Energy Storage
& Backup Power
Cabinet, busbar and enclosure hardware for grid-scale storage and data center standby.
MES extrudes, casts, machines and forges the metal components inside battery energy storage and standby power equipment — in eight countries, with our own engineers on the floor.
5 Pressures on Storage & Standby
Five pressures on storage and standby sourcing that were not there three years ago.
Data center ride-through
Every hyperscale facility needs batteries to bridge to generator start, and increasingly a larger BESS for peak shaving.
Air to liquid
Air-cooled cabinets are giving way to liquid, because temperature uniformity across a module stack sets degradation rate. That moves thermal content from sheet metal to machined and die cast plates.
Domestic content rules
Storage projects frequently carry domestic content requirements tied to tax credit qualification.
Copper cost basis
Since April 2026, Section 232 duty on covered copper is assessed on full customs value. A single cabinet contains 200 to 600 machined and plated interconnect joints.
Twenty-year outdoor life
These enclosures sit in coastal and desert environments for two decades. Alloy and finish have to be specified together.
Four Applications. One Enclosure Capability.
Storage and standby power serve the data center and the grid. The purposes differ. The mechanical content is close to identical — large outdoor-rated enclosures, structural framing, current-carrying busbar and thermal plates.
DATA CENTER RIDE-THROUGH & STANDBY
Batteries bridge seconds to minutes. Generators carry anything longer.
Critical Spec
The spec that matters: joint integrity across 200 to 600 bolted connections in a thermally cycling cabinet.
Materials
6005A-T6 · A380 aluminum · C11000 copper · 316 stainless · CF8M · 310S
Typical Supply Chain
Vertiv · EnerSys · Caterpillar · Cummins · Generac · Rolls-Royce mtu · Kohler · Bloom Energy
GRID-SCALE BATTERY STORAGE
Four-hour and longer duration, cycling daily rather than rarely.
Critical Spec
The spec that matters: 5 mm minimum wall in a compression-loaded end plate, ASTM E505 Level 2 porosity.
Materials
6005A-T6 · 6063-T6 · A380 aluminum · C11000 copper · 316 stainless
Typical Supply Chain
Fluence · Tesla Energy · Powin · Wärtsilä · LG Energy Solution · Samsung SDI · CATL
POWER CONVERSION & INVERTERS
The equipment between the battery and the grid. Several percent of throughput rejected as heat.
Critical Spec
The spec that matters: 0.05 mm flatness and 0.8 µm Ra under the power module.
Materials
6063-T6 · 6061-T6 · C11000 copper · A380 aluminum
Typical Supply Chain
Sungrow · EPC Power · Dynapower · SMA America · Ingeteam · Advanced Energy · TMEIC
STANDBY GENERATION
Diesel, gas and emerging fuel cells. Ancillary and enclosure content, not engines or hot-section parts.
Critical Spec
The spec that matters: high-mix, low-volume against a rigid engine interface — 250 to 5,000 pieces a year, certified.
Materials
6063-T6 · 6005A-T6 · A380 aluminum · CF8M · 310S · Inconel-family
Typical Supply Chain
Caterpillar · Cummins · Generac · Rolls-Royce mtu · Kohler Power · Bloom Energy
The Parts Behind Data Center Power
Batteries bridge the seconds. Generators carry the hours. Every enclosure, busbar and bracket in between is a part somebody had to machine, cast or extrude.
Why Storage & Standby Manufacturers Work With MES
Because a battery cabinet fails in ways that pass a first article. Porosity in a compression-loaded end plate reduces effective wall section without changing anything measurable from outside the part. Fifty microhms of resistance rise per joint is invisible on one connection and significant across four hundred.
We review the drawing before the tool is cut. We measure every lot at source.
Certified & Global
- ISO 9001:2015 since 2009
- IATF 16949
- NMSDC Minority-Certified
- Eight countries
WE REVIEW THE WALL SECTION FIRST
A die cast end plate holds a cell stack at preload for twenty years. We specify 5 mm minimum wall in the loaded region and review gating before the first shot.
WE MEASURE AT SOURCE, EVERY LOT
Cooling plate flatness to 0.10 mm against the module face, verified in the supplier's plant. First article on 100% of features, then 5 pieces per lot.
WE SPECIFY FINISH WITH THE ALLOY
1,000 hours salt spray coastal, 500 inland — including at machined faces and cut ends, which is where corrosion starts.
WE EMPLOY THE ENGINEERS IN THE PLANT
Same country, same floor, the day your parts run. Not a quarterly audit the factory prepared for.
Size, Tolerance and Volume Ranges
What we hold and where the limits are.
01
Cabinet, Container
& Structure
02
Cast, Machined
& Forged
How We Prove It Before It Ships
Every number on the drawing has to be measured by someone, somewhere. We do it in the supplier's plant, on the parts that ship — not on your dock, and not on a first article that was made under conditions the production run will never see.
A die cast end plate holds a cell stack at preload for twenty years. It fails from the inside, and nothing about the failure is measurable from outside the part. Four checks catch it before the container leaves.
A cast wall with internal voids has less effective section than the drawing says. The part measures correct, weighs close to correct, and yields early under sustained load. Level 2 is the acceptance limit we hold in loaded regions — looser elsewhere, because porosity in a non-structural boss costs nothing.
Wall thickness in a die casting drifts as the tool wears and as thermal balance shifts across a shift. We measure it ultrasonically rather than by section-and-inspect, because destructive testing tells you about the part you destroyed.
Porosity is a gating and thermal problem, not an inspection problem. It gets designed in or designed out at the tooling stage. We review gate location, wall transitions and cooling before the tool is cut — which is the only point where fixing it is cheap.
