The Atlas Copco QAS 250 delivers 200 kW of prime power (250 kVA) from a John Deere 9.0-liter inline-six diesel engine at 1,800 RPM. The 385-gallon integral fuel tank provides over 34 hours of runtime at 75% load, and the unit features an 800A main breaker for the full range of multi-voltage output configurations.
The Leroy Somer LSA 46.2 L6 alternator steps up from the 44.3 series used in smaller QAS models, delivering the higher output capacity needed for 200+ kW applications. At 73 dBA, the QAS 250 maintains competitive noise levels for its power class.
The QAS 250 marks the transition to the Leroy Somer LSA 46.2 series alternator — a larger frame than the LSA 44.3 used in the QAS 125 through QAS 200. The LSA 46.2 L6 delivers the higher current capacity required for 200 kW applications while maintaining the ±0.25% voltage regulation and AREP excitation system consistent across the entire QAS lineup.
This alternator platform is shared with the QAS 330, which uses the LSA 46.2 L9 variant from the same family. The John Deere 6090HFG06 9.0-liter engine is also shared between the 250 and 330, providing significant parts commonality for fleet operators running both models.
The QAS 250 enters the heavy-duty tier of the Atlas Copco portable lineup, where units are commonly deployed on large construction sites and for utility-scale temporary power. The John Deere 6090 engine is a proven 9.0-liter platform with strong aftermarket support, and the shared platform with the QAS 330 benefits fleet operators who need to stock parts for multiple units.
Atlas Copco's after-sale service continues to be the brand's primary weakness at this size class. The higher value of these units makes the service gap more impactful — downtime on a 200 kW unit is expensive, and waiting weeks for factory parts or service calls is not acceptable. For QAS 250 owners in Northern California, OnPoint provides responsive local service for both engine and genset-level maintenance.
Engineering specifications
Acoustic
Sound @ 7m, 75% load
73 dBA
Enclosure
Sound-attenuated
Fuel system & runtime
Integral fuel tank
385 gal
DEF tank
25 gal
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Get pricing & lead time on the Atlas Copco QAS 250
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
Estimated runtime
32.4 hours(1.4 days)
Fuel consumption ≈ 11.88 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 Atlas Copco QAS 250 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 fuel flow, hard starting, power loss
500+
minor
Starting battery
Failed start or slow cranking after extended storage
4,380+
minor
Coolant hoses
Weeping at clamp joints, low coolant warning
5,000+
minor
Frequently Asked Questions
What is the prime and standby rating of the Atlas Copco QAS 250?
The QAS 250 delivers 200 kW prime power and 220 kW standby power. It is the first QAS model to use the John Deere 6090 9.0-liter platform, which is shared with the larger QAS 330.
What engine does the Atlas Copco QAS 250 use?
The QAS 250 is powered by a John Deere 6090HFG06 9.0-liter inline-6 turbocharged-aftercooled diesel engine running at 1,800 RPM. The 6090 platform is shared with the QAS 330 — both models share the same engine block, enclosure, 385-gallon fuel tank, and 25-gallon DEF tank.
What are the service intervals for the QAS 250?
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 25-gallon DEF tank requires periodic refill for Tier 4 Final SCR compliance.
Is the Atlas Copco QAS 250 EPA Tier 4 Final compliant?
Yes. The QAS 250 is EPA Tier 4 Final and CARB compliant, legal for operation throughout California. The John Deere 6090HFG06 uses DOC and SCR aftertreatment with a 25-gallon DEF tank.
How does the QAS 250 differ from the QAS 330?
Both share the same John Deere 6090HFG06 engine, enclosure, 385-gallon fuel tank, and 25-gallon DEF tank. The QAS 330 extracts 264 kW prime (vs. 200 kW) through the larger Leroy Somer LSA 46.2 L9 alternator vs. the QAS 250's LSA 46.2 L6. Both operate at 73 dBA.
What fuel does the Atlas Copco QAS 250 use?
The QAS 250 runs on diesel with DEF required for SCR aftertreatment. The 385-gallon integral fuel tank provides over 34 hours of runtime at 75% load. The 25-gallon DEF tank is coordinated with the same refuel window.
Who services Atlas Copco generators in Northern California?
OnPoint Generators provides local service and maintenance for Atlas Copco QAS units including the John Deere 6090-powered QAS 250 and QAS 330. We serve the Bay Area and Northern California with faster response times than the Atlas Copco factory service network.
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