Cummins Quiet Connect RS20AC 20kW
#6 in 15 to 22 kWFull review
For homes with central air that want a quiet 20 kW unit with monitoring included and a service-entrance switch in the box.
Norwall $6,662.42$6,662.42
The Cummins Quiet Connect RS20AC 20kW is the better standby generator overall, rated 3.2 to 3.0. The Cummins Quiet Connect RS20AC 20kW leads on value. The Cummins Quiet Connect RS17A 17kW costs $397.45 less ($6,264.97 vs $6,662.42).
Cummins Quiet Connect RS17A 17kW
#8 in 15 to 22 kWFull review
For average homes on natural gas that want full rated output and built-in monitoring from a commercial power brand.
Norwall $6,264.97$6,264.97
Prices were last checked November 1, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Cummins Quiet Connect RS20AC 20kW for value ($333 per kW ($6,662 with transfer switch, 20 kW on propane) vs $369 per kW ($6,265 with transfer switch, 17 kW on propane)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 15 to 22 kw standby generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Cummins Quiet Connect RS20AC 20kW | Cummins Quiet Connect RS17A 17kW |
|---|---|---|
| Overall rating | 3.2/5 | 3.0/5 |
| Value 35% | 28 $333 per kW ($6,662 with transfer switch, 20 kW on propane) | 13 $369 per kW ($6,265 with transfer switch, 17 kW on propane) |
| Transfer switch 15% | 100 includes a 200 A transfer switch | 100 includes a 200 A transfer switch |
| Noise 15% | 58 65 dBA rated in normal operation | 58 65 dBA rated in normal operation |
| Power quality 10% | 83 under 5% THD | 83 under 5% THD |
| Warranty 25% | 29 5-year warranty | 29 5-year warranty |
Specifications
| Cummins Quiet Connect RS20AC 20kW | Cummins Quiet Connect RS17A 17kW | |
|---|---|---|
| Output | ||
| Rated output, propane | 20 kW | 17 kW |
| Rated output, natural gas | 18 kW | 17 kW |
| THD | Under 5% | Under 5% |
| Engine | 999 cc | 999 cc |
| Engine speed | 3,600 rpm | 3,600 rpm |
| Install | ||
| Transfer switch | Included, 200 A | Included, 200 A |
| Load management | No | No |
| Remote monitoring | Yes | Yes |
| Enclosure | Aluminum | Aluminum |
| Dimensions | 34.1 x 36.0 x 27.3 in | 34.1 x 36.0 x 27.3 in |
| Weight | 596 lb | 531 lb |
| Noise and warranty | ||
| Noise, normal operation | 65 dBA | 65 dBA |
| Warranty | 5 years | 5 years |