Outdoor BESS Enclosures: A Battery Storage Fabrication Case Study From XCWY

Outdoor BESS Enclosures: A Battery Storage Fabrication Case Study From XCWY

Battery energy storage systems live and die on the enclosure. The cells are standard; the housing is not. It has to keep moisture out for a decade, hold heavy racking under wind load, pass ventilation and fire-safety review, and still ship at a cost the integrator can defend to its investor. This case study walks through how we fabricated a family of outdoor battery energy storage enclosures at our Nanpi plant — the process route, the sealing details and the numbers that mattered.

In short: an energy storage integrator (anonymised for confidentiality) ordered outdoor BESS enclosures in three sizes, built from galvanised steel with gasket-channel formed doors, weather-rated powder coating and full CMM inspection. First article passed on the first review; production ran to schedule with EN 10204 certificates shipped with every batch.

The Project

The scope was a modular range of outdoor enclosures for battery racks and power conversion equipment: roughly 1,400 × 1,000 × 2,200 mm, 1,000 × 800 × 2,000 mm and 800 × 600 × 1,800 mm, all fabricated from 1.5 mm and 2.0 mm galvanised steel. The non-trivial part was not the bending — it was everything around it:

• Gasket-channel formed door frames with continuous foam seals for IP54-class outdoor service
• Ventilation louvers and cable glands on the walls, positioned to clear internal racking
• Threaded PEM studs and weld-nuts for the internal mounting rails
• A two-coat outdoor powder system with a galvanised base for salt and humidity resistance
• Flatness and door-frame squareness held tight enough that doors close first time, every time

The integrator had previously bought enclosures from two different suppliers — one cut and formed, one finished — and reconciled the gaps itself. With XCWY the whole housing came from one floor.

How We Built It

Stage 1 — Laser Cutting

Panels were cut on our 12,000 W fibre laser with ±0.05 mm profile accuracy. Louvers and gland holes were cut in the flat, which is faster and more repeatable than post-cutting. The first article of each size was dimension-checked before the programme was locked.

Stage 2 — CNC Bending

Bodies and doors were folded on a JFY TPR8-100 press brake — 100 tonnes, 3,200 mm bed, ±0.5° on angle. Door frames were formed with the gasket channel in the same operation, so the seal path is consistent along all four sides.

Stage 3 — Welding and Hardware

Frame sub-assemblies were MIG welded, with laser welding used on the longer seams where distortion would fight the door fit. PEM studs and weld-nuts were installed with the right tooling so internal mounting rails sit flat. All welds on weather-exposed corners were ground and inspected for pinholes.

Stage 4 — Surface Finishing

Enclosures were pre-treated, primed and powder coated with a weather-rated two-coat system over the galvanised substrate. Coating thickness was verified per batch, and the integrator received the readings with each shipment. Where the spec called for it, stainless steel variants (304 and 316L) were offered for coastal installations.

Stage 5 — Inspection and Packing

Every door frame was checked on a coordinate measuring machine for squareness and hole position — a bad door frame is the fastest way to ruin a production run downstream. Units were then wrapped, edge-protected and packed for container loading.

Quality Control

• ISO 9001:2015 quality records, registration 34025Q30296R0S, verifiable at the CNCA registry
• CMM reports for door-frame squareness and mounting-hole positions
• EN 10204 material certificates for galvanised and stainless supply
• Coating thickness readings per batch, with salt-spray notes where requested

The Result

• Three enclosure sizes in one programme, sharing the same tooling and finish line
• First-article approval on first review for all three sizes
• MOQ from 1 pc — the integrator validated the design with a single unit before committing to series
• Response time: engineering review and quotation within 3 business hours of receiving the drawings
• Lead time: first articles in 4 weeks, series production scheduled to the customer’s project milestones

The integrator has since folded its second and third housing suppliers into the XCWY programme.

What This Means for Your BESS Enclosure Project

Outdoor storage enclosures look simple until they have to survive weather, racking and audit. What XCWY brings is a single accountable floor: laser cutting, press-brake forming, welding, hardware, finishing and CMM inspection under one roof, one quality system and one engineer. See our metal enclosures capability page, or the process details for laser cutting, CNC bending, welding assembly and surface finishing. For a full build story from drawing to shipment, read our custom metal enclosures case study.

Send your BESS enclosure drawing to xcwystamping@xcwybj.com or via the quote form — an engineer reviews it and returns pricing plus DFM feedback within 3 business hours. MOQ from 1 pc, NDA signed on request.

FAQ

What material do you use for outdoor BESS enclosures?

Galvanised steel as standard, with stainless steel 304 or 316L options for coastal and high-humidity installations. Sheet gauges run from 0.3 mm to 6.0 mm, and material certificates (EN 10204) are available.

Can you hold IP54 / IP55 sealing on a welded enclosure?

Yes. Gasket-channel formed door frames with continuous foam seals are part of our standard fabrication route, and door fit is CMM-checked on every unit before finishing.

What is the largest enclosure you can build?

With a 3,200 mm press-brake bed and 12,000 W laser, we fabricate enclosures up to roughly 3,000 mm in the bending direction. Tell us your size on the drawing and we will confirm the route.

Do you build enclosures in multiple sizes for one programme?

Yes — this case study covered three sizes sharing one tooling and finish line, which keeps per-unit cost down for the whole family.

What is your minimum order and lead time?

MOQ from 1 pc for validation; first articles typically 4 weeks from drawing approval, with series production scheduled to your milestones. Quotations are returned within 3 business hours of receiving the drawing.