DCEC Cummins L9.5 Generator Engine – 250-290 kW Diesel Power
Need a reliable L9.5 generator engine? Contact BLSH Diesel for pricing, technical drawings, and shipping to your country.
The Cummins L9.5-G is DCEC’s mid-range 6-cylinder diesel generator engine, delivering 250-290 kW of prime power for commercial and industrial generator sets. With 9.5L displacement and proven 6LTAA architecture, it fills the critical power gap between the 8.9L QSL8.9 and the 13L Z13 — ideal for factory backup, data center standby, mining camp power, and hospital generator systems.
L9.5 Generator Engine Specifications
- Configuration: 6-cylinder inline, 4-stroke diesel
- Displacement: 9.5 L (580 cu in)
- Bore × Stroke: 107 mm × 124 mm
- Rated Speed: 1500 RPM / 1800 RPM
- Prime Power Range: 250-290 kW
- Standby Power Range: 275-320 kW
- Dry Weight: 900-1000 kg
- Packing Size: 1050 × 810 × 810 mm
L9.5 Generator Engine Models
Two models cover 250-290 kW prime power, suitable for 50Hz (1500 RPM) and 60Hz (1800 RPM) generator configurations. kVA ratings calculated at 0.8 power factor.
| Model | Prime kW | Standby kW | Prime kVA | Standby kVA | Speed |
|---|---|---|---|---|---|
| 6LTAA9.5-G3 | 250 | 275 | 313 | 344 | 1500 RPM |
| 6LTAA9.5-G1 | 290 | 320 | 363 | 400 | 1500 RPM |
Model selection guide: The G3 (250 kW / 313 kVA) suits medium-load applications such as office building backup and agricultural processing plants. The G1 (290 kW / 363 kVA) provides higher output for factories, mining operations, and continuous-duty standby systems.
Applications
The L9.5-G series is engineered specifically for generator set duty, not mobile machinery. Common applications include:
- Factory backup power: Production line continuity during grid outages, 250-363 kVA range covers most medium manufacturing facilities
- Data center standby: N+1 redundant generator configurations for server rooms and IT infrastructure
- Hospital power systems: Critical load backup for operating theaters, imaging equipment, and life support systems
- Mining camp generators: Remote site power for accommodation, workshops, and processing equipment
- Commercial complexes: Shopping malls, hotels, and office towers requiring 300-400 kVA standby capacity
⚠️ Not for construction machinery: If you need a 9.5L Cummins engine for excavators, loaders, or other industrial equipment, the L9.5-G is not suitable — generator engines use constant-speed governors, while industrial engines require variable-speed torque curves.
Generator Set Integration
Frequency Compatibility
L9.5-G engines support both standard power frequencies:
- 1500 RPM: 50Hz output (China, Middle East, Africa, Southeast Asia, Australia, Europe)
- 1800 RPM: 60Hz output (North America, parts of South America)
Confirm your target market’s frequency standard before ordering. BLSH supplies both configurations with matching alternator pairing.
kVA Selection Guide
Generator set kVA = Engine kW ÷ 0.8 (standard power factor). For standby-rated generators, size with 10-15% headroom above expected peak load.
| Engine Model | Prime kW | Genset kVA (PF 0.8) | Typical Application |
|---|---|---|---|
| 6LTAA9.5-G3 | 250 | 313 kVA | Office building / farm standby |
| 6LTAA9.5-G1 | 290 | 363 kVA | Factory / data center backup |
Alternator Compatibility
The L9.5-G uses SAE J620 standard bell housing, compatible with all major alternator brands:
- Stamford: UCDI274E (313 kVA) or UCDI284C (363 kVA)
- Leroy-Somer: TAL044E or TAL044G series
- Marathon: 274M or 284M series
BLSH can supply engine-alternator matched sets with pre-tested coupling and alignment.
