Overview#
The Gillette SP-2500P is a 250-kilowatt natural gas / 165-kilowatt LPG stationary standby generator — the first model in the SP series to use PSI's 13L inline-6 turbocharged platform, stepping beyond the 8.8L V8 family used in the SP-960 through SP-2000P. Stamford S4L1DD alternator, DSE 7420 MKII controller, three-phase only.
At 250 kW, this unit serves large commercial and institutional facilities: hotels, larger office buildings, data centers, hospitals, and multi-building campuses where a single generator feeds critical distribution switchgear.
The PSI 13L inline-6 platform#
PSI's 13L inline-6 is a purpose-built industrial spark-ignition engine in a long-stroke configuration (5" bore × 6.5" stroke). Key characteristics:
- Inline-6 architecture — inherently balanced, vibration-free at 1800 RPM. Simpler than a V8 or V12 at similar displacement for maintenance access
- 12.54L actual displacement — Gillette designates the family as "13L" across the SP-2500P and SP-3000P
- Turbocharged and charge air cooled — boosted for high specific output; the turbo and CAC systems are engineered for sustained standby duty, not intermittent peak loads
- 10 main bearings, precision half-shell — robust bearing load distribution for long service life
- 28 qt oil capacity (31.7 qt with filter) — 2 spin-on filters for efficient oil changes at 250-hour intervals
Mechanical output: 402 bhp NG / 243 bhp LPG at standby. The large NG-to-LPG gap (250 kW vs. 165 kW) is characteristic of this turbocharged platform where fuel delivery systems are optimized for NG.
Stamford S4L1 alternator series#
The SP-2500P uses the Stamford S4L1DD-311 — a larger, 4-pole frame that Stamford uses across the 200-350 kW class. Motor starting capacity: 730 kVA at 30% voltage dip on 208-240V systems, 990 kVA at 480V. Class H insulation, single pre-lubricated bearing, direct flexible disc coupling to the engine.
Our service experience#
The PSI 13L inline-6 is a well-established commercial generator engine. The inline-6 architecture means good access to the top of the engine — spark plug changes, injector service, and valve clearance inspection are straightforward compared to V-configuration engines at similar output. This is one of the larger units we commission for commercial standby — at 8,175 lbs open, installation requires a crane or forklift. Full-load commissioning and annual load bank testing are essential at this power level.
