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A data center UPS carries the critical load for seconds or minutes; the backup generator carries the outage for as long as the site must operate. Buy and size them as one system: begin with measured facility kilowatts, specify the UPS ride-through for generator start and a failed-start retry, select a generator rating with no prohibited runtime limit, then size fuel, switchgear, cooling and emissions controls for the same operating scenario.
The most expensive mistakes are using server power-supply nameplates as the load, treating standby kW as continuous kW, assuming a five- or 15-minute battery rule is universal, and counting engine units without checking shared fuel, controls and distribution. This guide gives the engineering sequence, ratings, code distinctions and procurement checks needed to avoid those errors.
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What does a data center UPS do when utility power fails?
The UPS prevents the IT load from seeing the utility interruption while the generator plant starts. The normal sequence is:
- Utility voltage fails or leaves the UPS input tolerance window.
- The UPS inverter immediately supplies the critical load from its energy store.
- The automatic transfer switch (ATS), or paralleling switchgear, sends a start command to the generator plant.
- The engine cranks, reaches acceptable voltage and frequency, and the transfer equipment closes.
- The UPS returns to rectifier operation and stops discharging the battery or flywheel.
- Mechanical loads that were not on the UPS restart in a controlled sequence.
- After utility power is stable, the load retransfers and the generator cools down.
GTech Engineering describes the UPS as both a ride-through device and a power-quality barrier that isolates IT equipment from sags, surges and transients (power-path overview). Battery runtime is therefore usually measured in minutes, not hours: enough time for generator start, transfer, voltage and frequency settling, plus a retry if the first start fails.
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Do not confuse two transfer figures. When both sources are already live, an ATS transfer is commonly 50–200 milliseconds (about three to 12 cycles at 60 Hz). When the backup source is a generator, the ATS first sends the start signal; the set may need five to 10 seconds to reach stable output before transfer. A vendor’s zero-to-15-second crank-to-start figure describes the engine, not the complete utility-to-generator sequence.
How do you size a UPS for a data center?
Size the UPS from measured critical-load kW, convert that load to kVA using the selected UPS output power factor, set runtime from the actual generator-start sequence, and then apply the chosen redundancy architecture. The pass/fail test is the required end-of-life battery capacity at the design temperature, not the minutes printed on a new-battery brochure.
1. Establish the real critical load
Use monitored demand data, an electrical model based on actual IT equipment, or the manufacturer’s published maximum input for equipment that has not yet arrived. Do not add the ratings printed on server power supplies: those ratings describe the supply’s capacity and commonly exceed the server’s operating draw.
Put every load that must remain energized through the interruption on the UPS list. That normally includes IT racks, network and security systems, controls, selected CRAH or CDU fans, pumps and controls needed to keep room conditions safe while chillers restart, and UPS auxiliaries. Keep chillers and other large mechanical loads on the generator unless the operating concept specifically requires them on UPS.
Density changes the result. Traditional enterprise racks range from a few kilowatts into the low teens, while some liquid-cooled GPU systems are specified above 100 kW per rack. Cooling, lighting, controls and distribution losses are in addition to the IT figure. The load schedule must state whether battery recharge is permitted during the event or is inhibited until the utility returns.
2. Convert kW to the UPS kVA rating
The relationship is kVA = kW ÷ output power factor. Many current three-phase UPS systems are rated at unity power factor, but many installed frames are not. Assuming unity power factor when replacing a legacy frame can understate the required kVA and bypass capacity. Use the power factor in the exact UPS datasheet, not a generic value.
3. Set runtime from the generator sequence
Write the timing as a requirement: detection delay, start signal, crank time, warm-up, voltage and frequency stabilization, ATS or paralleling-switchgear transfer, UPS input-window acceptance, mechanical restart, and a failed-first-start retry. Add a stated engineering margin and evaluate the battery at its specified end-of-life capacity. A string that supplies the target minutes when new but misses them at end of life has failed the requirement.
