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WhisperWatt DCA25USI Diesel generator


Call for guaranteed low pricing and quantity discounts!


Prime Rating: 20 kW (25 kVA)
Standby Rating: 22 kW (27.5 kVA)
60 Hertz

WhisperWatt DCA25SSI drawing



Performance Data
Prime Rating 20 kW 25 kVA
Standby Rating 22 kW 27.5 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) ±3-5 %
Sound Level (Full Load at 23 ft.) 59 dB(A)
Notice: Features and equipment specifications are subject to change without notice.


WhisperWatt DCA25SSI drawing


Standard Features:


Optional Generator Features:


Optional Control Features:


Ultra-Silent Features:


Generator Specifications
Design Revolving field, self-ventilated, drip-proof, single bearing
Armature Connection Star w/ Neutral Zig Zag
Phase 3 Single
Standby Output 22 KW (27.5 KVA) 15.3 KW
Prime Output 20 KW (25 KVA) 14.4 KW
3Ø Voltage Voltage Selector Switch at 3Ø 240/139 208Y/120, 220Y/127, 240Y/139 N/A
3Ø Voltage Voltage Selector Switch at 3Ø 480/277 416Y/240, 440Y/254,
1Ø Voltage Voltage Selector Switch at 1Ø 240/120 N/A 240/120
Power Factor 0.8 1.0
Voltage Regulation ±0.5%
Generator RPM 1800
Frequency 60 Hz
No. of Poles 4
Excitation Brushless with AVR

Frequency Regulation:

No load to full load

3~5% under varying loads from no load
to 100% rated load

Frequency Regulation:

Steady State

±0.5% of mean value for constant loads
from no load to full load.
Insulation Class F
Sound Level dB(A) 59


Engine Specifications
Make Isuzu
Model BV-4LE2
Emissions EPA Tier 4 Certified
Starting system Electric
Design 4-cycle, water cooled, Direct injection
Displacement 2,179cc
No. cylinders 4
Bore 85 mm
Stroke 96 mm
Gross Engine Power Output 35.9 hp (25.5kW)
BMEP 100 psi (691 kPa)
Piston Speed 1134 ft./min.
Compression Ratio 18:1
Engine Speed 1800 rpm
Overspeed Limit 2100 rpm
Oil Capacity 2.25 gal (8.5 L)
Battery 12V 53Ah x 1


Fuel System
Fuel Tank Capacity 41.7 gal (158 L)
Diesel Fuel at % of Load gal/hr (L/hr)
100% 1.66 (6.3)
75% 1.21 (4.6)
50% 0.85 3.2)
25% 0.58 (2.2)


Rated Voltage Max Amps
1Ø 120V 55.6 (4 wire) 60A x 2 (Zigzag)
1Ø 240V 27.8 (4 wire) 60A (Zigzag)
3Ø 240V 60 Amps
3Ø 480V 30 Amps
Main Line Circuit Breaker Rating 60 Amps
Over Current Releay Trip Set Point 30 Amps



Isuzu Engine:
12 months from date of purchase with unlimited hours or 24 months
from date of purchase with 2000 hours (whichever occurs first).
24 months from date of purchase or 2000 hours (whichever occurs
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 DCA25USI Spec Sheet


DCA25USI operators manual