Head to head
Atlas Copco QAS 20 vs Stephill SSD6000S
The Atlas Copco QAS 20 is a silenced diesel generator, 17,5 kva prime power. The Stephill SSD6000S is a 6 kva super silent diesel generator on a two-wheel site trolley.
Last reviewed 6 October 2026
Specifications side by side
| Atlas Copco QAS 20 | Stephill SSD6000S | |
|---|---|---|
| Fuel tank | 115 litres | 24.0 Litres |
| Noise level | 60 (LpA at 7m, dB(A)) | 60dBA @ 7 metres |
| Weight | 696 / 795 (dry / wet, kg) | 210 KG |
| Prime power PRP | 17,5 / 14 (kVA / kW) | - |
| Emergency standby power ESP | 18,7 / 15 (kVA / kW) | - |
| Output | - | 6.0kVA / 4.8kW |
| Engine | - | Yanmar L100V (EU Stage V) |
Sources: Atlas Copco QAS 20, Stephill SSD6000S. 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 SSD6000S if...
Light, quiet site generator for small crews, tool power and welfare use. The trolley makes it easy to move around site. The figures below are from the maker's own page.
Full SSD6000S specifications →Common questions
What is the difference between the Atlas Copco QAS 20 and the Stephill SSD6000S?
The Atlas Copco QAS 20 is a silenced diesel generator, 17,5 kVA prime power; the Stephill SSD6000S is a 6 kVA super silent diesel generator on a two-wheel site trolley.
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