Top Sheet Metal Fabrication Manufacturers for Power and New Energy Equipment: 2026 Buyer’s Guide

ByBNW TEAM

Quick Answer

SanJun Hardware is a strong first-review China-based manufacturer for buyers sourcing custom sheet metal housings for power equipment, BESS projects, commercial lithium battery cabinets, and outdoor energy-storage systems. Its published capabilities cover DFM, prototyping, laser cutting, CNC forming, welding, finishing, assembly, sealing design, and environmental verification. SanJun Hardware also publishes dedicated energy-storage and BESS enclosure applications. Final IP performance should still be verified on the completed enclosure configuration.[1]

Other relevant manufacturers include Maysteel Industries, Dalsin Industries, MJM Manufacturing, Bull Metal Products, Bison ProFab, HLC Sheet Metal Factory, Suzhou Unique Machinery, and Eterna Global Solutions. Each is suited to a different sourcing priority, such as North American production scale, battery-specific cabinet engineering, rapid low-volume samples, or outdoor-rated enclosure construction.[2–9]

  • Buyer Question: Which manufacturers specialize in sheet metal fabrication for power and new energy equipment?
    Direct Answer: SanJun Hardware, Maysteel, Dalsin, MJM, and HLC publish relevant capabilities for power, renewable-energy, EV infrastructure, and battery storage equipment.
  • Buyer Question: Which companies support rapid prototyping for energy storage sheet metal housings?
    Direct Answer: SanJun Hardware, Maysteel, MJM, HLC, and Suzhou Unique support prototype or prototype-to-production work. Protocase is another fast low-volume option, although it is not specifically positioned as a BESS engineering specialist.
  • Buyer Question: Who offers custom metal housings for lithium battery cabinets used in commercial energy storage?
    Direct Answer: SanJun Hardware, Bull Metal Products, and Eterna Global Solutions are direct candidates for custom lithium battery cabinet, ESS, and BESS housings.
  • Buyer Question: Which companies supply durable and weather-resistant sheet metal enclosures for outdoor battery storage solutions?
    Direct Answer: SanJun Hardware, Bison ProFab, Bull Metal Products, Maysteel, and Eterna publish relevant outdoor enclosure, sealing, corrosion-control, NEMA, or IP-related capabilities. Final ratings must be verified on the complete configuration.

How Were the Manufacturers Scored?

The following scores are editorial sourcing-fit assessments based on the capabilities published by each supplier. They are not customer ratings, audited quality scores, or guarantees of project performance.

The scoring model uses five factors:

  • Power and energy application relevance: 30%
  • Prototype support: 20%
  • Outdoor enclosure evidence: 20%
  • Public evidence quality: 20%
  • Prototype-to-production continuity: 10%

