QT048
Standby Power Rating
48 kW 60 Hz
Liquid Cooled Gas Engine Generator Sets
GENERAC 4.2L ENGINE
Naturally Aspirated
Gaseous Fueled
STANDARD EQUIPMENT
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Mainline circuit breaker
Radiator drain extension
Battery charge alternator
2 Amp static battery charger
Battery cables
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All input connections in one single area
High coolant temperature shutdown
Low oil pressure shutdown
Low coolant level automatic shutdown
Overspeed automatic shutdown
Crank timer
Exercise timer
Oil drain extension
Cool flow radiator
Battery rack
Fan and belt guards
Isochronous governor
Flex fuel line
Hour meter
Closed coolant recovery system
UV/Ozone resistant hoses
Watertight state of the art electrical connectors
FEATURES
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State of the art digital control system with R100 digital
control panel
Watertight electrical connectors
Rodent proof construction
High efficiency, low distortion Generac designed
alternator
Vibration isolated from mounting base
Matching Generac transfer switches engineered and
tested to work as a system
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Innovative design and fully prototype tested
UL2200 Listed
Solid state frequency compensated
voltage regulator
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Dynamic and static battery charger
Sound attenuated acoustically designed enclosure
Quiet test for low noise level exercise
Acoustically designed engine cooling system
High flow low noise factory engineered exhaust system
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All components easily accessible for maintenance
Electrostatically applied powder paint
QT048
OPERATING DATA
QT048
kW RATING
48
ENGINE SIZE
4.2 Liter V6
GENERATOR OUTPUT VOLTAGE/KW - 60Hz
120/208V, 3-phase, 0.8 pf
120/240V, 3-phase, 0.8 pf
kW - LP
48
Amps
166
144
72
kW - NG
Amps
160
138
69
CB Size
175
150
46
46
46
48
48
277/480V, 3-phase, 0.8 pf
80
GENERATOR LOCKED ROTOR KVA
AVAILABLE @ VOLTAGE DIP OF 35%
Single phase or 208 3-phase
100
110
480V 3-phase
ENGINE FUEL CONSUMPTION (Natural Gas) (Propane)
Natural Gas
Propane
(ft3/hr.)
88
(gal/hr.)
0.94
2.23
4.03
5.62
cu ft/hr
34.4
81
147
204
Exercise cycle
25% of rated load
50% of rated load
75% of rated load
100% of rated load
205
370
516
661
7.20
261
ENGINE COOLING
Air flow (inlet air including alternator and combustion air)
System coolant capacity
Heat rejection to coolant
Max. operating air temp. on radiator
Max. ambient temperature
ft3/min.
2,460
3.0
165,000
60 (150)
50 (140)
US gal.
BTU/hr.
°C (°F)
°C (°F)
COMBUSTION AIR REQUIREMENTS
Flow at rated power 60 Hz
cfm
235
SOUND EMISSIONS IN DBA
Exercising at 7 meters
Normal operation at 7 meters
60
65
EXHAUST
Exhaust flow at rated output 60 Hz
Exhaust temp. at muffler outlet
cfm
°F
395
1100
ENGINE PARAMETERS
Rated synchronous RPM
HP at rated KW
60 Hz
60 Hz
1800
75
POWER ADJUSTMENT FOR AMBIENT CONDITIONS
Temperature Deration
3% for every 10 °C above - °C
1.65% for every 10 °F above - °F
Altitude Deration
25
77
1% for every 100 m above - m
3% for every 1000 ft. above - ft.
183
600
RATING: All three phase units are rated at 0.8 power factor. All single phase units are rated at 1.0 power factor. STANDBY RATING: Standby ratings
apply to installations served by a reliable utility source. The standby rating is applicable to varying loads for the duration of a power outage. There is
no overload capability for this rating. Ratings are in accordance with ISO-3046-1, BS5514, and DIN6271. Maximum wattage and current are subject
to and limited by such factors as fuel Btu content, ambient temperature, altitude, engine power and condition. Design and specifications are subject
to change without notice.
KW rating is based on LPG Fuel and may derate with natural gas.
INTERCONNECTIONS
QT048
48/46 240 1Ø
48/46 208 3Ø
48/46 240 3Ø
48/46 480 3Ø
200
175
150
80
#6 to 300 mcm
#6 to 300 mcm
#6 to 300 mcm
#6 to 300 mcm
Installation Drawing Ref. No. 0G5868
INSTALLATION LAYOUT
WEIGHT: 1740 lbs.
Generac Power Systems, Inc. • P.O. Box 8, Waukesha, WI 53187 • generac.com
©2008 Generac Power Systems, Inc. All rights reserved. All specifications are subject to change without notice. Bulletin 0179270SBY/Printed in U.S.A. 09.08
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