The Gillette PR-1800 is a 180-kilowatt prime-rated natural gas generator on PSI's 11.1L turbocharged inline-6 — a displacement unique to the prime series. This engine sits between the 8.1L (PR-1000/1300) and the 14.6L (PR-2400), delivering 272 bhp at 180 kW prime. Stamford UCID274J alternator, DSE 7420 MKII controller.
The 11.1L inline-6 does not appear in the SP standby series. PSI offers this displacement specifically for continuous-duty applications where the 8.1L is undersized but the 14.6L is over-specified. At 180 kW prime from 11.1L, the engine runs at comfortable specific loading for sustained duty.
The PSI 11.1L prime gas engine is less common than the 8.8L V8 in our territory but follows the same PSI service protocols. For continuous-duty installations, we establish structured maintenance contracts with defined 250-hour oil change windows.
Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.
Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Fuel demand at 75% load
1,890,000 BTU/hr≈ 1890.0 cf/min @ 1,000 BTU/cf
On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.
Service intervals
Manufacturer-recommended intervals for the Gillette PR-1800 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 250 hours or 6 months
Coolant change
Every 4000 hours
Air filter
Every 500 hours
Spark plugs
Every 1000 hours
Major overhaul
≈ 15,000 hours
Load bank test
Every 12 months
Common failure modes
What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.
Component
Symptom
Typical hours
Severity
Turbocharger
Power loss from continuous duty wear
10,000+
moderate
Spark plugs / ignition
Misfire, rough running
1,000+
moderate
Charge air cooler
Elevated intake temps, reduced output
8,000+
moderate
Frequently Asked Questions
What engine does the PR-1800 use?
PSI 11.1L turbocharged inline-6 — a displacement unique to the PR prime series (not used in the SP standby lineup). At 674 cu in, this sits between the 8.1L I6 (PR-1000/1300) and the 14.6L V8 (PR-2400). The inline-6 architecture provides smooth, balanced operation for sustained continuous duty at 272 bhp.
What fuel consumption at 180 kW prime?
1,980 ft3/hr NG at full load. At 75%: 1,500 ft3/hr. At 50%: 1,075 ft3/hr. Verify gas utility capacity for continuous-duty demand — 180 kW prime draws gas 24/7, not just during outages.
200 kW natural gas stationary standby generator. Made-in-USA commercial unit with PSI 8.8L high-output turbocharged V8, Stamford alternator, and DSE 7420 MKII controller. NG only.