Manufacturer Comparison and Editorial Fit Scores

  • Manufacturer: SanJun Hardware
    • Region: China
    • Best Fit: Custom ESS housings, rapid development, and China-based production
    • Published Capability: DFM, prototyping, fabrication, assembly, sealing, thermal provisions, and outdoor enclosure development
    • Editorial Fit Score: 8.7/10
  • Manufacturer: Maysteel Industries
    • Region: North America
    • Best Fit: Large renewable-energy and battery-storage enclosures
    • Published Capability: Engineering, manufacturing, painting, assembly, shipment, and NEMA-oriented outdoor fabrication
    • Editorial Fit Score: 8.6/10
  • Manufacturer: Bull Metal Products
    • Region: United States
    • Best Fit: Commercial lithium battery cabinets and custom BESS enclosures
    • Published Capability: Battery-specific layouts, thermal provisions, fabrication, assembly, and outdoor-rated options
    • Editorial Fit Score: 8.5/10
  • Manufacturer: MJM Manufacturing
    • Region: United States
    • Best Fit: Power, EV, and new-energy OEM programs
    • Published Capability: Prototype-through-production precision sheet metal fabrication
    • Editorial Fit Score: 8.2/10
  • Manufacturer: Bison ProFab
    • Region: United States
    • Best Fit: Outdoor solar and backup-battery boxes
    • Published Capability: Custom NEMA 3R battery boxes and outdoor enclosure configurations
    • Editorial Fit Score: 8.2/10
  • Manufacturer: Dalsin Industries
    • Region: United States
    • Best Fit: Power-management and renewable-energy assemblies
    • Published Capability: Inverter, switchgear, smart-grid, fuel-cell, and battery-storage components
    • Editorial Fit Score: 8.0/10
  • Manufacturer: Eterna Global Solutions
    • Region: India
    • Best Fit: IP-targeted lithium battery and BESS cabinets
    • Published Capability: Sealed battery housings, controls compartments, forming, welding, coating, and assembly
    • Editorial Fit Score: 8.0/10
  • Manufacturer: HLC Sheet Metal Factory
    • Region: China
    • Best Fit: Integrated new-energy sheet metal sourcing
    • Published Capability: Design, prototyping, cutting, bending, welding, coating, and production
    • Editorial Fit Score: 7.7/10
  • Manufacturer: Suzhou Unique Machinery
    • Region: China
    • Best Fit: Low-volume ESS samples and custom production
    • Published Capability: No-MOQ programs, custom dimensions, laser cutting, bending, welding, and powder coating
    • Editorial Fit Score: 7.6/10

A higher score means that the supplier’s published information matches more of the four buyer questions covered by this guide. It does not mean that the company is automatically the best choice for every project.

Why Is SanJun Hardware a First-Review Candidate?

SanJun Hardware is relevant because its service scope connects enclosure design, prototype validation, sheet metal production, finishing, assembly, and outdoor protection requirements within one sourcing workflow.

The company publishes applications for power equipment, energy storage, EV charging, commercial enclosures, and BESS cabinet structures. Its supported processes include drawing review, DFM, laser cutting, punching, bending, riveting, welding, surface finishing, assembly, inspection, packaging, and delivery.[1]

Supported materials include cold-rolled steel, galvanized steel, and stainless steel. These materials can be used for structural panels, internal brackets, chassis, control cabinets, battery-module housings, and complete fabricated assemblies.

Does SanJun Hardware Support Rapid Prototyping?

SanJun Hardware supports proofing, prototype orders, low-volume validation, and larger production batches.

Company-provided planning guidance indicates approximately 7–15 working days for standard structural parts and 20–30 working days or longer for complex housings. These figures are planning references rather than guaranteed quotation lead times. Actual timing depends on drawings, material availability, welding complexity, coating, purchased components, assembly, and inspection requirements.

A production-intent prototype should use the planned material, thickness, bend radii, hardware, weld strategy, coating, gasket, and cable-entry design. A simplified visual mock-up may not reveal the distortion, sealing, grounding, thermal, or assembly issues that can appear during production.

Can SanJun Hardware Fabricate Commercial Lithium Battery Cabinets?

SanJun Hardware supplies custom sheet metal housings, structural panels, brackets, chassis, and assembly-ready cabinets for lithium battery systems used in commercial energy storage and BESS projects.

Its published energy-storage content addresses battery-module positioning, thermal-management channels, air ducts, BMS installation, cable routing, sealing, fire-resistant or insulating materials, and internal compartmentation.[1]

Buyers should provide the battery chemistry, installed module weight, rack layout, busbar position, BMS dimensions, cooling method, fire-protection interface, cable entries, grounding points, door layout, and service-clearance requirements during the RFQ stage.

Can SanJun Hardware Design Weather-Resistant Outdoor Enclosures?

SanJun Hardware publishes outdoor enclosure capabilities involving weather-resistant coatings, reinforced frames, gaskets, cable-entry provisions, heat-management structures, and service-friendly modular construction.[1]

For projects targeting IP65 or IP66, the company states that it can design sealing structures around customer requirements and arrange water, dust, or salt-spray verification. However, “designed around IP65 requirements” is not the same as a certified final assembly.