Where a customer needs preload performance proven rather than inferred, we can test to the specified load. Most programs do not need this. The ones that do are usually first-of-kind designs where the wall section is being pushed.
Standard Lead Times
The journey from quote to shipped parts. Fast-path engineering and stock deliveries move in days; hard tooling moves in weeks — and with stock in Columbus, Monterrey and Poland, a qualified part is two to five days from your dock rather than thirty days from a port.
Components We Engineer & Deliver
Four assemblies. Aluminum extrusion, high-pressure die casting, precision CNC machining, investment casting and forging.
The structure, and the parts holding cell modules under compression for twenty years.
200 to 600 bolted joints per cabinet, each one a potential resistance rise. And a thermal system moving from air to liquid.
Inverters and PCS between the battery and the grid. The heat sink base under the power module is the critical interface.
Ancillary and enclosure content around the engine. High-mix, low-volume, against a rigid interface.
What Engineers Ask Us
Five specifications decide whether a storage cabinet performs for twenty years outdoors. All five are set on the drawing.
01WALL SECTION: SPECIFY IT WHERE THE LOAD IS
A die cast end plate holds a cell stack at preload for twenty years.
Porosity in a load-bearing wall reduces effective section without changing anything measurable from outside the part. Specify 5 mm minimum wall in the loaded region, ASTM E505 Level 2 maximum porosity, and ultrasonic thickness verification per lot. Require a gating review before the first shot.
02INTERCONNECT PLATING: A NUMBER, NOT A NOTE
A cabinet contains 200 to 600 joints, each conducting through its plating.
Fifty microhms of resistance rise per joint is insignificant on one connection and material across four hundred. Specify tin at 5 to 15 µm, the governing standard, and that it is measured at the joint face by XRF rather than on the flat.
03COOLING PLATE FLATNESS: AGAINST THE MODULE FACE
Uneven contact means uneven cell temperature means uneven degradation.
A die cast plate dimensionally correct across its outline can still be dished 0.3 mm across the contact area. Cells at the hot end of a stack degrade faster, and the weakest cells set module capacity. Specify 0.10 mm flatness against the module face, separately from the general profile tolerance.
04OUTDOOR FINISH: SPECIFY IT WITH THE ALLOY
Corrosion starts at machined faces and cut ends.
A 6005A extrusion coastal needs a different system than the same part inland — 1,000 hours salt spray per ASTM B117 against 500. Specify the hours, the coating system and the alloy as one requirement, and state what happens at machined faces. Coastal and agricultural sites justify 316 fasteners over 304.
05GENERATOR ANCILLARIES: NAME THE ENGINE INTERFACE
An exhaust flange matches a specific engine, not a general spec.
Alternator end brackets match a frame size and need ±0.05 mm on bearing seats. Neither has enough annual volume — typically 250 to 5,000 pieces — to interest a shop wanting long runs. Specify the mating interface and the certification requirement together, and expect qualification to take longer than the part suggests.
Bolted interconnect connections in a single battery cabinet.
1,000 hours salt spray coastal.
Where We Are Not the Right Answer
The fastest way to be believed about what we can do is to be specific about what we cannot.
- Domestic melt and pour. Storage projects with tax-credit domestic content requirements often need it. If yours does, we will say so and point you toward a domestic source.
- Cells, battery management systems and fire suppression. OEM-supplied — not our lane.
- Engines, alternators and hot-section turbine components. We supply the ancillary and enclosure content around them.
- ITAR-controlled work and DFARS specialty metal restrictions.
- NQA-1 nuclear programs.
- Volumes under 250 pieces a year on a hard-tooled part.
Five Processes. One Partner.
Processes
Aluminum Extrusion
Cabinet and container framing, module trays, coolant headers, canopy framing. To 300 mm circumscribing circle, 6 m lengths, 1.5 mm minimum wall on 6005A, straightened 0.5 mm/m.
High-Pressure Die Casting
Module end plates, cooling plates, DC disconnect enclosures, fan shrouds. 50 to 4,400 tons, 5 g to 40 kg, 5 mm minimum wall in load-bearing regions.
CNC Machining
Interconnect busbar, terminal blocks, cooling plate faces, heat sink bases. ±0.05 mm general, ±0.013 mm critical, 0.10 mm flatness on plate faces.
Investment Casting
Exhaust manifold flanges, turbocharger brackets. 10 g to 50 kg in CF8M, 310S and Inconel-family, service to 850 °C.
Forging
Compression tie rods, lifting lugs, seismic anchors. 50 to 4,400 tons, 4:1 design factor, certified per heat lot.
Materials
6005A-T6 and 6063-T6 aluminum
6005A where framing carries structural and seismic load · 1.5 mm minimum wall · 6063 for panels and trays at 1.2 mm
A380 aluminum
Module end plates, cooling plates, enclosures · 1.5 mm general and 5 mm load-bearing minimum wall · ASTM E505 Level 2 porosity
C11000 copper
Interconnect busbar and terminal blocks · 100% IACS · 3 to 16 mm thick · Tin plated 5 to 15 µm at the joint
316 and CF8M stainless
Fasteners and fittings coastal where 304 is insufficient · CF8M for investment cast wetted components
310S and Inconel-family alloys
Exhaust-side generator components in service to 850 °C
Proof in Production
Real programs, real constraints, and what it took to hold the date.
Let's Build the Storage and Standby Layer
Scaling BESS cabinet production, moving a thermal design from air to liquid, or consolidating generator enclosure content into one supplier — MES delivers the components and the supply chain to get there faster.
BESS Integrator · Inverter and PCS OEM · Generator OEM · Data Center OEM