The Cummins Onan 28DGBB generator is listed with standby output of 28 kW, gasoline fuel, 50 Hz operation, 12 V output, and 1 or 3.
Cummins Onan Generator Specifications
Generator • gasoline • 50 Hz • 1 or 3
Standby power: 28 kWVoltage options: 12 V
Key specifications
28 kW Standby power
gasoline Fuel
12 V Voltage options
1 or 3 Phase
50 Hz Frequency
How the Cummins Onan 28DGBB 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
28 kW
35% above avg
98th percentile
Oil capacity
3.04 gal
72% above avg
93rd percentile
Standby power28 kW
Low 15 kWAverage 20.7 kWHigh 26.8 kW
About 35% above the similar-output Cummins Onan average. Around the 98th percentile for this field.
Oil capacity3.04 gal
Low 0.61 galAverage 1.76 galHigh 3.12 gal
About 72% above the similar-output Cummins Onan average. Around the 93rd percentile for this field.
This model Peer average
Generator information
| Manufacturer | Cummins Onan |
|---|---|
| Model | 28DGBB |
| Generator type | Generator |
| Fuel | gasoline |
| Frequency | 50 Hz |
Electrical output
| Standby power | 28 kW |
|---|---|
| Voltage options | 12 V |
| Phase | 1 or 3 |
Engine, cooling and controls
| Engine model | Cummins/Onan 4B3.9 G* |
|---|---|
| Engine displacement | 239 cu in (3.92 L) |
| Aspiration / cooling | naturally aspirated |
| Rated engine speed | 1800 rpm |
| Engine oil capacity | 3.04 gal (11.5 L) |
| Engine coolant capacity | 5.55 gal (21 L) |
| Oil capacity | 3.04 gal (11.5 L) |
| Controller | Detector, PowerCommand 3100, Sentinel |
Battery
| Battery voltage | 12 V |
|---|---|
| Battery quantity | 1 |
Maintenance and service parts
| Engine oil | Specification: Change the oil and filter at the intervals recommended in the Maintenance Table. |
|---|---|
| Oil filter | Specification: Apply a light coat of oil to the gasket sealing surface of the new filter and fill filter with clean, new oil. Install filter and tighten 2/3 turn by hand after the seal touches the sealing surface of the bracket. |
| Air filter | Interval: 250 hr; Specification: Check Air Cleaner (clean if required) every 250 hours. |
| Belt | Interval: 250 hr; Specification: Check Drive Belt Tension every 250 hours. |
Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.