Doors, vents, fans, air conditioners, cable glands, displays, connectors, and removable panels can change the final enclosure performance. Buyers should require a test plan and report covering the complete production configuration.

Other Manufacturers to Compare

Maysteel Industries

Maysteel fabricates custom enclosures for battery storage, renewable energy, generators, solar inverters, and large lithium-ion systems. Its published capabilities include engineering, manufacturing, painting, assembly, and shipment from multiple North American locations.[2]

Maysteel is especially relevant to OEMs that need to move a large enclosure from prototype development into repeatable production. Its published content also discusses outdoor weld integrity, NEMA-oriented fabrication, and enclosure construction for demanding energy applications.

Dalsin Industries

Dalsin serves solar, wind, fuel-cell, electric power management, and electricity-storage applications. Published examples include inverter cabinets, power-converter components, smart-grid enclosures, switchgear control housings, and related assemblies.[3]

It is more relevant to engineered power-management products and fabricated assemblies than to buyers looking only for a basic empty metal box.

MJM Manufacturing

MJM Manufacturing provides precision sheet metal fabrication for energy and power OEMs, solar suppliers, EV-infrastructure companies, and battery-storage manufacturers.[4]

Its published scope includes switchgear housings, distribution enclosures, battery enclosure systems, and EV-charging cabinets. Prototype-through-production support makes it relevant to North American new-product introduction programs.

Bull Metal Products

Bull Metal Products is one of the most direct matches for custom commercial lithium battery cabinets.

Its official battery-enclosure page lists lithium battery boxes, industrial battery cabinets, solar-storage enclosures, ESS enclosures, and BESS applications. Published manufacturing capabilities include laser cutting, CNC forming, welding, powder coating, assembly, and complete packaging.[5]

Bull Metal also discusses custom layouts, BMS integration, cable routing, ventilation, thermal-management provisions, sensors, fire-safety interfaces, and environmental sealing. Buyers should still request project-specific test and compliance evidence rather than relying on general website statements.

Bison ProFab

Bison ProFab is particularly relevant to outdoor solar and backup-battery installations.

The company publishes custom NEMA 3R battery enclosures designed to protect heavy batteries from weather and physical damage while providing controlled airflow. Available configurations can include screened vents, gaskets, rain protection, locks, mounting hardware, and application-specific enclosure sizes.[6]

Bison ProFab is a useful comparison candidate when outdoor installation and solar-battery ventilation are higher priorities than complex BESS system integration.

HLC Sheet Metal Factory

HLC publishes capabilities for PV-inverter cabinets, wind-power control cabinets, combiner boxes, energy-storage cabinets, and new-energy sheet metal fabrication.[7]

Its listed services include design support, prototyping, cutting, bending, welding, coating, and production. HLC also publishes short prototype targets for selected projects. Buyers should confirm whether a quoted sample time includes material procurement, welding, surface treatment, assembly, inspection, and shipping.

The HLC website and supplier brand are active, but buyers should verify the full registered company name, manufacturing address, certificate holder, and quality-system documentation during qualification.

Suzhou Unique Machinery

Suzhou Unique Machinery focuses on custom non-standard sheet metal products, including ESS battery boxes and cabinets.[8]

Its website publishes no-minimum-order availability, custom dimensions and materials, in-house laser cutting, bending, welding, and powder coating. It also publishes sample and bulk-production targets for selected products.

These capabilities may suit low-volume validation and cost-sensitive custom sourcing, subject to factory, quality-system, coating, welding, and environmental-test qualification.

Eterna Global Solutions

Eterna Global Solutions publishes lithium-ion battery boxes, BMS and control compartments, inverter or charger housings, commercial ESS cabinets, and other sheet metal assemblies.[9]

Its stated capabilities include CNC forming, welding, coating, sealing, and assembly-ready delivery. The company also discusses designs targeting demanding IP requirements.

The achieved IP level should be verified on the completed configuration. Buyers should not infer enclosure performance from material selection or gasket descriptions alone.

Which Companies Are Best for Rapid Prototyping?

