A temporary data-centre supply should be assessed against the work that creates the need for it. Identify which generators, switchgear sections or distribution paths will be unavailable and which loads remain in operation. Confirm whether the temporary source feeds a UPS, an intermediate bus or other facility infrastructure. The connection point and operating mode determine the interfaces that need review.
Account for the supporting infrastructure
Sustained IT operation can depend on cooling, pumps, controls and other auxiliaries as well as the server load. The temporary load schedule should reflect the facility’s actual dependencies and the expected recharge or restart sequence. Record the capacity available during each work stage and the consequence of losing a temporary unit or a shared component. These questions belong to the facility continuity plan.
The load is more than it equipment
- UPS input
- battery recharge
- cooling
- pumps
- controls
- essential building services
UPS interaction
- rectifier behaviour
- harmonics
- power factor
- recharge demand
- generator frequency/voltage response
Project requirements
Confirm continuity commitments and acceptance criteria in the approved project scope. Generator rental alone does not establish a data-centre resilience certification or guarantee uninterrupted operation.
Critical temporary power must be engineered with the same discipline as the permanent system it is protecting.
Test the actual continuity arrangement
Generator support to a UPS must be considered in the relevant UPS operating modes, including battery recharge and bypass. Obtain the installed UPS documentation and agree how temporary supply will be tested without assuming that a catalogue example proves compatibility.
Agree the evidence for acceptance
The responsible facility and engineering teams should define the switching plan, permitted work conditions and acceptance tests. Record the temporary source configuration, relevant settings, test conditions and observed results. A completed resistive load test alone is not proof of every UPS transition or facility operating scenario. Return to the permanent arrangement also requires a controlled handback with the appropriate verification.
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Related guidance
Engineering intent
Data Centre Rental Power should be evaluated as part of the complete power system rather than as an isolated catalogue item. Operating duty, connected load, interfaces, protection, controls, installation conditions, testing requirements and lifecycle consequences determine whether the arrangement is appropriate.
Temporary does not mean improvised
Temporary power still requires load assessment, source sizing, cables and distribution, protection, earthing, fuel planning, access, commissioning and operating responsibility. The machine may be temporary; the engineering controls cannot be.
Engineering considerations
Architecture may include rental DG, temporary cables, temporary distribution, fuel tank, load-bank test and written method statement. Critical power maintenance should be planned, documented and performed by competent personnel according to equipment type, site risk and written scope. A data-centre generator should not be considered ready merely because it starts. It is ready only when the system sequence has been tested and accepted. What is the critical IT load in kW and kVA? What is the UPS rating and current load percentage? Is the generator standby, prime or mission-critical duty? Is N+1, 2N or another redundancy philosophy required? Is there battery recharge demand after generator starts? What happens if the first generator fails to start?
Selection and design considerations
| UPS and battery systems can contain dangerous voltages even when utility power is off. | Data centre |
|---|---|
| IT load bridge, safe shutdown, generator coordination | Commercial building |
| security, IT rooms, access control, fire/security panels | Runtime meets target |
| preliminary OK, verify by testing | Runtime below target |
| increase battery / reduce load / add generator support | Critical review required |
| high-risk facility or sensitive load | If battery age or condition is unknown, recommend: For UPS with generator backup, testing may include: If runtime is too short, possible solutions include: Do not automatically add more batteries without checking UPS charger capability, battery cabinet, ventilation, protection and manufacturer limits. How much battery capacity do I need for target runtime? |
Integration and protection considerations
The goal is not merely to get off rental power quickly. It is to restore the permanent architecture correctly. The emergency-power project ends when temporary infrastructure is safely removed—not when the permanent supply first reappears. Restore according to the production and safe-recovery sequence. Healthcare temporary power must follow the facility’s defined critical-load and safety architecture. Do not assume that every hospital circuit has the same priority or interruption tolerance. The generator may need to support both IT-related demand and facility auxiliaries. Define the critical operating functions rather than attempting to support every normal-building load. When time is critical, send whatever is immediately available: Do not delay the enquiry simply because the generator size has not already been calculated.
Testing, commissioning and verification
If failure would cause only a tolerable interruption, a single generator may be appropriate. The answer should follow the consequence of failure. Simply parking a second generator nearby does not automatically create redundancy. Where several generators are required to carry the load together, the project becomes a synchronized rental-power system. Not every load needs the same continuity level. Can be removed if temporary generation becomes constrained. A planned outage should allow the temporary system to be engineered before normal power is isolated. This is significantly safer than designing temporary power after the permanent source has already been removed.
Direct answer
A temporary data-centre supply should be assessed against the work that creates the need for it. Identify which generators, switchgear sections or distribution paths will be unavailable and which loads remain in operation.
The practical decision for Data Centre Rental Power should be based on verified load, equipment, interface and site information. Where equipment-specific data, regulatory applicability or a project study is required, this guidance does not replace that verification.