Cummins QuietConnect RS30 30kW Liquid-Cooled
Cummins QuietConnect RS30 30kW Liquid-Cooled is a home standby generator from Cummins, rated 30,000 running watts on propane and 30,000 W on natural gas, measured at 60 dBA, with 120/240V output.
| Type | home-standby |
|---|---|
| Fuel | natural-gas, propane |
| Running watts (gas / LP for standby) | 30000 W |
|---|---|
| Running watts (propane) | 30000 W |
| Running watts (natural gas) | 30000 W |
| Noise level | 60 dBA |
|---|---|
| NG use at half load | 219 ft³/h |
| Propane use at half load | 2.7 gal/h |
| Output voltage | 120/240V |
|---|---|
| Automatic transfer switch included | No |
| Main-line circuit breaker | 150 A |
| Start type | automatic |
|---|
| Engine displacement | 2400 cc |
|---|
| Weight | 1231 lb |
|---|
| Warranty | 2 yr |
|---|
What the numbers mean
- At 30,000 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 $79 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 RS30 30kW Liquid-Cooled
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Briggs & Stratton PowerProtect DX 20kW (040657)
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Briggs & Stratton PowerProtect DX 26kW (040806)
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Generac Guardian 20kW (7039)
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Generac Guardian 22kW (7042)
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Generac Guardian 22kW with 200A ATS (7043)
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Generac Guardian 24kW (7209)
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Generac Guardian 24kW with 200A ATS (7210)
- Cummins QuietConnect RS30 30kW Liquid-Cooled vs Generac Guardian 26kW (7290)
Similar generators
- Briggs & Stratton PowerProtect DX 26kW (040806) ( 26,000 W running)
- Generac Guardian 26kW (7290) ( 26,000 W running)
- Generac Guardian 26kW with 200A ATS (7291) ( 26,000 W running)
- Kohler 26RCA 26kW ( 26,000 W running)
- Kohler 26RCAL 26kW with ATS ( 26,000 W running)
- Cummins QuietConnect RS25 25kW Liquid-Cooled ( 25,000 W running)
Frequently asked questions
What can the Cummins QuietConnect RS30 30kW Liquid-Cooled run during an outage?
With 30,000 running watts on its best fuel, the Cummins QuietConnect RS30 30kW Liquid-Cooled 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 RS30 30kW Liquid-Cooled cost to run for a day?
Roughly $79 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 RS30 30kW Liquid-Cooled 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
- norwall.com (retrieved 2026-07-23)
- mart.cummins.com (retrieved 2026-07-24)