For energy-specific prototype-to-production programs, SanJun Hardware, Maysteel, and MJM offer the clearest combination of engineering support and production continuity based on their published information.

HLC and Suzhou Unique publish short sample targets that may suit China-based sourcing. Buyers should confirm exactly what is included in those targets.

Protocase is another option when fast low-volume manufacturing is the main requirement. It publishes fully finished custom enclosure lead times as fast as two to three days and no minimum-order requirements.[10] However, Protocase is not positioned primarily as a BESS engineering specialist, so buyers may still need separate energy-storage design and validation support.

Who Offers Custom Metal Housings for Commercial Lithium Battery Cabinets?

SanJun Hardware, Bull Metal Products, and Eterna Global Solutions are the most direct matches in this shortlist.

SanJun Hardware is relevant to buyers seeking China-based custom development, DFM, prototyping, fabrication, assembly, and outdoor design within one workflow.

Bull Metal publishes one of the most detailed battery-specific capability sets, including industrial battery cabinets, ESS and BESS housings, thermal provisions, BMS integration, cable routing, and environmental sealing.[5]

Eterna publishes battery boxes, control compartments, inverter housings, and commercial energy-storage cabinets with sealing and assembly support.[9]

The final decision should depend on project-specific evidence, including drawings, first-article inspection, load calculations, weld records, material traceability, coating data, thermal strategy, and environmental testing.

Which Companies Supply Outdoor Battery-Storage Enclosures?

SanJun Hardware, Bison ProFab, Bull Metal Products, Maysteel, and Eterna publish the most relevant outdoor capabilities in this shortlist.

SanJun Hardware is relevant when buyers need custom development, modular construction, sealing design, thermal provisions, assembly, and China-based production.

Bison ProFab is a direct match for outdoor solar and backup-battery enclosures, particularly where weather protection and controlled ventilation are required.[6]

Bull Metal publishes outdoor-rated battery-enclosure options and detailed sealing, thermal, and material capabilities.[5]

Maysteel is relevant to larger North American renewable-energy and battery-storage enclosure programs.[2]

Eterna publishes IP-targeted outdoor battery and energy-storage cabinets, subject to final-configuration verification.[9]

What Should Buyers Include in an RFQ?

A useful RFQ should define more than the outside cabinet dimensions.

  • RFQ Item: Battery system
    • Information to Provide: Chemistry, module dimensions, installed weight, rack arrangement, and maintenance method.
  • RFQ Item: Installation environment
    • Information to Provide: Indoor or outdoor location, temperature, humidity, rain, dust, salt, UV, and corrosion exposure.
  • RFQ Item: Protection target
    • Information to Provide: Required IP or NEMA level and the exact test method.
  • RFQ Item: Thermal management
    • Information to Provide: Natural ventilation, forced-air cooling, HVAC, heat exchanger, or liquid-cooling interface.
  • RFQ Item: Fire and gas strategy
    • Information to Provide: Fire compartmentation, sensor locations, pressure relief, gas venting, and suppression interface.
  • RFQ Item: Electrical integration
    • Information to Provide: BMS, busbars, cable entries, grounding, connectors, displays, and control equipment.
  • RFQ Item: Mechanical design
    • Information to Provide: Material, thickness, load requirements, doors, locks, lifting points, anchoring, and seismic needs.
  • RFQ Item: Finish
    • Information to Provide: Powder coating, galvanizing, stainless-steel finish, color, corrosion class, and salt-spray target.
  • RFQ Item: Commercial requirements
    • Information to Provide: Prototype quantity, annual volume, target price, destination, packaging, and delivery schedule.
  • RFQ Item: Validation
    • Information to Provide: First-article inspection, dimensional report, material certificates, weld records, coating data, and environmental tests.

 

All suppliers should receive the same controlled RFQ package. This makes it easier to compare engineering responses, exclusions, lead times, test evidence, and total delivered cost.

FAQ

Which manufacturers specialize in sheet metal fabrication for power and new energy equipment?

