The right prefabricated data center is sized from four linked inputs: the number of racks and usable rack units, today’s measured IT load, the density of each rack, and the growth you must support without replacing the first module. Then specify the utility service, UPS and battery autonomy, cooling method, redundancy, site conditions, and expansion provisions as one engineered system. A small edge enclosure, a containerized room, a skid-based power block, and a multi-megawatt modular building are not interchangeable products.
Use published capacities as design anchors rather than promises. Dell’s 2026 product material, for example, lists an 8 kW nominal cooling/17RU configuration, integrated 10, 20, and 30 kW power-and-cooling options, and families from 5 to 100 48RU racks with 5 to 115 kW per rack. Vertiv’s 2024 catalog describes expandable 0.5 or 1 MW blocks for IT loads up to 2 MW or more, while Syaala’s 2026 material presents a vendor-stated ladder from a 50 kW edge container to a 10.8 MW campus. These figures belong to different product families and are not a cross-vendor performance ranking.
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Start with the architecture, not a container size
A prefabricated data center is a factory-built, integrated block. Depending on the design, the block can contain only power equipment or combine IT space, UPS and batteries, switchgear, power distribution, HVAC, fire and safety systems, and monitoring. Eaton’s official product material describes standard, adaptable, and fully custom approaches, allowing the factory scope to match the site and the operating model.
Before asking for a footprint or price, decide what must be inside the factory-built boundary. The main choices are:
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- Power or gray-space module: a block for UPS systems, batteries, switchgear, distribution, and related services. IT rooms or racks may remain in a separately built room.
- IT or white-space module: a controlled room containing racks, distribution, cooling, containment, and monitoring, with upstream utility and generation interfaces defined separately.
- Edge all-in-one enclosure: a compact unit that combines IT space, power, cooling, fire protection, security, and monitoring where the site has little staff or building infrastructure.
- Skid-based system: factory-assembled equipment on structural skids. It can be installed in a building or under a separate enclosure, and is useful when the owner wants a repeatable equipment block without moving an entire room.
- Rack-based system: a rack or row package that integrates power, cooling, and controls around a defined rack count and density.
“Containerized,” “modular,” and “micro data center” are often used inconsistently. For procurement, define the words in the performance specification instead of relying on the label. A containerized system normally describes an enclosure that can be transported as a unit; modular describes repeatable blocks that can be added; micro data center generally describes a small, self-contained deployment. A supplier can use more than one label for the same product, so require a drawing, equipment list, operating envelope, and interface schedule.
Calculate the capacity you actually need
Build the requirement from the IT workload outward. A floor area or a shipping-container length does not tell you how much compute the system can support. Your initial worksheet should contain:
- Current rack count and the number of usable rack units (RU) required in each rack.
- Current measured IT power in kW, separated by rack where possible.
- Expected IT growth, including new racks, denser equipment, and replacement cycles.
- Rack inlet and exhaust conditions and the planned cooling medium.
- Single-corded and dual-corded load requirements.
- Required availability or redundancy level.
- Utility voltage, service capacity, fault level, and generator interface.
Use both rack count and power. Two projects with the same number of racks can need radically different cooling and distribution if one has low-density storage and the other has high-density accelerators. Conversely, a high total kW spread across many lightly loaded racks can require more floor space, busway, and cable length than the same load concentrated in fewer racks.
Use rack units and rack density together
Record the usable RU after allowing for power strips, patching, blanking panels, cable bend radius, and service clearances. Do not count an enclosure’s nominal RU as available IT space until the supplier shows the internal layout. Dell’s 2026 examples include a configuration with 17RU of IT allocation and 8 kW of nominal cooling, as well as integrated 10, 20, and 30 kW power-and-cooling options. Those examples are useful reference points for a small deployment, but they do not establish a universal ratio between RU and kW.
For larger systems, Dell lists configurations from 5 to 100 48RU racks and supports published figures of 5 to 115 kW per rack in that product family. Treat the 115 kW figure as a family-specific maximum, not as a target for every rack or a guarantee that the site’s utility, cooling, or IT hardware can operate at that density.
Separate IT load from facility load
Ask every bidder to show the IT load, cooling load, UPS losses, distribution losses, fans, pumps, controls, lighting, and other facility loads separately. A statement such as “1 MW system” is incomplete unless it identifies whether the number is utility input, mechanical capacity, UPS rating, or usable IT load. Require the operating point at normal load and at the stated redundancy condition.
Vertiv’s 2024 catalog describes expandable 0.5 and 1 MW building blocks for IT loads up to 2 MW or more. The wording indicates a modular path, not that every 0.5 or 1 MW block delivers the same usable IT capacity under every cooling and redundancy configuration. The supplier should provide the one-line diagram, losses, cooling derating, and the number of blocks needed for your stated IT load.
