Cummins QuietConnect RS20A 20kW
Cummins QuietConnect RS20A 20kW is a home standby generator from Cummins, rated 20,000 running watts on propane and 18,000 W on natural gas, measured at 65 dBA, with 120/240V output.
| Type | home-standby |
|---|---|
| Fuel | natural-gas, propane |
| Running watts (gas / LP for standby) | 20000 W |
|---|---|
| Running watts (propane) | 20000 W |
| Running watts (natural gas) | 18000 W |
| Noise level | 65 dBA |
|---|---|
| NG use at half load | 172 ft³/h |
| Propane use at half load | 1.81 gal/h |
| Output voltage | 120/240V |
|---|---|
| Automatic transfer switch included | No |
| Main-line circuit breaker | 100 A |
| Start type | automatic |
|---|
| Engine | Cummins QSJ999G |
|---|---|
| Engine displacement | 999 cc |
| Weight | 531 lb |
|---|
| Warranty | 5 yr |
|---|
What the numbers mean
- At 20,000 running watts on its best fuel, this unit is sized for whole-house coverage on a typical 200 A home, subject to a load calculation by a licensed electrician.
- Runs on natural gas, propane — expect lower output on propane (roughly 10%) and natural gas (roughly 20%) than on gasoline; the spec table shows the published per-fuel ratings.
- Estimated fuel cost for 24 h at ~50% load: about $62 on natural gas at national average prices (assumptions).
- Permanently installed unit: sizing, gas-line capacity, placement clearances, and the transfer switch are a job for licensed installers under local permits.
Compare the Cummins QuietConnect RS20A 20kW
- Cummins QuietConnect RS20A 20kW vs Briggs & Stratton PowerProtect DX 20kW (040657)
- Cummins QuietConnect RS20A 20kW vs Briggs & Stratton PowerProtect DX 26kW (040806)
- Cummins QuietConnect RS20A 20kW vs Champion aXis 14kW with 200A ATS (100837)
- Cummins QuietConnect RS20A 20kW vs Generac Guardian 14kW (7224)
- Cummins QuietConnect RS20A 20kW vs Generac Guardian 18kW (7226)
- Cummins QuietConnect RS20A 20kW vs Generac Guardian 20kW (7039)
- Cummins QuietConnect RS20A 20kW vs Generac Guardian 22kW (7042)
- Cummins QuietConnect RS20A 20kW vs Generac Guardian 22kW with 200A ATS (7043)
Similar generators
- Briggs & Stratton PowerProtect DX 20kW (040657) ( 20,000 W running)
- Cummins QuietConnect RS20AC 20kW with 200A ATS ( 20,000 W running)
- Generac Guardian 20kW (7039) ( 20,000 W running)
- Kohler 20RCA 20kW ( 20,000 W running)
- Kohler 20RCAL 20kW with ATS ( 20,000 W running)
- Generac Guardian 18kW (7226) ( 18,000 W running)
Frequently asked questions
What can the Cummins QuietConnect RS20A 20kW run during an outage?
With 20,000 running watts on its best fuel, the Cummins QuietConnect RS20A 20kW is sized for whole-house coverage on a typical 200 A home, subject to a load calculation by a licensed electrician. Add up your actual loads with a sizing worksheet — the bands here are rough guidance, not a load calculation.
What does the Cummins QuietConnect RS20A 20kW cost to run for a day?
Roughly $62 for 24 hours of continuous operation at about 50% load on natural gas, at national average fuel prices. The assumptions behind this estimate are documented on the methodology page; your fuel price and load change the figure.
Does the Cummins QuietConnect RS20A 20kW start automatically?
Yes — home standby generators monitor utility power and start themselves when it fails; pairing it with an appropriately sized automatic transfer switch (sold separately for some configurations) completes the automatic changeover.
Sources
- mart.cummins.com (retrieved 2026-07-23)