Head to head
Atlas Copco QAS 20 vs Atlas Copco QAS 45
The Atlas Copco QAS 20 is a silenced diesel generator, 17,5 kva prime power. The Atlas Copco QAS 45 is a silenced diesel generator, 43,5 kva prime power.
Last reviewed 6 October 2026
Specifications side by side
| Atlas Copco QAS 20 | Atlas Copco QAS 45 | |
|---|---|---|
| Prime power PRP | 17,5 / 14 (kVA / kW) | 43,5 / 35 (kVA / kW) |
| Emergency standby power ESP | 18,7 / 15 (kVA / kW) | 47,6 / 38 (kVA / kW) |
| Fuel tank | 115 litres | 92 / 257 (l) |
| Noise level | 60 (LpA at 7m, dB(A)) | 62 (LpA at 7m, dB(A)) |
| Weight | 696 / 795 (dry / wet, kg) | 985 / 1065 (dry / wet, kg) |
Sources: Atlas Copco QAS 20, Atlas Copco QAS 45. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the QAS 20 if...
A small 50Hz site generator for powering tools, welfare cabins and small sites, in the Atlas Copco QAS range that the maker designs for rental use. Its Kubota engine and 60 dB(A) sound pressure level at 7m suit work in built-up areas.
Full QAS 20 specifications →Buy or hire the QAS 45 if...
A mid-size 50Hz site generator for temporary power on larger sites and events, from the Atlas Copco QAS range that the maker designs for rental use. The brochure lists two fuel tank capacities for longer runs between refuels.
Full QAS 45 specifications →Common questions
What is the difference between the Atlas Copco QAS 20 and the Atlas Copco QAS 45?
The Atlas Copco QAS 20 is a silenced diesel generator, 17,5 kVA prime power; the Atlas Copco QAS 45 is a silenced diesel generator, 43,5 kVA prime power.
GetBrent is an independent directory and is not a dealer for, nor affiliated with, either manufacturer. Model and brand names are the trademarks of their owners.