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WhisperWatt DCA125USI Diesel generator


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Prime Rating — 100 kW (125 kVA)
Standby Rating — 110 kW (137 kVA)
60 Hertz

WhisperWatt DCA125SSI drawing



Performance Data
Prime Rating 100 kW 125 kVA
Standby Rating 110 kW 137 kVA
Generator RPM 1800
Voltage - Three Phase 208, 220, 240, 416, 440, 460, 480V Switchable
Voltage - Single Phase 120, 127, 139, 240, 254, 277V Switchable
Generator Design Revolving field, Self-ventilated, Drip-proof, Single bearing
Voltage Regulation (No Load to Full Load) ±0.5 %
Power Factor 0.8
Armature Connection Star with Neutral/ Zig Zag
Excitation Brushless with AVR
No. Poles 4-pole
Frequency 60 Hz
Frequency Regulation (steady state load) ±0.25 %
Sound Level (Full Load at 23 ft.) 65 dB(A)
Notice: Features and equipment specifications are subject to change without notice.


WhisperWatt DCA125SSI drawing


Standard Features:


Optional Generator Features:


Optional Control Features:


Optional Fuel Cell Features:


Generator Specifications
Design Revolving field, self ventilated, drip-proof, single bearing
Number of Poles 4
Excitation Brushless with AVR
Standby Output 110 KW (137 KVA)
Prime Output 100 KW (125 KVA)
Generator RPM 1800
Voltage - 3Ø 208, 220, 240, 416, 440, 480V Switchable
Voltage - 1Ø 120, 127, 139, 240, 254, 277V Switchable
Armature Connection Star with neutral / Zig Zag
Voltage Regulation ±0.5%
Power Factor 0.8
Frequency 60 Hz

Frequency Regulation:

No Load to Full Load

Isochronous under varying load from
no load to 100% load

Frequency Regulation:

Steady State

±0.25% of mean value for constant loads from no load to full load.
Insulation Class F
Sound Level dB(A) 65


Engine Specifications
Make Isuzu
Model 4HK1X
Emissions EPA Tier 3 Certified
Starting system Electric
Design 4-cycle, water cooled, Direct injection, Turbocharged, air-to-air intercooled
Displacement 5,193cc
No. cylinders 4
Bore 115 mm
Stroke 125 mm
Gross Engine Power Output 170.3 hp (93.9kW)
BMEP 212 psi (1458 kPa)
Piston Speed 1480 ft./min.
Compression Ratio 17.5:1
Engine Speed 1800 rpm
Overspeed Limit 2100 rpm
Oil Capacity 6.1 gal (23 L)
Battery 12V 128Ah x 1


Fuel System
Fuel Tank Capacity 169 gal (640 L)
Diesel Fuel at % of Load gal/hr (L/hr)
100% 7.3 (27.6)
75% 5.7 (21.7)
50% 4.0 (15.1)
25% 2.4 (9.1)


Rated Voltage Max Amps
1Ø 120V 277.8 (4 wire) 300x2 (Zigzag)
1Ø 240V 138.9 (4 wire) 300 (Zigzag)
3Ø 240V 300 Amps
3Ø 480V 150 Amps
Main Line Circuit Breaker Rating 300 Amps
Over Current Releay Trip Set Point 152 Amps



12 months from date of purchase with unlimited hours or 24 months
from date of purchase with 2000 hours (whichever comes fi rst).
24 months from date of purchase or 2000 hours (whichever occurs fi rst).
12 months excluding normal wear items.



Generator is not intended for use in enclosed areas or where free flow of air is restricted.

Backfeed to a utility system can cause electrocution and/or property damage. Do not connect to any building’s electrical system except through an approved device.
Specifications are subject to change without notice.



WhisperWatt DCA125USI Spec Sheet


DCA125USI Operators manual