A five-minute battery is a practical starting point for many generator-backed systems, but it is not a universal code or tier rule. A consulting engineering guide repeats a 15-minute statement for Tier III and Tier IV, yet the retrieved Uptime topology standard does not impose a 15-minute battery minimum. Uptime specifies topology and on-site fuel; it does not replace a site-specific ride-through calculation. Keep any longer hold-up—such as an orderly shutdown without generator power—as a separate owner requirement.
4. Check the operating point, not peak efficiency
Redundancy puts each UPS module below its nameplate. Double-conversion efficiency falls at light load, so compare the manufacturer’s efficiency curve at the expected normal, maintenance and failure-case loading. A design that looks efficient at 100 percent can consume materially more heat-rejection capacity when four modules share a lightly loaded redundant load.
Which UPS topology and energy store fit a data center?
For a data hall, voltage-and-frequency-independent (VFI) double conversion is the normal critical-load class because it continuously regenerates the output waveform. Voltage-independent (VI) line-interactive equipment is common at network closets and edge installations; voltage-and-frequency-dependent (VFD) standby units suit workstations, not a data hall. These classifications and their IEC 62040-3 mapping are summarized in SecondWatt’s UPS selection guide.
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| Choice | Where it fits | Trade-off to specify |
|---|---|---|
| VFI double conversion | Primary data-hall critical load | Best isolation and waveform control; conversion losses and heat must be managed |
| Eco or high-efficiency mode | Only where the operating policy allows bypass operation | Recovers conversion losses but introduces a transfer when input leaves tolerance; document the allowed mode |
| Rotary UPS | Large blocks where mechanical ride-through and battery-room reduction are priorities | High capital cost and mechanical maintenance |
| Diesel-rotary UPS (DRUPS) | Sites that want the engine and ride-through integrated | Architecture choice, not a drop-in replacement for a static UPS plus separate generators |
Compare storage by the requirement
- VRLA: Lowest initial price, largest footprint and shortest service life among the common choices. Float temperature dominates life. Specify IEEE 1188 maintenance, temperature control and a replacement cycle in the acquisition case.
- Vented lead-acid: Less common in sealed modern halls; ventilation and IEEE 450 maintenance are part of the installation.
- Lithium-ion (including NMC and LFP): Smaller and lighter with longer cycle and calendar life, but requires a battery-management system, thermal design and a fire-code review under NFPA 855. That review is a real installed-cost item.
- Flywheel: Useful when the only duty is bridging a reliably starting generator. It avoids calendar-chemistry fade but is a poor fit for a contractual long hold and requires mechanical maintenance.
- Service-entrance BESS: An energy asset sized in hours that can provide peak shaving or reduce generator runtime. It is not a sub-cycle UPS and does not replace the critical-path ride-through device.
For a used or refurbished UPS, treat power electronics, DC capacitors and the energy store as three aging assets. Request capacitor-replacement records, a capacity test under IEEE 1188 or IEEE 450 as applicable, firmware-support status and the service-contract position. If no capacity test exists, price the battery string as a replacement.
How should UPS redundancy be specified?
Redundancy applies to the entire power path, not just the UPS cabinet.
- N: Exactly the capacity required by the load; a single failure or maintenance event affects the load.
- N+1: One spare module or set; any single-unit failure or maintenance event is covered.
- 2N: Two independent paths, each able to carry the full critical load.
- 2(N+1): Two independent paths, each with its own spare.
- Distributed or block redundancy: Several systems share the load so one can fail, or a reserve block picks up a failed block through transfer equipment.
A 2N UPS connected to one shared switchboard, fuel pump, control network or generator bus is not a 2N outcome. Dual-corded IT equipment must put one cord on each path. Single-corded equipment needs a rack transfer switch or it will still drop when its only feed fails.
For continuous loads, branch circuits are commonly held to 80 percent of breaker rating. In a 2N rack, each feed must carry the whole rack after loss of the other feed, so each side is normally operated around 40 percent or less. Verify the actual rack load and protective-device coordination rather than relying on a label.
