Steel enclosures for grid-scale and C&I battery energy storage systems.
A BESS enclosure has to hold its coating, its seals and its fire strategy for years in the environment it stands in — coastal, industrial or high-ambient — while giving the integrator predictable access for racks, cabling and thermal management.
At a glance
- SegmentBattery energy storage systems
- Typical buyersEPC / IPP project engineers, system integrators
- Core disciplineFire isolation, thermal management, corrosion resistance
- CoatingISO 12944 C5M as standard
What we supply
Scope of supply
What Powervault supplies
- ISO-format steel shell, corrosion-rated envelope
- Structural frame and roof, corrugated for stiffness
- Fire barrier partitioning and suppression-system provisions
- HVAC and thermal management provisions
- Cable entries, gland plates and cable management
- Internal fit-out — racking supports, cable trays, lighting
- C5M marine-grade coating system
- Weld inspection, coating (DFT) checks and water-ingress testing
Customer-supplied
- Battery racks and modules
- Battery management system (BMS)
- Power conversion system (PCS) / inverter
- Energy management system (EMS)
- Fire detection and suppression system, and agent selection (Powervault provides partitioning and mounting provisions)
- Site foundation and earthing
Configuration options
Sizes and finishes, not fixed part numbers
| Parameter | Range offered |
|---|---|
| Footprint | 20 ft / 40 ft ISO-format, or custom footprint on request |
| Door & access | Single or double-leaf personnel doors; separate equipment access as required |
| Coating grade | C3 / C4 / C5M (marine, high-corrosivity) |
| Insulation | Thermally rated panel options for high-ambient or cold-climate sites |
| Fit-out level | Shell only · structural + electrical · fully outfitted |
Standards for this segment
Engineered to. Not implied.
| Standard | Scope | Status |
|---|---|---|
| IEC 62933 | Electrical energy storage systems | Design reference — enclosure requirements of the standard addressed; system compliance sits with the integrator |
| IEC 62619 | Safety of secondary lithium cells and batteries | Customer scope — cell and battery-system certification sits with the integrator; enclosure provisions coordinated to it |
| UL 9540 / NFPA 855 | ESS safety and installation context | Design reference — enclosure provisions designed with reference to; system listing sits with the integrator |
| ISO 12944 C5M | High-corrosivity marine coating system | Engineered to |
| EN 1090 / ISO 3834 | Structural steelwork and welding quality | Engineered to |
| ISO 668 / ISO 1496 | Dimensions, ratings and structural testing (ISO Series 1 format) | Engineered to — ISO 1496-1 type approval in progress |
Certification scope is confirmed per customer requirement at order stage.
Engineering notes
What we've actually thought about here
- Fire barrier partitioning is designed around your chosen suppression system and cell chemistry, not retrofitted after the shell is built.
- Cable entry and gland layout is agreed against your PCS and switchgear drawings before fabrication starts, not standardised across projects.
- Every enclosure leaves the paint line with the coating grade specified — C5M as standard — regardless of order size. A coastal site does not get a lighter spec because the order was small.
Get a technical response
Send us your BESS enclosure specification.
Application, sizing, coating grade and governing standard — the more you give us, the faster we can price it.