Cummins QuietConnect RS20A 20kW vs Kohler 14RCA 14kW
The Cummins QuietConnect RS20A 20kW is the more powerful unit: 20,000 running watts against 14,000 — about 30% more capacity for the Cummins QuietConnect RS20A 20kW. The Cummins QuietConnect RS20A 20kW is the quieter of the two (65 dBA vs 67 dBA — though manufacturers measure noise at different loads and distances).
| Cummins QuietConnect RS20A 20kW | Kohler 14RCA 14kW | |
|---|---|---|
| Price (MSRP) | — | $4,997 |
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 20000 W | 14000 W |
| Running watts (propane) | 20000 W | 14000 W |
| Running watts (natural gas) | 18000 W | 12000 W |
| Noise level | 65 dBA | 67 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | No | No |
| Main-line circuit breaker | 100 A | — |
| Start type | automatic | automatic |
| Engine | Cummins QSJ999G | Kohler CH740 |
| Engine displacement | 999 cc | 725 cc |
| NG use at half load | 172 ft³/h | 124 ft³/h |
| Propane use at half load | 1.81 gal/h | 1.65 gal/h |
| Weight | 531 lb | 440 lb |
| Warranty | 5 yr | 5 yr |
Frequently asked questions
Which is more powerful, the Cummins QuietConnect RS20A 20kW or the Kohler 14RCA 14kW?
The Cummins QuietConnect RS20A 20kW, 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.
Which costs less to run, the Cummins QuietConnect RS20A 20kW or the Kohler 14RCA 14kW?
Estimated fuel for 24 hours at about 50% load: $62 on natural gas for the Cummins QuietConnect RS20A 20kW vs $44 on natural gas for the Kohler 14RCA 14kW, 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.