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List growth as discrete steps: additional racks, higher-density refreshes, a second tenant, or a new processing cluster. For each step, state the required IT kW, RU, cooling medium, network routes, and target date. This lets the vendor quote an initial module and the exact provisions for later blocks instead of embedding an arbitrary spare percentage.
Syaala’s 2026 product material presents a vendor-stated range from a 50 kW edge container to a 10.8 MW campus. The range demonstrates how broad the prefabricated category is; it is not evidence that a single enclosure scales continuously across that range. Ask where the product family changes, what must be rebuilt between steps, and which utility, civil, and controls components can be reused.
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Choose power architecture and resilience before ordering
State the electrical design as an operating requirement. At minimum, the bid package should identify utility voltage and service arrangement, available fault current, transformer and switchgear responsibilities, UPS topology, battery chemistry and autonomy, generator interface, distribution voltage, grounding, and whether loads are single- or dual-corded.
Redundancy choices
Eaton describes N, N+1, and 2N power and cooling designs. In an N design, the installed capacity meets the calculated requirement with no independent spare component. N+1 adds one additional capacity unit so maintenance or a single failure can be accommodated, subject to the design’s transfer and bypass behavior. 2N provides two independent capacity paths, but the complete benefit depends on dual-corded IT equipment, physically and electrically separate paths, and correctly coordinated controls. Have the supplier show which equipment is redundant, how it is connected, and what remains a single point of failure.
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Specify the required ride-through time and the operating sequence during utility loss. “UPS included” does not state battery autonomy, recharge time, bypass arrangement, maintenance bypass access, or generator compatibility. Require the battery room or cabinet ventilation, temperature limits, fire protection, monitoring points, and replacement method. Confirm whether the generator starts before the battery reaches its minimum state of charge and how staged loads restart.
Distribution and rack connection
Provide the planned distribution voltage, busway or feeder arrangement, breaker coordination requirements, and rack receptacle types. Identify which racks need A/B feeds and which loads can remain single-corded. Ask for spare breaker positions, busway tap-off limits, cable routes, and the maximum future feeder size. These details determine whether a later module can be connected without opening a live operating area.
Match cooling technology to rack density and the site
Cooling must be selected with the rack inlet temperature, exhaust temperature, humidity range, climate, altitude, water availability, and maintenance model. Eaton lists air- and water-cooled options, free-cooling modes, hot- and cold-aisle containment, and fire detection and suppression choices. Require the supplier to state the conditions under which each cooling capacity is achieved and the derating at the site’s design temperature and altitude.
Air cooling
Air-cooled systems can be appropriate for conventional rack densities when the enclosure has adequate airflow paths and containment. Confirm supply and return temperatures, fan redundancy, filter replacement access, outside-air assumptions, and whether free cooling is available in the project climate. A nominal cooling kW without airflow, temperature, and redundancy conditions is not enough to size the room.
Water and liquid cooling
Higher-density racks may require chilled water, rear-door heat exchangers, direct-to-chip liquid cooling, or another liquid approach. Confirm exactly which method the module supports. Ask for supply and return temperatures, flow rate, water quality, leak detection, isolation valves, treatment requirements, and the consequences of a pump or heat-exchanger failure. If the site cannot provide reliable water, price the dry-cooler, heat-rejection, and winterization equipment needed to operate without it.
Containment and fire systems
Hot-aisle or cold-aisle containment changes the air path and service clearances. The drawings should show doors, cable penetrations, smoke detection, suppression discharge, pressure relief, and the effect of containment on maintenance access. Confirm the applicable fire authority requirements and whether the factory or the site contractor is responsible for final testing and acceptance.
Understand containerized, modular, and micro deployments
These terms describe form factors and deployment strategies, not a common technical standard. Compare the actual system against the following questions:
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| Decision area | What to require from the bidder |
|---|---|
| Enclosure | Is the IT room, power plant, cooling plant, or only a portion of the system inside the transportable enclosure? |
| Capacity | State usable IT kW, rack count, RU, rack-density limit, and the conditions for those figures. |
| Repeatability | Identify the smallest additional block, the maximum number of blocks supported, and the controls and distribution interfaces between blocks. |
| Site work | List foundations, slab or pad loads, drainage, grounding, utility work, fire connections, fiber routes, crane access, and transport restrictions. |
| Operations | Show maintenance clearances, spare-part access, monitoring/DCIM integration, remote support, and the live-site tie-in method. |
| Future change | State which components can be expanded, replaced, or relocated and which require a shutdown or civil reconstruction. |
A compact micro deployment may minimize construction but provide little room for battery replacement, service staging, or a second cooling path. A containerized room can simplify factory integration but still needs a properly engineered foundation, utility connection, fire strategy, and lifting plan. A multi-block modular campus can offer finer expansion steps, but its roads, switchyard, cooling plant, controls, and security boundary must be designed as a system.
