What is the standby rating of the NG350-02?

The Blue Star NG350-02 is rated 350 kWe standby on natural gas at 60 Hz / 1800 RPM. The PSI 14.6LHO (high-output) V8 produces 536 bHp (400 kWm) at standby. There is no LP rating — the NG350-02 is a natural-gas-only model.

Why is there no LP rating on the NG350-02?

The NG350-02 uses the PSI 14.6LHO high-output variant of the 14.6L V8, tuned specifically for natural gas at 350 kWe. At this output level, LP fuel's lower volumetric energy density does not support the same standby rating, and Blue Star does not publish an LP rating for this model. For LP operation at similar kW, consider the NG300-01 (200 kWe LP standby) or NG400-01 (300 kWe LP standby).

How does the 14.6LHO differ from the standard 14.6L in the NG265/NG300?

The PSI 14.6LHO is the high-output variant of the 14.6L V8, rated 536 bHp (400 kWm) vs. 456 bHp (340 kWm) for the standard 14.6L. Both share the same 891 cu in (14.6L) displacement, 5.04-inch bore x 5.59-inch stroke, and 10.5:1 compression — the difference is in fuel system calibration and boost pressure to achieve higher natural gas output.

What alternators does the NG350-02 use?

For 208V and 240V three-phase, the Stamford S4L1D-F41 (WYE and DELTA respectively). For 480V three-phase, the Stamford S4L1D-E41. For 600V three-phase, the Stamford S4L1S-E4. All carry 125°C standby temperature rise and ±0.5% voltage regulation.

What are the dimensions of the NG350-02?

The OPU measures 140 x 78 x 90 in (L x W x H) and weighs 9,425 lbs — same footprint as the NG265-01 and NG300-01. Level 1 and 2 enclosures are 140 x 78 x 96 in (10,850 and 10,925 lbs). Level 3 sound-attenuated enclosure is 200 x 78 x 96 in at 11,775 lbs.

Blue Star Power Systems · PSI Large Gaseous (265-500 kW)

Blue Star NG350-02

Name: Blue Star NG350-02
Brand: Blue Star Power Systems
Availability: PreOrder

350 kW standby · Natural Gas · Liquid-cooled

350 kW natural gas standby generator from Blue Star Power Systems. PSI 14.6LHO high-output V8, DSE DCP7310 controller, structural steel base, three-phase 208-600V. Natural gas only — no LP rating.

Standby power: 350 kW
Voltage options: 120/208V, 240V, 277/480V, 347/600V
Frequency / Phase: 60 Hz · 3-phase
Engine: PSI 14.6LHO · 14.6L
EPA / Emissions: EPA Stationary Spark Ignition
Alternator: Stamford S4L1D-E41

Commercial Hospitality Government Healthcaremulti-family-largelight-industrialData Centers

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Overview#

The Blue Star NG350-02 is a 350-kilowatt natural gas standby generator built around the PSI 14.6LHO — the high-output variant of the 14.6L V8 used in the NG265-01 and NG300-01. The NG350-02 is a natural-gas-only model; no LP rating is published. It occupies the top of the 14.6L platform before stepping up to the PSI 21.9L V12 at 400 kW.

The PSI 14.6LHO high-output engine#

The 14.6LHO is differentiated from the standard 14.6L by higher fuel system calibration:

Same displacement — 891 cu in (14.6L), 5.04-inch bore × 5.59-inch stroke, 10.5:1 compression
536 bHp (400 kWm) at 1800 RPM standby — 80 bHp more than the standard 14.6L
Natural gas only — the higher boost and calibration are tuned for NG and do not support LP operation
Structural steel base, pad-type vibration isolation, 4,000W jacket water heater standard

Deration factors: 1.5% per 10°F above 77°F inlet air temperature; 2.5% per 1,000 ft above 1,200 ft altitude.

