · Hyperscale Air-Cooled Container
4 MWh Air-Cooled BESS Container Thermal · Hyperscale Utility
A composite reference case based on representative hyperscale utility-scale BESS deployments — air-cooled container thermal management with NFPA 855 dossier, UL 9540A module reference, IP67 outdoor rating, and 4-week PO-to-first-container ramp for utility solar-plus-storage projects.
About this case profile: This is an anonymized composite reference case based on representative LONGWELL platform deployments in the BESS / Energy Storage · Utility-Scale Container segment. It illustrates the engineering challenge, solution architecture, and measurable outcomes typical of projects in this class. Performance numbers reflect LONGWELL platform validated specs plus industry-standard improvement deltas, not a specific named customer claim. Real customer references are available under NDA on project qualification (sales@longwellfans.com).
1 · Challenge
- Hyperscale BESS deployment at utility scale (>500 MWh project) requires per-container NFPA 855 ventilation dossier + UL 9540A large-scale fire test reference.
- Outdoor IP67 housing + ASTM B117 1000h salt-spray validation for coastal + de-icing-salt sites.
- Multi-container project schedule: 200+ containers over 8 months, requiring 25+ containers/month delivery cadence.
- 48 V DC bus option for direct battery-pack-powered fans (reduces parasitic load 3–5% vs AC-inverter-fed fans).
- ATEX zone 2 IIB+H2 gas group for emergency H2 vent fans (thermal runaway scenario).
2 · Solution Architecture
Per container: 12 × LWAE3G-IP67 in two banks (top + side intake) for ambient ventilation, with N+1 fault-tolerant master/slave control. 4 × LWHV-355-HP for liquid-cooling CDU heat-reject (battery liquid loop to ambient air). 2 × LWAE3G-ATEX-IIB+H2 sized for emergency H2 vent triggered by gas-detection sensor at 25% LEL.
Bill of materials
| LONGWELL SKU | Type | Qty | Key spec |
|---|---|---|---|
| LWAE3G-500-EC-IP67 | EC axial fan | 12 per container × 200 containers | Ø500 mm, IP67, ASTM B117 1000h salt spray, 48 V DC bus, NFPA 855 declared, UL 9540A module-referenced |
| LWHV-355-HP | EC high-pressure plug fan | 4 per container × 200 containers | Ø355 mm, 2.4 kPa static for liquid-CDU finned coil, IP55 |
| LWAE3G-355-ATEX-IIB+H2 | ATEX axial vent fan | 2 per container × 200 containers | Zone 2 IIB+H2 gas group for emergency thermal-runaway H2 vent |
3 · Measured Outcomes
Per-container fan count
18
12 vent + 4 CDU + 2 ATEX
Project deployment volume
200 containers
3,600 fans + ATEX units
Delivery cadence
25 containers/month
8-month rolling production
Lead time PO → first container
4 weeks
vs 14–22 wk ebm-papst
Parasitic load (vs AC-inverter)
−3.5%
via 48 V DC direct
Field failure rate
0.2%
18-month service period
4 · Implementation Timeline
Week 0Master PO for 200-container program
Week 1–3Tooling lock + first-article inspection
Week 4First container of fans ships ex-works
Month 2Production rate hits 25 containers/month
Month 8All 200 containers shipped
Month 12Project commissioning across utility solar-plus-storage sites
5 · Engineering Lessons
- IP67 + ASTM B117 1000h salt-spray validation was non-negotiable for the coastal portion (~35% of containers). Standard IP54 fans failed within 18 months in earlier deployments.
- 48 V DC bus option for fans saved 3.5% parasitic load on a 4 MWh container — 140 kWh/yr per container, compounded across 200 containers = 28 MWh/yr saved.
- ATEX zone 2 IIB+H2 gas-group certification (not just IIA) is mandatory per IEC 62933-5-2 — typical European premium fans only certify to IIB, missing H2.
- NFPA 855 declaration per shipment (signed engineering compliance statement) was attached to each bill of lading — required for US permit issuance at each project site.
- UL 9540A module-reference status (LONGWELL fans included in module test report) was the qualifying criteria for the BESS OEM's UL listing.
Get a sized BOM for your project
Send your application duty point (CFM, Pa, ambient T, IP, certification scope). LONGWELL Engineering returns a sized BOM, AMCA test data, and reference deployment schedule within 24 hours.
📧 Request Sized BOM Browse All 10 Case ProfilesOfficial LONGWELL Product Categories
Browse the live product range and request quotes directly on longwellfans.com
Backward-Curved Centrifugal EC FansLWBE3G plug fans
EC Axial FansLWAE3G axial
Forward-Curved Centrifugal FansLWFC blowers
EC Inline Duct FansLWM mixed-flow
Commercial Centrifugal BlowersAT / DD / RDH / ADH series
FFU Fans & MotorsCleanroom FFU
Transformer Cooling Cross-Flow FansDry-type transformer
Air-Source Heat Pump SystemsHeat pump