Enclosure Only
SCS builds the shell and fit-out. Your integrator installs everything electrical.
BESS Containers: Battery Energy Storage System Enclosures
- Format
- 20ft (10ft compact)
- Sealing
- IP55 per IEC 60529
- Climate
- -20 to +55 deg C
- Venting
- Deflagration-rated
Request a BESS Enclosure Quote
20ft ISO footprint (6,058 x 2,438 x 2,591 mm, High Cube 2,896 mm), ~5,000 kg fitted pre-battery. Fire-retardant lining, non-slip grated floor with bunded sump option, redundant air- or liquid-cooled HVAC, deflagration ceiling vents and pressure-release valves.
IP55 sealing per IEC 60529, ISO 12944 C4H to C5 coating band, AS/NZS 1170.2 Region D tie-down engineering available. Shell carries ISO 668:2020, ISO 1496 and CSC approval. Battery-fitted units ship under UN 38.3 as UN 3480 Class 9 goods.
Solar and wind farms, mine sites, remote microgrids and industrial facilities, from cabinet-scale C&I systems near 100 kWh to multi-megawatt-hour grid units. Delivered to the Atacama Desert engineered to NFPA 855 fire provisions and the NCh433 seismic envelope.
Overview
The enclosure scope, factory-direct
SCS Global manufactures BESS containers factory-direct: purpose-built enclosures that house battery energy storage systems for utilities, renewables developers, EPCs and mine operators. We build the welded shell and the thermal, fire and access fit-out, then ship worldwide as part of our electrical infrastructure solutions range. The battery racks, inverters and controls stay in your integrator's scope, with the supply split agreed at RFQ and units built to project schedule.
Specifications
BESS Enclosure Design & Specifications
BESS enclosures are built on a 20ft ISO footprint, sealed to IP55, with fire-retardant lining, deflagration venting and redundant HVAC engineered around the battery system's thermal behaviour. A 10ft compact variant suits smaller systems, and shells carry ISO 668:2020 dimensions with ISO 1161 corner castings for crane and forklift handling. Good BESS container design works backwards from the battery: heat out, dust excluded, off-gas vented, people through a PA door, equipment through wide side or end openings. Specifications conform to industry standards. Confirm to project requirements.
| Specification | Value |
|---|---|
| Base format | 20ft ISO footprint, 10ft compact variant |
| External dimensions (20ft) | 6,058 x 2,438 x 2,591 mm (2,896 mm High Cube) |
| Internal dimensions (typical fitted 20ft) | 5,350 x 2,180 x 2,480 mm |
| Tare weight (fitted, pre-battery) | ~5,000 kg |
| Lining | Fire-retardant internal panelling |
| Flooring | Non-slip grated floor, bunded sump option (~3,025 L) |
| Ingress protection | IP55 per IEC 60529 |
| Corrosion protection | ISO 12944 C4H to C5 coating band |
| Climate control | Redundant HVAC (100% redundancy), air- or liquid-cooled, negative-air dust exclusion |
| Operating envelope | -20 deg C to +55 deg C, cold-climate builds to -30 deg C |
| Deflagration control | Ceiling vents and pressure-release valves |
| Wind engineering | AS/NZS 1170.2 Region D tie-down engineering |
| Access | Wide side and end doors, PA door, forklift pockets |
| Shell standards | ISO 668:2020, ISO 1496, CSC (units shipped as containers) |
The System
Battery Storage Container Solutions
The enclosure houses the racks and BMS (LFP cells dominate current builds), PCS or inverter, EMS, thermal management and fire detection. Current-generation utility units carry around 3.7 to 6.0 MWh per 20ft unit. Specifiers name the format several ways: battery storage shipping container, battery energy storage system container, container BESS. It's also known as an ESS container or energy storage system enclosure. Battery-fitted units ship under UN 38.3 lithium transport rules as UN 3480 Class 9 goods. Enclosure-only units travel as standard CSC containers.
Fire Safety
Fire Safety & Thermal Management
Fire safety in a battery storage enclosure combines fire-retardant lining, deflagration venting, suppression readiness and thermal management that holds cells in their operating window. Thermal runaway drives the design. Ceiling vents and pressure-release valves manage off-gas events along NFPA 69 principles, and the fit-out arrives suppression-ready: gas plus water at utility scale, monitored or non-monitored in Australian practice. UL 9540A, the fire-test method behind those decisions, evaluates thermal runaway propagation at cell, module, unit and installation level.
Why SCS
Why Choose SCS for BESS Enclosures?
SCS Global builds BESS enclosures factory-direct: welded steel ISO-base shells with the thermal and fire fit-out installed and tested at the factory before shipping. Every unit leaves our Yixing, Jiangsu line with its corner castings and ISO 668 dimensions intact, so a finished enclosure moves through ports as standard containerised freight. Our sweet spot is the 20 to 50 unit order: large enough to need real project engineering, small enough that you deal directly with the people doing the work, an engineering partner holding the design conversation from single-line diagram to dispatch.