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Every UPS should have a static bypass for internal faults and an external wrap-around maintenance bypass so the frame can be isolated while the load remains energized. Include bypass switching, distribution boards, remote power panels or busway, rack PDUs and static transfer switches in the one-line and in the failure-mode tests.
How do you size a backup generator for a data center?
Start with a timed load sequence and the generator’s continuous-duty rating, not a sum of server nameplates multiplied by a flat safety factor. The sequence must cover utility, generator, retransfer and N-1-generator modes, with UPS-backed loads, generator-transferred loads and shed loads identified separately.
The rating trap: standby kW is not continuous kW
Uptime Institute’s topology standard says Tier III and Tier IV engine generators must have no limitation on consecutive operating hours when loaded to N demand. It treats on-site generation as the primary source and the utility as an economic alternative (Tier Standard: Topology).
ISO 8528-1 terminology matters:
- Continuous (COP): No runtime limit at 100 percent rating for a constant load. It meets the hour test but can oversize a site whose peak is not constant.
- Prime (PRP): Unlimited hours only when the 24-hour average load stays at or below 70 percent of the prime rating. Meeting a no-limit promise at the actual site load can require more nameplate or derating.
- Emergency standby (ESP): No more than 200 hours per year and no more than 70 percent average power in any 24-hour period. It is suitable for the Tier I or Tier II use described by Uptime, not Tier III or Tier IV primary-source operation.
- Data Centre Power (DCP): Added to ISO in 2018, but Cummins’ analysis says its reliable-utility assumption and restriction on prolonged utility parallel operation make it unsuitable for Uptime Tier III or IV certification.
- Manufacturer DCC or site-specific unlimited-duration rating: Acceptable only when the manufacturer states the capacity, conditions and unlimited-duration basis in writing. A brochure label alone is not a certification.
Cummins’ DCC comparison bulletin explains why the distinction changes fleet count: a four-set system needing 2,500 kW DCC units would require five 2,500 kW ISO prime units to carry the same demand without a runtime limit. The same bulletin notes that low-loaded engines should generally operate above 30 percent of maximum horsepower to reduce wet-stacking and related wear. Over-provisioned N+1 or N+2 plants therefore need a permanent load bank or a documented load-bank service plan.
A concrete rating example
The Cummins DQKAN product page, read 14 November 2026, lists the following 60 Hz values:
| DQKAN rating | kW | kVA | What it means |
|---|---|---|---|
| Standby | 2,500 | 3,125 | Emergency-duty nameplate |
| Prime | 2,250 | 2,813 | Prime-duty value |
| Data Center Continuous | 2,250 | 2,813 | Continuous data-center value |
The standby-to-DCC difference is 250 kW, or 10 percent. The listed kW-to-kVA relationship is 0.8, so this alternator is not unity power factor. Confirm the exact rating, ambient and altitude derates, emissions certificate and duty statement for the selected set at the project site.
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Other published comparisons should be treated as leads to verify on the current OEM datasheet: SecondWatt reports a Caterpillar C175-16 at 3,000 ekW critical versus 2,500 ekW continuous, a Rehlko KD3250 at 3,250 kW standby versus 2,954 kW prime, and a Generac 2025 data-center diesel range of 2.25–3.25 MW emergency standby (reported comparisons). Do not enter those figures in a purchase specification until the manufacturer confirms them.
Build the load sequence
- List UPS input power, including permitted battery recharge.
- Add chillers, pumps, CRAH or CDU fans, heat rejection and mechanical controls that must restart.
- Add fuel pumps, jacket-water heaters, battery chargers, lighting, BMS and EPMS panels.
- Separate starting and running kW, motor inrush, VFD behavior and harmonic-current contribution.
- Apply only documented diversity and include a stated growth allowance.
- Choose ambient and altitude conditions from the OEM derating curves.
- Check step-load response, voltage dip, frequency recovery and harmonic distortion with the actual UPS and VFD mix.
- Iterate the staggered-start sequence against the manufacturer’s transient study; increase kW or add more stagger when the curve fails.