Alternator configurations#

The NG350-02 is three-phase only:

Voltage	Phase	Alternator	Connection
120/208V	3	Stamford S4L1D-F41	12-lead WYE
240V	3	Stamford S4L1D-F41	12-lead DELTA
277/480V	3	Stamford S4L1D-E41	12-lead WYE
347/600V	3	Stamford S4L1S-E4	4-lead WYE

When to spec the NG350-02#

300–350 kW standby loads on utility natural gas only (no LP option)
Sites where NG supply is confirmed and LP is not a fallback fuel
Applications in the gap between 300 kW and 400 kW class where the 14.6L platform's compact footprint is preferred over the larger 21.9L V12
Note: heat rejection at 350 kW standby is 1,132,620 BTU/hr coolant — confirm mechanical room ventilation capacity before installation

Our service experience#

The 14.6LHO is a higher-demand variant of the 14.6L V8. Service procedures and parts are shared with the NG265-01 and NG300-01. The NG350-02's higher heat rejection (420,000 BTU/hr radiated to ambient vs. 324,840 for the NG265-01) requires confirmation that the installation space provides adequate ventilation airflow — 29,970 CFM for a radiator-cooled OPU installation.

Engineering specifications

Physical

Length: 140 in
Width: 78 in
Height: 90 in
Dry weight: 9,425 lb

Acoustic

Sound @ 7m, full load: 86 dBA
Enclosure: Open

Fuel system & runtime

NG required pressure: 11 in WC

Thermal & ventilation

Heat to coolant: 1,132,620 BTU/hr
Heat radiated: 420,000 BTU/hr
Exhaust flow: 1,315 CFM
Exhaust temp: 993 °F
Combustion air: 635 CFM
Ventilation air: 29,970 CFM

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Estimate runtime for the Blue Star NG350-02

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Generator size

Fuel

Load

Fuel demand at 75% load

3,675,000 BTU/hr≈ 3675.0 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 Blue Star NG350-02 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
Turbocharger	Loss of power, excessive smoke under load	12,000+	moderate
Spark plugs / ignition	Misfire at load, rough running	1,500+	minor
Charge air cooler	Reduced power output, elevated intake temps	10,000+	moderate
Battery	Failed to start during outage	8,760+	minor

Frequently Asked Questions

What is the standby rating of the NG350-02?: The Blue Star NG350-02 is rated 350 kWe standby on natural gas at 60 Hz / 1800 RPM. The PSI 14.6LHO (high-output) V8 produces 536 bHp (400 kWm) at standby. There is no LP rating — the NG350-02 is a natural-gas-only model.
Why is there no LP rating on the NG350-02?: The NG350-02 uses the PSI 14.6LHO high-output variant of the 14.6L V8, tuned specifically for natural gas at 350 kWe. At this output level, LP fuel's lower volumetric energy density does not support the same standby rating, and Blue Star does not publish an LP rating for this model. For LP operation at similar kW, consider the NG300-01 (200 kWe LP standby) or NG400-01 (300 kWe LP standby).
How does the 14.6LHO differ from the standard 14.6L in the NG265/NG300?: The PSI 14.6LHO is the high-output variant of the 14.6L V8, rated 536 bHp (400 kWm) vs. 456 bHp (340 kWm) for the standard 14.6L. Both share the same 891 cu in (14.6L) displacement, 5.04-inch bore x 5.59-inch stroke, and 10.5:1 compression — the difference is in fuel system calibration and boost pressure to achieve higher natural gas output.
What alternators does the NG350-02 use?: For 208V and 240V three-phase, the Stamford S4L1D-F41 (WYE and DELTA respectively). For 480V three-phase, the Stamford S4L1D-E41. For 600V three-phase, the Stamford S4L1S-E4. All carry 125°C standby temperature rise and ±0.5% voltage regulation.
What are the dimensions of the NG350-02?: The OPU measures 140 x 78 x 90 in (L x W x H) and weighs 9,425 lbs — same footprint as the NG265-01 and NG300-01. Level 1 and 2 enclosures are 140 x 78 x 96 in (10,850 and 10,925 lbs). Level 3 sound-attenuated enclosure is 200 x 78 x 96 in at 11,775 lbs.

Compatible equipment

Transfer switches

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