Cummins Onan 12.5 RDJC Specs (Power | Fuel Consumption)

The Cummins Onan 12.5 RDJC generator is listed with standby output of 12 kW, Diesel (#1 or #2) fuel, 60 Hz operation, 4 available voltage configurations, and Three phase.

Cummins Onan Generator Specifications

Generator • Diesel (#1 or #2) • 60 Hz • Three phase

Standby power: 12 kWVoltage options: 4 configurationsDry weight: 939 lb (426 kg)

Key specifications

12 kW Standby power

Diesel (#1 or #2) Fuel

4 configurations Voltage options

Three phase Phase

939 lb (426 kg) Dry weight

60 Hz Frequency

Useful generator charts

Charts are shown only when this model has enough usable source data.

Power-to-weight

Standby output per 1,000 lb of dry weight versus similar-output Cummins Onan models.

This model

12.8 kW

Peer average

24.1 kW

42nd percentile

Model spec snapshot

Representative numeric specifications from this generator.

12 kWStandby

939.17 lbWeight

How the Cummins Onan 12.5 RDJC 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

12 kW

92% above avg

87th percentile

Dry weight

939 lb

36% above avg

88th percentile

Oil capacity

1.62 gal

107% above avg

95th percentile

Standby power12 kW

Low 1 kWAverage 6.2 kWHigh 14 kW

About 92% above the similar-output Cummins Onan average. Around the 87th percentile for this field.

Dry weight939 lb

Low 37 lbAverage 690 lbHigh 3,525 lb

About 36% above the similar-output Cummins Onan average. Around the 88th percentile for this field.

Oil capacity1.62 gal

Low 0.15 galAverage 0.78 galHigh 1.66 gal

About 107% above the similar-output Cummins Onan average. Around the 95th percentile for this field.

This model Peer average

Generator information

Manufacturer	Cummins Onan
Model	12.5 RDJC
Generator type	Generator
Fuel	Diesel (#1 or #2)
Frequency	60 Hz

Electrical output

Standby power	12 kW
Standby kVA	15.0
Voltage options	120/240 V, 120/208 V, 127/220 V, 139/240 V
Phase	Three phase
Power factor	0.8

Engine, cooling and controls

Engine model	Cummins/Onan Onan Diesel 4-cyl
Engine displacement	120 cu in (1.966 L)
Aspiration / cooling	Natural
Rated engine speed	1800 rpm
Engine oil capacity	1.51 gal (5.7 L)
Engine coolant capacity	3 gal (11.4 L)
Oil capacity	1.62 gal (6.2 L)
Coolant capacity	3 gal (11.4 L)
Alternator	Cummins/Onan Revolving Field, 4-pole, Brushless Exciter (4-pole)

Physical specifications

Dry weight	939 lb (426 kg)
Dimensions (L × W × H)	56.6 × 27 × 40.1 in (1438 × 686 × 1019 mm)

Battery

Battery group	2 (6V in series) / Group 5D
Battery cranking	560 CCA
Battery voltage	12 V
Battery quantity	2

Fuel consumption

Prime	1.3 gal/h (4.92 L/h) @ 100%

Maintenance and service parts

Oil filter	Specification: Full Flow Type

Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.