- Put the assumptions and acceptance limits into the commissioning script.
Generator impedance is higher than utility impedance, so UPS rectifiers and VFDs can produce more voltage distortion on generator power. Evaluate the project point of common coupling against IEEE 519-2022 and the generating-set performance requirements in ISO 8528-5. A large plant may use paralleling switchgear to synchronize several sets onto a common bus; the paralleling controller and common bus then become explicit failure domains.
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PUE can translate IT load to facility load only when the value is the design-day or peak overhead. Annual average PUE can understate the hottest-day cooling requirement. A planning illustration from BlackForge uses 48 MW of IT multiplied by a 1.35 peak overhead, producing about 65 MW of facility load; dividing by a 2.7 MW DCC unit gives 24 units at N, and eight three-plus-one blocks produce 32 sets. That is an illustration, not a formula. The electrical engineer must own the actual block size, derating and redundancy.
How much backup-generator capacity and redundancy does a campus need?
Apply the chosen topology to engines, switchgear, controls, fuel, starting systems and auxiliaries—not just to the engine count. Shared fuel pumps, a single start-air system, one filtration skid or one control network can defeat an apparent N+1 design.
For Tier III, every capacity component and distribution element must be removable for planned maintenance without affecting the critical environment. Tier IV adds physically isolated, fault-tolerant systems so N capacity remains after any infrastructure failure. All IT equipment must be dual-powered or connected through a point-of-use transfer device where the topology requires it. Test the topology while the site is actually operating on generator power.
Do not use historical availability percentages as a generator-sizing shortcut. The familiar 99.671 percent through 99.995 percent figures are historical illustrations, not the pass/fail certification test in the retrieved Uptime topology standard. Uptime also says a site takes the rating of its weakest subsystem and has no fractional tiers (standard text).
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Uptime’s topology requirement is 12 hours of on-site fuel for N capacity at Tier I, II, III and IV. That is a floor, not a promise that every owner should stop at 12 hours. Owner specifications commonly target 24, 48, 72 or 96 hours, with resupply contracts and site access designed for a regional emergency.
Count only fuel that survives the loss of the redundant component. Two 24-hour tanks that cannot both serve the surviving configuration represent 24 hours of concurrently maintainable fuel, not 48. Uptime treats pipeline natural gas as a utility, so a gas-only plant still needs the applicable on-site fuel provision.
NFPA 110 Class is a duration label: Class 48 means the emergency power supply system is designed to run 48 hours at rated load without refueling; Class X is open-ended. The 2013 edition deleted the mandatory 96-hour seismic fuel rule. Continued operation and minimum duration may still be required by another standard, permit, insurer or owner specification (NFPA 110 preview history).
Calculate usable volume from the actual fuel curve
Tank sizing is burn rate multiplied by hours, less unusable bottom volume and then adjusted for expansion, operating margin and the site’s load profile. BlackForge reports the following manufacturer-attributed curve for a 2,680 kW Cummins QSK95-based DCC set:
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| Load | Fuel use |
|---|---|
| 25% | 201 L/h |
| 50% | 363 L/h |
| 75% | 514 L/h |
| 100% | 664 L/h |
At 664 L/h, 96 hours is about 64,000 liters (roughly 16,800 US gallons) of usable fuel for one set before margins. That curve belongs to that engine and rating; it is not a universal liters-per-kWh factor. Redundant blocks normally operate below full load, so model the expected load profile rather than multiplying every nameplate by the full duration.
Petroleum diesel can degrade during storage. Include fuel sampling, polishing, turnover, water removal and a resupply plan. A contract is useful only if tankers can reach the fill points during a flood, storm or regional fuel shortage, preferably from more than one terminal.
What emissions rules apply to backup generators?
EPA engine-emission tiers and Uptime facility tiers are unrelated. A Tier 4 engine does not make a building Uptime Tier IV, and an Uptime Tier IV topology does not determine the engine’s emissions certificate.
