The Gillette SP-1500 is a 150-kilowatt natural gas (130 kW LPG) standby generator that fills the mid-range commercial gaseous backup slot — large enough for multi-family buildings, schools, houses of worship, and light-industrial facilities. At this power class, it competes directly with the Kohler KG150 and Generac SG series.
Like all Gillette SP Series units, the SP-1500 uses industry-standard name-brand components: a PSI 8.8-liter turbocharged and charge-air-cooled V8 engine (537 cubic inches), Stamford UCI274G alternator, and Deep Sea Electronics DSE 7420 MKII controller. Every unit is assembled and 100% load-tested at Gillette's factory in Elkhart, Indiana.
The SP-1500 steps up to PSI's 8.8-liter turbocharged V8 — a 537-cubic-inch industrial gas engine purpose-built for stationary power generation. This is PSI's workhorse platform for the 130-200 kW range, with turbocharging and charge air cooling to extract 259 brake horsepower on natural gas at 1800 RPM.
Key characteristics of the 8.8L TCAC platform:
Electronic governor with isochronous frequency regulation (1/4% steady-state)
Turbocharged and charge air cooled for higher power density
Electronic fuel injection for consistent air/fuel ratio across load range
Catalytic converter compatible for sites requiring additional emissions control
10.1:1 compression ratio optimized for gaseous fuel efficiency
The 8.8L V8 shares component-level commonality with the larger SP-2000P (which uses a high-output variant of the same block), so parts and service knowledge transfer across models.
The PSI 8.8L is a well-documented industrial engine with straightforward service access. The DSE 7420 MKII controller is the same platform we see across many generator brands — no proprietary software or dealer-locked diagnostics. At 150 kW, parts availability through industrial distributors is solid for PSI and Stamford components. We recommend keeping critical spares on-site since there is no local Gillette dealer in Northern California: spark plugs, oil filters, air filter, and a replacement battery.
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
1,575,000 BTU/hr≈ 1575.0 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 SP-1500 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 250 hours or 12 months
Coolant change
Every 4000 hours
Air filter
Every 1000 hours
Spark plugs
Every 1500 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
Spark plugs / ignition
Misfire under load, hard starting
1,500+
minor
Battery
Failed to start during outage
8,760+
minor
Coolant system
Overtemp, coolant loss
6,000+
minor
Frequently Asked Questions
How does the SP-1500 compare to Kohler KG150?
Both are ~150 kW gaseous standby units at 1800 RPM. The SP-1500 uses a PSI 8.8L turbocharged V8 (537 ci) while Kohler uses their own turbocharged inline-6. At 150 kW, Kohler has better dealer network coverage in Northern California, but Gillette offers open-architecture components (PSI engine, Stamford alternator, DSE controller) that any qualified technician can service.
Does the SP-1500 come in single-phase?
Yes — the SP-1500 is available in both single-phase (120/240V, 130 kW LPG / 150 kW NG at unity power factor) and three-phase configurations (120/208V, 120/240V, 277/480V, 346/600V at 0.8 power factor). Single-phase units use a dedicated 4-lead winding; three-phase units use 12-lead reconnectable windings.
What controller does the SP-1500 use?
Deep Sea Electronics DSE 7420 MKII — an industry-standard auto mains failure controller with Modbus communication, digital metering, event logging, and remote monitoring capability. Same controller platform used across many generator brands.
Is the SP-1500 NFPA 110 compliant?
Yes — the SP-1500 is UL 2200 listed and configurable for NFPA 110 Level 1 when supplied with the required alarm contacts, battery monitoring, and fuel supply provisions.
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.
