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Caterpillar C15 ATAAC Specs (Power | Consumption)

Written by Ernie Lo in Specs Last Updated August 18, 2026

The Caterpillar C15 ATAAC generator is listed with standby output of 500 kW, Diesel fuel, 60 Hz operation, 480 V output, and Three phase.

Caterpillar Generator Specifications

Generator • Diesel • 60 Hz • Three phase

Standby power: 500 kWVoltage options: 480 VDry weight: 8,287 lb (3,759 kg)

Key specifications

500 kW Standby power
Diesel Fuel
480 V Voltage options
Three phase Phase
8,287 lb (3,759 kg) Dry weight
60 Hz Frequency

Useful generator charts

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

Fuel consumption by load
How fuel use changes as generator load increases.
50% load

20.5 gal/hr

75% load

28.6 gal/hr

100% load

35.9 gal/hr

Estimated runtime by load
Calculated from the listed 17.1 gal fuel capacity and fuel-consumption data.
50% load

0.8 hr

75% load

0.6 hr

100% load

0.5 hr

Power-to-weight
Standby output per 1,000 lb of dry weight compared with a fixed industry reference for this output class.
This model

60.3 kW

Typical reference

47 kW

Typical for this output class
Power output
Low 328 kW High 500 kW
Standby

500 kW

Prime

328 kW

How the Caterpillar C15 ATAAC compares

Low, Typical and High are fixed generator-industry reference bands set by standby-output class. They do not change based on the models contained in this CSV.

Standby power
500 kW
Low range
Typical: 700 kW
Dry weight
8,287 lb
Low range
Typical: 14,991 lb
Oil capacity
15.85 gal
Low range
Typical: 23.78 gal
Standby power500 kW · Low
Low 400 kWTypical 700 kWHigh 1,000 kW

Falls toward the low end of the fixed industry reference range for generators in this standby-output class.

Dry weight8,287 lb · Low
Low 7,011 lbTypical 14,991 lbHigh 27,999 lb

Falls toward the low end of the fixed industry reference range for generators in this standby-output class.

Oil capacity15.85 gal · Low
Low 10.57 galTypical 23.78 galHigh 59.44 gal

Falls toward the low end of the fixed industry reference range for generators in this standby-output class.

This model Typical industry reference

Generator information

Manufacturer Caterpillar
Model C15 ATAAC
Generator type Generator
Fuel Diesel
Frequency 60 Hz

Electrical output

Standby power 500 kW
Prime power 328 kW
Standby kVA 625.0
Voltage options 480 V
Phase Three phase
Power factor 0.8
Circuit breaker 100 A

Engine, cooling and controls

Engine model Caterpillar C15 ATAAC
Engine displacement 928 cu in (15.2 L)
Aspiration / cooling ATAAC
Rated engine speed 1800 rpm
Engine oil capacity 15.9 gal (60 L)
Engine coolant capacity 12.6 gal (47.8 L)
Oil capacity 15.9 gal (60 L)
Coolant capacity 18 gal (68 L)
Maximum ambient 124 °F (51 °C)
Controller EMCP 4.1, EMCP 4.2
Alternator Caterpillar 6124F (4-pole, Class H insulation)
Emissions EPA Tier 4 Interim

Physical specifications

Dry weight 8, 287 lb (3, 759 kg)
Dimensions (L × W × H) 168.2 × 81 × 82.4 in (4273 × 2058 × 2092 mm)

Fuel system and runtime

Fuel tank 17.1 gal (64.7 L)
Tank runtime 86 hr

Fuel consumption

Standby 20.5 gal/h (78.0 L/h) @ 50%; 28.6 gal/h (108.0 L/h) @ 75%; 35.9 gal/h (136.6 L/h) @ 100%
Prime 27.5 gal/h (103.2 L/h)

Maintenance and service parts

Engine oil Interval: 500 hr; Capacity: 74.0 L
Oil filter Part number: 2P4005; Interval: 1250 hr
Fuel filter Part number: 33674; Interval: 1250 hr
Air filter Part number: 46822; Interval: 1250 hr
Coolant Interval: 1250 hr; Capacity: 57.8
Belt Interval: 1250 hr

Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Caterpillar USA website.

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Ernie Lo

Ernie Lo is a qualified web designer and web developer. He works as an IT support technician and website manager at Benleigh Vending, and he also fixes vending machines.

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