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Design expansion into the first foundation and utility plan
The safest expansion strategy reserves physical space and utility capacity at the beginning. Eaton describes adding standardized modules in repeatable increments, while Vertiv describes 0.5 and 1 MW building blocks. Ask for a master plan showing the first installation, the ultimate module count, and the boundaries between current work and future work.
Reserve electrical capacity
- Leave documented capacity in the utility service, transformer, switchgear, generator, UPS plant, and distribution busway.
- Show spare breaker ways, feeder conduits, cable trays, and future tie-in points on the one-line and site plans.
- Confirm whether the initial protection, metering, and controls support the final fault level and coordination study.
- Define how a new module is energized, tested, and transferred without interrupting operating loads.
Reserve cooling and mechanical capacity
- Identify spare chiller, dry-cooler, pump, heat-exchanger, and control capacity, including the redundancy condition.
- Reserve headers, valves, pipe routes, drains, water-treatment connections, and space for future heat-rejection equipment.
- Document the maximum rack density that the first cooling plant can support and the point at which a new plant is required.
Design the civil work for the final build-out
Huawei’s Digital Power white paper states: “If the data center requires vertical expansion by adding floors, the future equipment weight and foundation bearing capacity should be considered in the initial design.” The same guidance calls for space for future pipes and cables. Apply that principle even when expansion is horizontal: establish ultimate foundation loads, equipment weights, seismic or wind requirements, drainage, access roads, and the crane route before pouring the first slab.
Ask the vendor to document the maximum number of modules, busway and feeder provisions, cooling-plant headroom, foundation loads, transport dimensions, crane and turning requirements, and the live-site tie-in method. A future module that cannot reach the pad without moving an energized transformer is not a practical expansion option.
Prepare the site and construction package
Factory integration reduces field assembly; it does not eliminate site engineering. Provide bidders with a site information pack containing:
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- Site location, climate design data, altitude, wind, seismic conditions, and flood exposure.
- Utility voltage, service limits, fault level, metering rules, transformer ownership, and generator-fuel constraints.
- Soil report, slab or foundation loading, drainage, grounding, lightning protection, and finished-floor or pad elevations.
- Transport dimensions, road restrictions, turning radius, crane capacity, lift points, laydown area, and security requirements.
- Fiber entry points, diverse communications routes, carrier demarcations, and internal cable paths.
- Fire detection and suppression requirements, hazardous-material rules, noise limits, and local permitting responsibilities.
- Required rack inlet and exhaust conditions, cooling medium, water quality, and maintenance access.
Eaton emphasizes site-specific engineering and factory integration. Make the division of responsibility explicit: who surveys the site, designs the foundation, obtains permits, connects utility and fiber services, performs factory acceptance testing, completes installation testing, and signs the final commissioning record.
Issue a bid specification that produces comparable quotes
Give each bidder the same schedule of requirements and require deviations to be listed line by line. Include:
- Capacity schedule: current and forecast rack count, usable RU, IT kW, density by rack, and the expansion steps.
- Electrical schedule: utility service, voltage, fault level, UPS topology, battery autonomy, generator interface, distribution voltage, grounding, A/B feeds, and redundancy target.
- Mechanical schedule: cooling type, design temperatures, altitude, water conditions, containment, free-cooling expectation, liquid-cooling interfaces, and fire systems.
- Interface drawings: civil loads, pad dimensions, doors, cable and pipe entries, drainage, lifting points, and transport envelope.
- Controls and monitoring: alarms, metering, DCIM or building-management integration, remote access, cybersecurity responsibilities, and data retention.
- Testing and handover: factory acceptance tests, integrated systems tests, protection testing, thermal testing, generator and UPS transfer tests, documentation, operator training, and spare parts.
- Service terms: response time, parts availability, preventive-maintenance scope, battery and filter replacement, software support, and escalation contacts.
Do not request a single lump-sum figure without equipment schedules and exclusions. A quote should identify factory work, transport, craneage, foundations, utility connection, fire systems, communications, commissioning, taxes, and ongoing service separately.