US stationary reciprocating engines are regulated through NESHAP 40 CFR Part 63 Subpart ZZZZ, NSPS Subpart JJJJ for spark-ignition engines and NSPS Subpart IIII for compression-ignition engines. Applicability depends on new versus existing status, horsepower, major versus area source and engine type (EPA stationary-engine overview).
For the emergency-engine class described by EPA, emergency operation is broadly unlimited during events such as an outage, fire or flood. Maintenance and readiness testing are capped at 100 hours per calendar year, with up to 50 hours available for specified non-emergency situations and additional restrictions where a financial arrangement exists. The exact subpart and permit must be identified for the engine being purchased.
Do not confuse that 100-hour operating rule with EPA’s older 500-hour potential-to-emit assumption. EPA’s Clean Air Act data-center page describes 500 hours as a default permitting estimate for worst-case emergency operation, not as permission to run 500 maintenance hours (EPA data-center resources).
State requirements can be stricter and are changing. Retrieved guidance describes Oregon incentives for Tier 4 or Tier 2 plus selective catalytic reduction, a Washington draft general order aimed at Tier 4, Virginia requirements and guidance that must be confirmed against the enacted text, and an Illinois Tier 4 date reported for applications after 1 December 2026. Treat those as a pre-RFQ legal check, not settled nationwide rules. Confirm the current state and local permit text before selecting engine, SCR, diesel particulate filter, exhaust backpressure, urea storage or continuous-emissions-monitoring equipment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which NFPA and NEC requirements should be in the specification?
NFPA 110 uses three separate concepts: Level describes the consequence of failure, Type describes speed (Type 10 means power returns within 10 seconds), and Class describes hours at rated load without refueling. A Type 10 classification is not a promise that every data-center generator is legally a Level 1 system.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitches- NEC Article 700: Emergency systems such as egress lighting and fire alarm.
- NEC Article 701: Legally required standby systems.
- NEC Article 702: Optional standby systems; IT loads commonly fall here.
- NEC Article 708: Critical operations power systems when designated by the authority having jurisdiction.
Keep life-safety loads under Article 700 separate from optional IT loads under Article 702, with their own transfer equipment and wiring. NFPA 110 covers generator, fuel and transfer-system upkeep; NFPA 37 covers engine and fuel-system installation; NFPA 111 addresses stored-energy systems serving emergency and life-safety loads; NFPA 855 covers lithium battery energy storage; NFPA 70B covers ongoing electrical-equipment maintenance; and NFPA 75 covers IT equipment rooms.
FacilityOps’ summary of NFPA 110 calls for monthly generator exercise of at least 30 minutes at sufficient load to reach operating temperature and monthly ATS operation. Level 1 systems also receive a longer load test at least every 36 months. Records should show date, operator, duration, load and defects. Include recovery for a control switch left out of Auto, failed block heaters, weak starting batteries or chargers, degraded fuel, an ATS left in test or bypass, and alarms that were acknowledged but not cleared (NFPA 110 explainer).
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What studies and commissioning evidence should the purchase include?
Require the following studies in utility, generator, UPS-bypass and maintenance configurations:
- Short-circuit analysis, because generator fault current is lower than utility fault current.
- Protective-device coordination and selective-coordination verification where required.
- Arc-flash analysis to IEEE 1584 with NFPA 70E labels; update it after system changes and review it at least every five years.
- Load flow and voltage-drop analysis for normal, maintenance and failure states.
- Generator transient, harmonic and step-load analysis using the actual UPS rectifiers, VFDs and motor starts.
Commissioning should include factory tests; site start, synchronization and load sharing; load-bank steps that follow the design sequence; an integrated UPS-plus-generator test; staggered mechanical restart; and safe simulations of fuel, control and starting-battery failures. Integrated systems testing should remove utility power and observe generation, UPS behavior, cooling recovery and alarms as one script. Verify room temperature and cooling recovery against the project’s ASHRAE class, because generator success is also an environmental result.
Documents to demand with each offer
- Engine and alternator identity, manufacture records and duty-rating basis.
- Ambient and altitude derating curves and transient-test documentation.
