Specifications
| Fuel | Natural gas/propane |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 20 kW |
| Prime power | 20 kW |
| Controller | Proprietary electronic |
| Alternator | Cummins/Onan 2-pole self-excited revolving field |
| Voltage options | 120/240 V |
| Phase | 3 |
| Circuit breaker | 100 A |
| Battery group | Group 51R |
| Battery cranking | 450 CCA |
| Max ambient | -40 °C |
| Dimensions (L×W×H) | 1339×1037×889 mm |
| Dry weight | 245 kg |
| Sound level | 62.0 dBA @ 7 m |
Filters & service parts
model family| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Large-capacity air cleaner | — | find | ||
| Fuel filter | — | find | |||
| Oil filter | Spin-on oil filter | — | find | ||
| Belt | — | find | |||
| Coolant | — | ||||
| Oil | Cummins Proprietary electronic control with self-diagnostics and generator set protection and safety features included | — | 2000 hr |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.
Common questions
What is the power rating of the Cummins/Onan RS20A?
The Cummins/Onan RS20A is rated 20 kW standby.
What engine does the Cummins/Onan RS20A use?
The Cummins/Onan RS20A is powered by the Cummins/Onan QSJ999G engine.
What fuel does the Cummins/Onan RS20A use?
The Cummins/Onan RS20A runs on Natural gas/propane.
What alternator does the Cummins/Onan RS20A use?
The Cummins/Onan RS20A uses a Cummins/Onan 2-pole self-excited revolving field alternator.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 0% | 1.6 | |
| Prime | 0% | 2.1 | |
| Prime | 0% | 2.7 | |
| Prime | 1% | 3.4 | |
| Standby | 0% | 3.9 | |
| Standby | 0% | 4.8 | |
| Standby | 0% | 5.6 | |
| Standby | 1% | 6.9 |
Available documents
Spec sheet — 0058055 (Cummins/Onan)Spec sheet — NAS-6254-EN 0 (Cummins/Onan)Spec sheet — a-1555 (Cummins/Onan)