Caterpillar 3516E
2,500-3,000 ekW standby diesel genset, the newest 3500-series generation built for hyperscale halls
Caterpillar 3516E is one of 10 data center generators tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
Caterpillar 3516E diesel genset dossier: 2,500-3,000 ekW ratings, verified specs, market scarcity analysis, and surplus-unit inspection checklist.
Why it matters
The 2.5-3 MW node is where new data center standby design is consolidating, and the 3516E is its CAT flagship. Zero public price discovery is itself the intelligence: surplus units clear instantly on request while the nearest proxy, a 3516C HD, asked 799,500 USD. A sourced dossier on this model positions SecondWatt as the reference where no pricing reference exists.
Who buys it
Hyperscalers, large colocation operators, and their EPCs buy 3516Es in multi-unit standby fleets; utilities and campuses take the 3 MW node where fewer units mean simpler paralleling. The trigger is scarcity: new units queue 50-110 weeks, the used channel is empty, and the two documented surplus units both sold without ever publishing a price.
Role in the data center
Hyperscale standby block at 2,750-3,000 ekW per unit behind the paralleling bus, cutting unit count by roughly a quarter versus 2,250 kW machines in the same fleet.
Key specifications
| Standby / Mission Critical rating | 2750 ekW |
|---|---|
| Top 60 Hz standby step | 3000 ekW |
| Prime rating | 2500 ekW |
| 50 Hz range | 3000-3500 kVA |
| Engine displacement | 78.1 L (V-16) |
| Bore x stroke | 170 x 215 mm |
| Compression ratio | 14.7:1 |
| Fuel at 100% load, 2750 ekW standby | 645.8 L/hr |
| Fuel at 75% / 50% load | 505.8 / 370.6 L/hr |
| Voltage options | 416-13800 V |
| Dimensions | 7922 x 2640 x 3342 mm |
| Dry weight | 18480 kg |
| Emissions certification | EPA Tier 2, emergency stationary |
| Data center compliance | Uptime Tier III/IV; TIA-942 Rated 1-4 |
| Controls | Cat ECS 100/200; EMCP 4.4 |
Technical summary
Standby / Mission Critical: 2750 ekW (3438 kVA) Top 60 Hz step: 3000 ekW standby Prime: 2500 ekW (3125 kVA) 50 Hz: 3000-3500 kVA; 2200 ekW prime at 1500 rpm Engine: 78.1 L V-16, 170 x 215 mm, CR 14.7:1 Fuel at 100% / 75% / 50% (2750 ekW standby): 645.8 / 505.8 / 370.6 L/hr Voltages: 416-13800 V Dimensions: 7922 x 2640 x 3342 mm Dry weight: 18480 kg Emissions: EPA Tier 2, emergency stationary Controls: Cat ECS 100/200, EMCP 4.4 options Compliance: UL 2200, Uptime Tier III/IV, TIA-942
Configurations and options
Sold new as open units or in packager enclosures with sub-base tanks; the two documented surplus units were 13,200 V high-voltage builds with EMCP 4.2 panels. Options: ECS 100/200 controls, SR5 medium-voltage alternators, dual starters, and Low NOx configuration for permit-sensitive sites.
Compatibility and dependencies
Requires 3,438 kVA-class paralleling switchgear, bulk fuel sized to 645.8 L/hr full-load burn, and medium-voltage integration on HV builds. Emissions posture is Tier 2 emergency only; non-emergency duty needs packager aftertreatment. ECS/EMCP 4.4 controls integrate with modern BMS platforms directly.
Pricing and availability
Comparable secondary-market band: 400000–850000 $ per unit. Trend: up Proxies stepped up through 2026: a 2007 3516C HD at 799,500 USD, used 2,500-3,000 kW Tier 2 platforms guided at 400,000-850,000 USD, and new 2,000 kW Tier 4 packages at 1.39-1.73 million USD. Lead time, new: 50-110 weeks. Lead time, used or refurbished: on request. Warranty, used: Negotiated; CAT warranty transfer where remaining.
Common failure points
- Stored-fuel degradation — Injector fouling and hard starts on low-hour surplus units
- Generator-end insulation — Low megger readings after unpowered storage
- Turbochargers — Family wear pattern past 18,000 hours
- Cooling system — Core corrosion on stored or coastal units
- Controls software — Outdated ECS/EMCP firmware on early builds
Inspection checklist
Provenance — confirm build year and rating letter on the nameplate; the fleet is young and 2017-era surplus units dominate Hours — most surplus 3516Es show under 1,000 hours; verify meter against commissioning and test logs Storage condition — for surplus units, verify heater power, rotation logs, and desiccant service during storage Injectors — verify service records; 3500-family fouling emerges past 4,380 hours on degraded fuel Turbochargers — inspect for shaft play and oil in the intake; family wear point past 18,000 hours Aftercooler and cooling cores — inspect for corrosion; verify coolant service within 6,000 hours Generator end (SR5) — megger stator; below 5 megohms indicates insulation risk on stored units Controls — confirm ECS 100/200 or EMCP 4.2/4.4 generation and software support status High-voltage gear — on 13,200 V builds, test alternator, PTs, and protection relays before energizing Emissions nameplate — verify Tier 2 emergency certification matches the destination permit; Low NOx build where required Batteries and charger — verify bank age against the 8,760-hour replacement norm Fuel system — inspect day tank and polish stored fuel; stale fuel is the top failure driver on low-hour units Warranty — confirm any remaining Caterpillar warranty transfer terms in writing Load test — 4-hour run to 100% of nameplate at temperature; require a witnessed test on surplus units Records — factory test certificates, commissioning reports, and storage logs; gaps reprice the asset
Procurement channels
Surplus 3516Es surface through specialist brokers (React Power, Turnkey Industries) from cancelled projects and clear on request without published pricing. New units route through CAT dealer allocations. SecondWatt inquiry channels and dealer relationships matter more here than listings, which effectively do not exist.
Regional notes
60 Hz North American allocations dominate; 50 Hz builds (3,000-3,500 kVA) serve export markets. High-voltage 13,200 V surplus units are documented in the US. Emissions siting follows the Tier 2 emergency framework with district-level Tier 4 mandates emerging.