The Cummins Onan RS20A generator is listed with standby output of 20 kW, Natural gas/propane fuel, 60 Hz operation, 120/240 V output, Three phase, and sound level of 62 dBA @ 23 ft (7 m).
Generator • Natural gas/propane • 60 Hz • Three phase
Key specifications
Useful generator charts
Charts are shown only when this model has enough usable source data.
37 kW
19.2 kW
20 kW
20 kW
How the Cummins Onan RS20A compares
This compares the supplied numeric specification with Cummins Onan generators in the same broad standby-power class where enough comparable data exists.
About 3% below the similar-output Cummins Onan average. Around the 47th percentile for this field.
About 58% below the similar-output Cummins Onan average. Around the 12th percentile for this field.
Generator information
| Manufacturer | Cummins Onan |
|---|---|
| Model | RS20A |
| Generator type | Generator |
| Fuel | Natural gas/propane |
| Frequency | 60 Hz |
Electrical output
| Standby power | 20 kW |
|---|---|
| Prime power | 20 kW |
| Voltage options | 120/240 V |
| Phase | Three phase |
| Circuit breaker | 100 A |
Engine, cooling and controls
| Engine model | Cummins/Onan QSJ999G |
|---|---|
| Engine displacement | 61 cu in (0.999 L) |
| Aspiration / cooling | Naturally aspirated |
| Rated engine speed | 3600 rpm |
| Maximum ambient | -40 °F (-40 °C) |
| Controller | Proprietary electronic |
| Alternator | Cummins/Onan 2-pole self-excited revolving field |
Physical specifications
| Dry weight | 540 lb (245 kg) |
|---|---|
| Dimensions (L × W × H) | 52.7 × 40.8 × 35 in (1339 × 1037 × 889 mm) |
| Sound level | 62 dBA @ 23 ft (7 m) |
Battery
| Battery group | Group 51R |
|---|---|
| Battery cranking | 450 CCA |
Fuel consumption
| Standby | 3.9 gal/h @ 0%; 4.8 gal/h @ 1%; 5.6 gal/h; 6.9 gal/h |
|---|---|
| Prime | 1.6 gal/h @ 0%; 2.1 gal/h @ 1%; 2.7 gal/h; 3.4 gal/h |
Maintenance and service parts
| Engine oil | Interval: 2000 hr; Specification: Cummins Proprietary electronic control with self-diagnostics and generator set protection and safety features included |
|---|---|
| Oil filter | Specification: Spin-on oil filter |
| Air filter | Specification: Large-capacity air cleaner |
Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.