Maintenance Cost Comparison
| Item | Interval | Est. Cost (USD) | Notes |
|---|---|---|---|
| Oil change (28L) | Every 250 hrs | $100-150 | 15W-40 CI-4 diesel oil |
| Fuel filters (×2) | Every 500 hrs | $30-50 | Primary + secondary |
| Oil filter | Every 250 hrs | $15-25 | Full-flow cartridge |
| Air filter | Every 1000 hrs | $35-55 | Dry-type element |
| Coolant replacement | Every 2 years | $50-80 | Extended-life OAT coolant |
| Valve clearance check | Every 2000 hrs | $60-90 | Critical for generator duty |
Annual maintenance for a standby generator running 500 hours/year: approximately $350-600. Continuous prime-rated units require 20% more frequent oil changes and should follow the severe-duty maintenance schedule.
Compare with Similar Generator Engines
| Specification | Cummins L9.5-G | Yuchai YC6MK | Perkins 2806 |
|---|---|---|---|
| Configuration | 6-cyl, 9.5L | 6-cyl, 10.3L | 6-cyl, 12.5L |
| Prime Power | 250-290 kW | 250-330 kW | 260-350 kW |
| Max Standby kVA | 400 kVA | 413 kVA | 438 kVA |
| Weight | 900-1000 kg | 1050 kg | 1200 kg |
| Best For | Mid-range commercial gensets | Heavy industrial standby | Large facility backup |
The L9.5-G offers the best power-to-weight ratio in the 250-320 kW segment. For lower power below 250 kW, see QSL8.9 Generator Engines (200-320 kW). For higher power above 340 kW, step up to Z13 Generator Engines (340-415 kW).
Related DCEC Generator Engines
- QSL8.9 Generator Engines — 8.9L 6-cyl, 200-320 kW (adjacent displacement below)
- Z13 Generator Engines — 13L 6-cyl, 340-415 kW (next step up)
- QSB6.7 Generator Engines — 6.7L 6-cyl, 130-230 kW
- QSB5.9 Generator Engines — 5.9L 6-cyl, 90-176 kW
- B3.9 Generator Engines — 3.9L 4-cyl, 24-97 kW
- QSZ13 Generator Engines — 13L 6-cyl, 300-450 kW (largest DCEC genset engine)
Official Resources
- Cummins Genuine Parts — OEM filters, gaskets, and service components
Need an L9.5-G generator engine or complete genset?
Get Quote from BLSH DieselFrequently Asked Questions
What is the difference between L9.5-G1 and L9.5-G3?
The G1 delivers 290 kW prime power (363 kVA), while the G3 delivers 250 kW (313 kVA). Both share the same 9.5L block. Choose the G1 when your facility requires above 313 kVA standby capacity, or the G3 for lighter load profiles and better fuel economy at partial load.
What alternator is recommended for a 363 kVA L9.5-G1 genset?
For the G1 at 290 kW / 363 kVA, recommended alternators include Stamford UCDI284C, Leroy-Somer TAL044G, or Marathon 284M. All use SAE J620 bell housing for direct bolt-on coupling. BLSH supplies matched engine-alternator assemblies with pre-tested alignment.
Can the L9.5-G engine run on biodiesel blends?
Yes. The L9.5-G is compatible with up to B20 biodiesel (20% biodiesel, 80% petro-diesel) without modification. For higher blends like B50 or B100, consult BLSH for fuel system compatibility assessment — seals and fuel lines may require upgraded materials.
What is the fuel consumption at full load?
At rated load, the L9.5-G1 (290 kW) consumes approximately 75-80 liters per hour. The G3 (250 kW) consumes about 65-70 L/h. Actual consumption depends on load percentage, ambient temperature, altitude, and generator efficiency.
Does the L9.5-G meet EPA or EU emission standards?
DCEC L9.5-G engines are configured for non-road generator set applications. For markets requiring EPA Tier 4 or EU Stage V compliance, additional aftertreatment (SCR or DPF) may be necessary. Contact BLSH with your destination country to confirm emission certification options.
Can BLSH supply complete gensets with L9.5-G engines?
Yes. BLSH supplies both bare engines and fully assembled diesel generator sets including alternator, radiator, control panel, base frame, and exhaust silencer. We ship worldwide — email [email protected] with your kVA requirement and destination port for a quotation.