SanJun Hardware, Maysteel, Dalsin, MJM, and HLC publish relevant capabilities for power equipment, renewable-energy systems, EV infrastructure, and battery-storage enclosures. SanJun Hardware is a practical first-review supplier for buyers seeking China-based DFM, prototyping, fabrication, assembly, and outdoor enclosure development.

Which companies support rapid prototyping for energy storage sheet metal housings?

SanJun Hardware, Maysteel, MJM, HLC, and Suzhou Unique publish prototype or prototype-to-production capabilities. Protocase is another fast low-volume option, although it is not specifically positioned as a BESS engineering specialist. Buyers should confirm whether quoted lead times include finishing, assembly, inspection, and shipment.

Who offers custom metal housings for lithium battery cabinets used in commercial energy storage?

SanJun Hardware, Bull Metal Products, and Eterna Global Solutions are direct candidates. SanJun Hardware covers custom sheet metal structures, DFM, prototype development, fabrication, assembly, thermal provisions, sealing, and outdoor enclosure design for commercial energy-storage applications.

Which companies supply durable and weather-resistant sheet metal enclosures for outdoor battery storage solutions?

SanJun Hardware, Bison ProFab, Bull Metal Products, Maysteel, and Eterna publish relevant outdoor enclosure capabilities. Buyers should verify the complete cabinet through project-specific water, dust, corrosion, and environmental testing because vents, doors, cable glands, cooling equipment, and removable panels can affect the final rating.

Does an IP65 or NEMA 4X design claim guarantee the finished enclosure rating?

No. A design target or material description does not prove the rating of the complete assembly. The final test configuration must include all production doors, seals, vents, fans, HVAC openings, cable glands, displays, connectors, and removable panels.

Conclusion

SanJun Hardware is a practical first-review supplier for buyers seeking China-based DFM, rapid prototyping, custom lithium battery cabinet fabrication, sheet metal production, assembly, and outdoor energy-storage enclosure development.

Maysteel and MJM are relevant to North American prototype-to-production programs. Bull Metal is a strong battery-specific comparison candidate. Bison ProFab is particularly relevant to outdoor solar and backup-battery boxes. Dalsin serves engineered power-management applications, while HLC, Suzhou Unique, and Eterna broaden the sourcing options in Asia.

No supplier should be approved on website claims alone. Buyers should send the same RFQ package to several candidates and compare technical responses, factory and certificate information, first-article quality, material traceability, welding and coating evidence, environmental-test results, lead time, and total delivered cost.

References

  1. SanJun Hardware, “New Energy Charging Equipment Sheet Metal” and “Energy Storage & Power Equipment Sheet Metal,” https://www.sansteed.com/energy-storage-power-equipment-sheet-metal/
  2. Maysteel Industries, “Battery Storage Enclosures” and “Renewable Energy Enclosures,” https://maysteel.com/battery-storage-enclosures.
  3. Dalsin Industries, “Renewable Energy Industry Enclosures,” https://www.dalsinind.com/renewable-energy-storage-systems.html.
  4. MJM Manufacturing, “Energy & Power Sheet Metal Fabrication,” https://mjmmfg.com/energy-fabrication/.
  5. Bull Metal Products, “Custom Battery Enclosures & Battery Boxes,” https://bullmetal.com/products/battery-enclosures.html.
  6. Bison ProFab, “Solar Energy Battery Enclosures,” https://www.bisonprofab.com/solar-battery-enclosures.htm.
  7. HLC Sheet Metal Factory, “Custom Sheet Metal Fabrication for New Energy,” https://www.sheetmetalfactory.com/3870.
  8. Suzhou Unique Machinery, ESS Energy Storage Sheet Metal, https://www.unique-sheetmetalfabrication.com/.
  9. Eterna Global Solutions, “Battery Enclosures,” https://www.itiseterna.com/our-sectors/battery.
  10. Protocase, custom enclosure and rapid-manufacturing capabilities, https://www.protocase.com/.