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Use a weighted comparison rather than selecting the smallest enclosure or the largest nameplate. The following categories expose differences that a headline MW figure hides:
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| Category | Questions to answer |
|---|---|
| Usable IT capacity | How many racks, RU, and IT kW are available at the stated inlet conditions and redundancy mode? |
| Rack density | What is the supported kW per rack, and which air or liquid-cooling method achieves it? |
| Footprint and transport | What are the shipping dimensions, weight, lifting points, road restrictions, and required crane or laydown area? |
| Power resilience | Is the design N, N+1, or 2N, and are paths, controls, batteries, and maintenance bypasses genuinely independent? |
| Cooling resilience | What equipment is redundant, what water or air infrastructure is required, and how does capacity derate in the site climate? |
| Expansion granularity | Can capacity be added by rack, row, skid, enclosure, or 0.5/1 MW block, and what must be shut down? |
| Site and civil work | What foundations, roads, drainage, fire connections, utility upgrades, and permits are included? |
| Maintenance access | Can technicians replace batteries, filters, pumps, fans, and switchgear without entering live clearance zones? |
| Monitoring | Are power, cooling, fire, security, and environmental alarms available through the required DCIM or management system? |
| Certification and support | Which certifications apply, who commissions the system, and where are critical spares and service personnel located? |
| Lifecycle cost | What are the energy, water, maintenance, battery, filter, software, training, and eventual decommissioning obligations? |
No authoritative cross-vendor statistic establishes an average installed cost, PUE, or deployment schedule for all prefabricated data centers. Quote those figures only with a named project or vendor, the product configuration, the site conditions, and the date. A factory lead time is not the same as a permitted, energized, commissioned facility.
Follow a controlled buying and commissioning sequence
- Document the workload. Freeze the rack, RU, IT-kW, density, growth, and cooling requirements for the initial bid.
- Define the architecture. Decide whether the project needs a power module, white-space module, edge all-in-one, skid, rack package, or a combination.
- Survey the site. Verify soil, pad loads, utilities, climate, altitude, access, security, fire, fiber, drainage, and crane logistics.
- Set resilience and interfaces. Select N, N+1, or 2N targets; specify UPS autonomy, generator sequence, A/B feeds, cooling redundancy, and monitoring.
- Issue a common performance specification. Require capacity conditions, drawings, exclusions, tests, service terms, and expansion provisions.
- Review the factory design. Approve the one-line, cooling schematic, rack layout, fire strategy, controls points list, civil loads, transport plan, and future-module interfaces.
- Complete factory acceptance testing. Test protection, UPS and bypass operation, controls, alarms, cooling sequences, fire interfaces, and documentation before shipment.
- Prepare the site in parallel. Finish foundations, utilities, fiber, grounding, drainage, fire connections, security, and lifting arrangements to the approved interface drawings.
- Install and commission. Verify physical installation, torque and insulation results, protection settings, network and monitoring points, generator transfers, thermal performance, and integrated failure scenarios.
- Accept with an expansion record. Store as-built drawings, spare-capacity schedules, foundation loads, reserved conduits, busway positions, cooling headroom, and the approved live-site tie-in procedure.
Common buying mistakes and how to prevent them
Buying by enclosure dimensions
A longer container does not automatically provide more usable IT capacity. Require rack layouts, service clearances, cooling conditions, and the actual IT-load limit.
Confusing UPS rating with IT capacity
Require the bidder to separate utility input, UPS output, cooling capacity, losses, and usable IT load at the selected redundancy mode.
Assuming a modular label guarantees expansion
Ask for the maximum module count, spare feeders, busway provisions, cooling-plant headroom, foundation loads, controls architecture, and shutdown procedure for each expansion step.
Leaving civil work until after purchase
Transport weight, lifting points, pad loads, drainage, access, and crane clearance can determine whether a selected module fits the site. Approve the logistics and foundation design before the factory releases final drawings.
Ignoring liquid-cooling interfaces
If future racks may use rear-door or direct-to-chip cooling, reserve the headers, pumps, heat rejection, leak detection, isolation, and monitoring from the first design. A room designed only for air may not accept high-density liquid equipment without major work.
Accepting an unqualified cost or schedule promise
Require a dated, configuration-specific breakdown. Separate factory manufacture from permitting, civil construction, utility upgrades, transport, commissioning, and operational handover.
What a complete proposal should leave you with
At award, the supplier should have converted your requirements into a coordinated package: an equipment list; rack and RU schedule; IT and facility-load calculations; one-line and protection studies; cooling and containment schematics; fire and safety design; foundation and transport loads; utility, fiber, pipe, and cable interfaces; monitoring points; redundancy and failure-mode descriptions; factory and site test procedures; maintenance clearances; spare parts; and a documented expansion plan.
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If those documents cannot show how the first module reaches its stated IT load, how it behaves during a component failure, and how the next module connects without an avoidable outage, the product is not yet a buying decision—it is only a capacity headline.
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