Overview#
The Atlas Copco QAS 150 delivers 120 kW of prime power from a John Deere 6068HFG05 inline-six diesel engine with 6.8 liters of displacement. The massive 335-gallon integral fuel tank provides over 43 hours of runtime at 75% load — one of the longest runtimes in the 150 kVA class.
At 70 dBA at 7 meters, the QAS 150 is notably quieter than its 100 kW sibling (QAS 125 at 73 dBA) despite the larger engine, reflecting Atlas Copco's investment in sound attenuation engineering. The unit features dual-frequency capability (50/60 Hz) and a 25-gallon DEF tank for Tier 4 Final aftertreatment.
The John Deere 6068 platform advantage#
The QAS 150 steps up to the John Deere 6068HFG05 — a 6.8-liter inline-six that is one of the most widely used industrial diesel engines in the generator industry. This platform is shared with the QAS 200, which uses the same engine block paired with a larger alternator. For fleet operators, this parts commonality between the 150 and 200 models reduces inventory complexity.
The Leroy Somer LSA 44.3 M6 alternator with AREP excitation delivers ±0.25% voltage regulation — the consistent hallmark of the QAS series. The 335-gallon fuel tank and 25-gallon DEF tank are sized for extended unattended operation, and 500-hour service intervals keep maintenance costs predictable.
Our service experience#
The QAS 150 is one of the best-balanced models in the Atlas Copco portable lineup. The combination of 120 kW output, 70 dBA sound level, and 43+ hour runtime makes it a strong choice for extended construction and temporary power deployments. The John Deere 6068 engine platform has excellent aftermarket support through John Deere's dealer network, which partially compensates for Atlas Copco's weak after-sale service.
Atlas Copco's own service network remains the brand's most significant drawback. Owners regularly report unreturned service calls, travel charges exceeding $311/hour, and multi-week waits for enclosure-specific parts. For QAS 150 owners in Northern California, OnPoint provides local maintenance and repair service — we are experienced with the John Deere 6068 platform across multiple generator brands and can service both engine and genset-level components.
