Atlas Copco Generators for Rental and Jobsite Power

Atlas Copco designed its mobile diesel generators with rental companies and contractors in mind. The QAS range for the US market spans nine core models, each running a Tier 4 Final engine from Isuzu, John Deere, MTU, or Volvo depending on size, and each available on an integrated trailer or a skid. Enclosures are sound attenuated and built to resist weather and corrosion, and larger models can run up to 40 hours on a single tank. That profile makes Atlas Copco a natural fit for construction sites, rental fleets, mining operations, oil and gas sites, event power, and utility work. These are applications where the generator moves between locations, carries load for long stretches, and gets handled by crews who need it running within seconds of arrival.

Atlas Copco QAS Generator Sizes

The QAS lineup runs from roughly 20 kW to 560 kW prime. Here is how the models group and which size ranges to shop for each.

Model Class	Prime Output	Shop This Size
Small (QAS 25, 45, 70)	20 kW to 56 kW	20kW – 24kW, 25kW – 49kW, 50kW – 74kW
Mid-size (QAS 95, 125, 150)	76 kW to 120 kW	75kW – 99kW, 100kW – 249kW
Large (QAS 250, 330)	182 kW to 264 kW	100kW – 249kW, 250kW – 374kW
Specialty (QAS 625, 700)	500 kW to 560 kW	500kW – 669kW

The figures above are Atlas Copco’s published prime ratings. Standby ratings on the same machine run higher, so a listing may show a larger kW number depending on how the unit is rated. Confirm which rating applies before comparing an Atlas Copco unit against another brand.

Paralleling Atlas Copco Units

One of the stronger arguments for this brand is how well its generators work together. Atlas Copco’s Power Management System coordinates paralleled units with load demand, starting additional generators as load climbs and shutting them down as it falls. That keeps each machine operating at a load level that protects the engine, rather than one oversized generator running lightly for hours. It also gives fleet owners flexibility. Three mid-size units can combine to carry a large job, then split up and go to three separate sites the following month, which a single large generator cannot do.

Why Rental Fleets Own Their Atlas Copco Units

Renting fits a single project with a defined end date, or a situation where you need power next week without a purchase cycle. Our rental division, Stag Power Rentals, handles that side of the business. Buying wins once the equipment stays busy. Contractors running a unit across back-to-back jobs usually find that a year of rental payments approaches the price of an inspected used machine, and rental companies building their own fleet are buying by definition. Used Atlas Copco units narrow the capital gap considerably, and our generator financing options close the rest of it.

Sizing an Atlas Copco Generator

Start with every load that runs at the same time, then separate resistive loads like lighting from inductive loads like pumps and compressors. Motors draw several times their running current at startup, and that surge is what most often forces a larger unit than steady-state math suggests. Our power calculators will get you a working estimate, and you can compare every available output on our shop by kW page. If you would rather hand off the math, our team runs load calculations at no charge.

Load Bank Testing on Rental-Fleet Atlas Copco Units

Every Atlas Copco generator we sell passes a 22-point inspection and load bank testing before shipment, so it arrives verified under load rather than on a spec sheet. We have been buying and selling industrial generators for more than a decade. Every purchase, new or used, is backed by our 30-day IronClad warranty. After delivery, our service team handles preventative maintenance and electrical repair for the life of the equipment. Comparing brands? Multiquip generators and Doosan generators compete in the same mobile prime power segment, and our shop by brand page covers every manufacturer we carry.

Ready to Buy an Atlas Copco Generator?

Tell us what you are powering, how long it will run, and whether it needs to move between sites, and we will match you to the right Atlas Copco unit. Browse our full inventory of industrial generators or contact us to talk it through.