Cummins QuietConnect RS17A 17kW vs Cummins QuietConnect RS20AC 20kW with 200A ATS
The Cummins QuietConnect RS20AC 20kW with 200A ATS is the more powerful unit: 20,000 running watts against 17,000 — about 15% more capacity for the Cummins QuietConnect RS20AC 20kW with 200A ATS.
| Cummins QuietConnect RS17A 17kW | Cummins QuietConnect RS20AC 20kW with 200A ATS | |
|---|---|---|
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 17000 W | 20000 W |
| Running watts (propane) | 17000 W | 20000 W |
| Running watts (natural gas) | 17000 W | 18000 W |
| Noise level | 65 dBA | 65 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | No | Yes |
| Main-line circuit breaker | 100 A | 100 A |
| Start type | automatic | automatic |
| Engine | Cummins QSJ999G | Cummins QSJ999G |
| Engine displacement | 999 cc | 999 cc |
| NG use at half load | 165 ft³/h | 172 ft³/h |
| Propane use at half load | 1.73 gal/h | 1.81 gal/h |
| Weight | 531 lb | 596 lb |
| Warranty | 5 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Cummins QuietConnect RS17A 17kW or the Cummins QuietConnect RS20AC 20kW with 200A ATS?
The Cummins QuietConnect RS20AC 20kW with 200A ATS, at 20,000 running watts on its best fuel versus 17,000 W. Remember that dual-fuel and natural-gas ratings are lower than gasoline ratings — the comparison table shows the published per-fuel figures.
Which costs less to run, the Cummins QuietConnect RS17A 17kW or the Cummins QuietConnect RS20AC 20kW with 200A ATS?
Estimated fuel for 24 hours at about 50% load: $59 on natural gas for the Cummins QuietConnect RS17A 17kW vs $62 on natural gas for the Cummins QuietConnect RS20AC 20kW with 200A ATS, at national average prices. These are spec-sheet-derived estimates — the assumptions are on the methodology page, and different fuels make this a cost comparison, not an efficiency ranking.
Where do these specifications come from?
Every record on BackupAtlas is hand-curated from manufacturer documentation and spec sheets, and each generator page links to its source document.