- Hours, starts and service history for any non-new set.
- Emissions certification for the intended jurisdiction and duty.
- Fuel, exhaust, urea, controls and auxiliary interfaces.
- Installation drawings, weights, shipping splits, clearances, crane paths and service access.
- Itemized scope, exclusions, warranty, delivery and commissioning responsibilities.
- Evidence that the rating has no consecutive-hour limit at the stated N demand where Tier III or IV operation requires it.
Compare complete systems. A generator-set price does not include paralleling switchgear, fuel storage, enclosure, aftertreatment, exhaust, site distribution or commissioning.
What does a data center generator cost?
Only limited secondary-market asking prices are available in the available data, and they are not installed project costs. SecondWatt reported, on 31 May 2026, approximately $685,500 for a Cummins DQKAB and $666,765 for an MTU 16V4000 DS2000, both described as 2,000 kW standby Tier 2 sets. Such sets are usable only where the permit and duty basis allow that rating. Prices checked November 2026 should be treated as moving asking prices; an installed plant adds switchgear, fuel, emissions equipment, civil work, controls and commissioning.
What is the safest buying sequence?
- Confirm the required Uptime topology, code classifications, insurer criteria and authority-having-jurisdiction requirements.
- Measure or model IT, mechanical, controls and auxiliary loads in normal, startup and failure modes.
- Define which loads are UPS-backed, generator-transferred or shed.
- Select VFI, rotary or DRUPS architecture and storage technology from the ride-through requirement.
- Set battery runtime from the complete generator-start sequence and end-of-life capacity.
- Choose generator duty rating from the intended hours, not the standby headline.
- Apply N, N+1, 2N or distributed redundancy to engines, paths, fuel and controls.
- Run transient, harmonic, short-circuit, coordination, arc-flash, load-flow and voltage-drop studies.
- Check federal, state and local air permits before freezing the engine and aftertreatment package.
- Size tanks from the actual fuel curve, usable volume, owner autonomy and resupply route.
- Write factory, site, integrated-systems and failure-simulation tests into the contract.
- Require rating letters, emissions certificates, service records, drawings, exclusions and commissioning deliverables before award.
The governing principle is simple: the UPS bridges the start; the generator sustains the event. A credible design connects the two through measured loads, a written rating basis, concurrently maintainable redundancy, defensible fuel autonomy and a permit that matches how the plant will actually run.
Frequently Asked Questions
Can a battery energy-storage system replace the UPS in a data center?
Usually not. A UPS is a sub-cycle power-quality device in the critical path, while a service-entrance BESS is an hours-scale energy asset for functions such as peak shaving or reducing generator runtime. A BESS can complement the UPS, but it does not remove the need to prove ride-through, transfer and bypass performance.
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Does a Tier IV data center legally require 96 hours of diesel fuel?
No universal Tier IV rule in the retrieved Uptime topology text requires 96 hours; it specifies 12 hours of on-site fuel for N capacity. Owners often choose 48–96 hours for operational resilience, and permits, insurers or local standards can impose more, so the project basis must state the chosen duration and concurrently maintainable tank volume.
Can pipeline natural gas be the only backup-fuel strategy?
Uptime treats pipeline natural gas as a utility for its topology analysis, so a gas-only plant still needs the applicable on-site fuel provision. Whether gas is acceptable also depends on utility reliability, local code, air permitting and the owner’s outage assumptions.
What voltage should a new data hall distribute to racks?
North American halls commonly use 415/240 V or 208 V distribution. Higher-voltage 415/240 V distribution can remove a transformer inside the floor PDU and provide more power per circuit, but every server and power supply must be verified for the selected voltage before the design is frozen.
How should a fuel-resupply contract be tested?
Specify delivery access during the same regional emergency used for the autonomy calculation: tanker turning and fill points, alternate routes, more than one supply terminal where practical, fuel-quality testing, polishing and the priority of the data center’s deliveries. A nominal hour count is not useful if trucks cannot reach the tanks during a flood, storm or fuel shortage.
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