The Doosan G150 extracts 123 kW of prime power (154 kVA) from a higher-output Cummins QSB5-G12 variant on the same 4.5-liter platform and chassis as the G125. At 68 dBA and 6,990 lbs, the G150 provides a 23% power increase over the G125 without changing the footprint.
This model fills the gap between the G125 (100 kW) and G190 (145 kW), offering buyers a step-up option without jumping to the significantly larger DualBox-enclosed G190 chassis. Also sold as the Bobcat PG150.
Cummins QSB5 platform and chassis commonality with G125#
The G150 shares everything with the G125 except the engine tune — the QSB5-G12 variant extracts 23% more power from the same 4.5-liter displacement through higher boost and fueling. This means identical filters, identical service procedures, and interchangeable enclosure panels for fleet operators running both models.
Like the G125, the G150 achieves Tier 4 Final without a DPF. For buyers considering the step up to the G190, note that the G190 moves to the significantly larger DualBox enclosure (224" x 83.2" vs. the G150's compact chassis) and a Cummins QSB7 6.7-liter engine — a meaningful jump in size and weight from 6,990 lbs to 11,377 lbs.
OnPoint services Doosan G150 units alongside G125s in Northern California fleets. The shared QSB5 platform means our technicians carry the same filters and follow the same procedures for both models. The G150 is the highest-output generator Doosan offers before stepping up to the DualBox enclosure design, making it the right choice for operators who need more than 100 kW but want to stay within a compact, lighter-weight package. Cummins parts availability in the Bay Area is excellent through multiple distributors.
Engineering specifications
Physical
Wet weight
6,990 lb
Acoustic
Sound @ 7m, full load
68 dBA
Enclosure
Sound-attenuated
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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.
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Estimated runtime
27.4 hours(1.1 days)
Fuel consumption ≈ 7.29 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.
Service intervals
Manufacturer-recommended intervals for the Doosan G150 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 500 hours or 12 months
Air filter
Every 500 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 hours
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
Fuel filter
Restricted flow, hard starting, power loss under load
500+
minor
Battery
Failed to start or slow cranking after extended storage
4,380+
minor
Coolant hoses
Weeping at clamp connections, slow coolant loss
5,000+
minor
Frequently Asked Questions
What is the standby power rating of the Doosan G150?
The Doosan G150 delivers 135 kW standby and 123 kW prime power. It shares the same Cummins QSB5 engine platform and chassis as the G125, providing a 23% power increase without changing the footprint. Also sold as the Bobcat PG150.
What engine does the Doosan G150 use?
The G150 is powered by a Cummins QSB5-G12 4.5-liter inline-4 turbocharged-aftercooled diesel engine running at 1,800 RPM. The QSB5-G12 is the higher-output variant of the same 4.5-liter platform used in the G125, achieving EPA Tier 4 Final without a DPF.
What are the service intervals for the Doosan G150?
Oil changes are due every 500 hours or 12 months, whichever comes first. Air filter and fuel filter replacement intervals are 500 hours. Major engine overhaul is specified at 20,000 hours. The G150 shares all service items with the G125, simplifying fleet maintenance.
Is the Doosan G150 EPA compliant?
Yes. The G150 is EPA Tier 4 Final compliant. The Cummins QSB5-G12 achieves compliance through DOC and SCR aftertreatment — no diesel particulate filter required, eliminating regeneration cycle management.
How does Doosan compare to MQ Power at the 150 kVA class?
Both deliver comparable power in the 150 kVA class. The G150 typically prices 15-30% below MQ Power while using the same Cummins QSB5 engine. The G150's no-DPF configuration is a maintenance advantage over DPF-equipped competitors in this class.
What control panel does the Doosan G150 use?
The G150 uses the same integrated digital control panel as the G125, with auto-start, fault monitoring, voltage/frequency display, runtime tracking, and DEF level monitoring for SCR aftertreatment.
Who services Doosan generators in Northern California?
OnPoint Generators services Cummins QSB5-powered Doosan generators across the Bay Area and Northern California. The G150 and G125 share all service procedures, so fleet operators running both models benefit from a single service visit with common parts.
Similar models
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