The Cummins Onan 20QSA4 generator is listed with standby output of 20 kW, diesel fuel, 60 Hz operation, and 12 V output.
Cummins Onan Generator Specifications
Generator • diesel • 60 Hz
Standby power: 20 kWVoltage options: 12 V
Key specifications
20 kW Standby power
diesel Fuel
12 V Voltage options
60 Hz Frequency
How the Cummins Onan 20QSA4 compares
This compares the supplied numeric specification with Cummins Onan generators in the same broad standby-power class where enough comparable data exists.
Standby power
20 kW
3% below avg
47th percentile
Oil capacity
2.25 gal
27% above avg
76th percentile
Standby power20 kW
Low 15 kWAverage 20.7 kWHigh 26.8 kW
About 3% below the similar-output Cummins Onan average. Around the 47th percentile for this field.
Oil capacity2.25 gal
Low 0.61 galAverage 1.76 galHigh 3.12 gal
About 27% above the similar-output Cummins Onan average. Around the 76th percentile for this field.
This model Peer average
Generator information
| Manufacturer | Cummins Onan |
|---|---|
| Model | 20QSA4 |
| Generator type | Generator |
| Fuel | diesel |
| Frequency | 60 Hz |
Electrical output
| Standby power | 20 kW |
|---|---|
| Voltage options | 12 V |
Engine, cooling and controls
| Engine model | Cummins/Onan 4A2.3 |
|---|---|
| Rated engine speed | 1800 rpm |
| Engine oil capacity | 2.25 gal (8.5 L) |
| Engine coolant capacity | 4.44 gal (16.8 L) |
| Oil capacity | 2.25 gal (8.5 L) |
Battery
| Battery voltage | 12 V |
|---|
Maintenance and service parts
| Engine oil | Interval: 250 hr |
|---|---|
| Oil filter | Part number: 51592; Interval: 200 hr; Specification: Change Fuel Filter |
| Fuel filter | Interval: 1000 hr |
| Air filter | Interval: 500 hr |
| Coolant | Interval: 1000 hr; Specification: Change coolant every 1, 000 hours or as needed. |
| Belt | Interval: 200 hr |
Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.