Champion aXis 14kW with 200A ATS (100837) 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 14,000 — about 30% more capacity for the Cummins QuietConnect RS20AC 20kW with 200A ATS. The Champion aXis 14kW with 200A ATS (100837) is the quieter of the two (62 dBA vs 65 dBA — though manufacturers measure noise at different loads and distances). Warranty favors the Champion aXis 14kW with 200A ATS (100837): 10 years vs 5.
| Champion aXis 14kW with 200A ATS (100837) | 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) | 14000 W | 20000 W |
| Running watts (propane) | 14000 W | 20000 W |
| Running watts (natural gas) | 12500 W | 18000 W |
| Noise level | 62 dBA | 65 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | Yes | Yes |
| Main-line circuit breaker | 65 A | 100 A |
| Start type | automatic | automatic |
| Engine | Champion Milwaukee Series V-Twin | Cummins QSJ999G |
| Engine displacement | 754 cc | 999 cc |
| NG use at half load | — | 172 ft³/h |
| Propane use at half load | — | 1.81 gal/h |
| Weight | — | 596 lb |
| Warranty | 10 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Champion aXis 14kW with 200A ATS (100837) 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 14,000 W. Remember that dual-fuel and natural-gas ratings are lower than gasoline ratings — the comparison table shows the published per-fuel figures.
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.