Compliance
System Compliance & the Enclosure's Contribution
Compliance attaches to the installed system, never the enclosure alone: our build contributes the lining, venting, suppression readiness and IP and coating ratings. UL 9540A fire-test evidence and NFPA 855 siting provisions attach to the installed system your integrator commissions. In Australia, lithium batteries are Class 9 dangerous goods under UN 3480, so AS/NZS 4681 and AS 1940:2017 bunding logic can apply to containerised lithium battery storage.
ISO 
Bureau Veritas 
DNV 
Lloyd's Register 
BIC 
ABS Standards & References
Standards behind the build
The enclosure is engineered against the standards below: enclosure-scope ratings on the shell, system-scope frameworks named for the layer they govern. Click through to the source authority for the full text and current revision.
IEC 60529 Ingress protection: the IP55 rating on the sealed enclosure. International Electrotechnical Commission
UL 9540A Thermal runaway fire propagation test method, evaluated at cell, module, unit and installation level. UL Solutions
NFPA 855 Standard for the installation of stationary energy storage systems: siting and separation at the installed-system layer. National Fire Protection Association
AS/NZS 4681 Storage and handling of Class 9 dangerous goods, applicable to containerised lithium battery storage in Australia. Standards Australia
AS/NZS 1170.2 Wind actions: Region D tie-down engineering for cyclonic Australian sites. Standards Australia
ISO 668 Series 1 freight container dimensions: the shell moves through ports as standard containerised freight. International Organization for Standardization
Integration Levels
Battery Storage Container Supply Levels
Containerised battery storage is supplied at three integration levels: the enclosure alone, semi-integrated with racks and auxiliaries pre-installed, or fully integrated and grid-ready. The level decides who supplies what. Which levels apply to your project is scoped at RFQ.
Semi-Integrated
Racking, HVAC, suppression and cable containment arrive pre-installed for the integrator to populate and commission.
Fully Integrated
A grid-ready containerised battery energy storage system, delivered as one package.
Applications
Battery Energy Storage Container Applications
Battery energy storage containers deploy on solar and wind farms, mine sites, remote microgrids and industrial facilities, from cabinet-scale C&I systems near 100 kWh to multi-megawatt-hour grid units.
Solar & Wind Farms
Our Atacama BESS enclosures were engineered to NFPA 855 and the NCh433 seismic envelope and delivered to the grid-connect date, the same shells serving as solar inverter enclosures.
Mining & Microgrids
Mine sites and remote microgrids pair battery storage with genset and solar generation, housed in enclosures built for dust, heat and cyclone regions.
Utility Yards & Grid
Utility yards run banks of industrial battery containers craned onto prepared footings. A BESS installation usually needs a connection switchroom, so units pair with our containerised substations.
Industrial & C&I
Industrial facilities deploy cabinet-scale commercial and industrial systems near 100 kWh through to multi-megawatt-hour units, cyclonic sites adding Region D tie-down engineering.
Send your unit count, integration level and destination for a factory-direct specification and price.
Request a BESS Enclosure Quote
Engineering Resources
Download technical documentation
Specification documents for engineering review. Every engineering document published here has a crawlable HTML equivalent elsewhere on the page.
Related Products
Explore the electrical infrastructure range
Sister products in the SCS switchroom and electrical infrastructure range, built on the same Yixing line against the same compliance baseline.
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Switchroom & Electrical Compliance Guide
Which standard governs what, mapped to the layer of the build each one covers.
bess compliance and fire safetyFAQ
Frequently Asked Questions
Four questions procurement, engineering and operations teams ask most often about BESS containers.
What is a battery energy storage system?
A battery energy storage system, or BESS, stores electrical energy in battery racks and releases it on demand. A complete system adds a power conversion system, a battery management system and an energy management system, usually housed in a purpose-built container.
How do battery energy storage systems work?
The system charges from the grid or renewable generation, storing DC energy in the battery racks. The power conversion system converts between DC and AC both ways, the BMS supervises cell voltage and temperature, and the EMS decides when to charge and dispatch.
Are battery energy storage systems safe?
Modern systems are engineered around thermal runaway risk: UL 9540A fire testing, gas detection, deflagration venting and suppression, plus separation distances from installation standards. The enclosure contributes lining, venting and suppression readiness. Our compliance guide covers the standards layer by layer.
What is a BESS enclosure?
A BESS enclosure is the engineered building that houses a battery energy storage system: a sealed, climate-controlled container with fire-retardant lining, deflagration venting and suppression-ready fit-out. Built separately from its batteries, it ships as standard container freight.