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Standby Power Rating 45 kW 60 Hz 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
Closed coolant recovery system
UV/Ozone resistant hoses
Watertight state of the art electrical connectors
Mainline
circuit
breaker
Radiator drain extension
Battery charge alternator
2 Amp static battery charger
Battery rack and battery cables
Fan and belt guards
Isochronous
governor
Flex fuel line pigtail
STANDARD EQUIPMENT
Innovative design and fully prototype tested
UL
2200
Listed
Solid state frequency compensated voltage regulator
Dynamic and static battery charger
Sound attenuated acoustically designed enclosure

Whisper-Test
for low noise level exercise
High flow low noise factory engineered exhaust system

State of the art digital control system with R-Series digital
control panel
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
All components easily accessible for maintenance
Electrostatically applied textured powder paint
Acoustically designed engine cooling system
FEATURES

Model Number: 5261 (Steel - Tan)
GENERAC 2.4L ENGINE
Naturally Aspirated
Gaseous Fueled
Whisper-Test
Low Speed Exercise
61 dB(A) at 23 feet
UL 2200 Listed
Transfer Switch is sold separately
Standby Power Rating
45 kW 60 Hz
Liquid Cooled
Gas Engine
Generator Sets APPLICATION
& ENGINEERING DATA
Rating definitions - Standby: Applicable for supplying emergency power for the duration of the utility power outage. No overload capability is available for this rating. (All ratings in accordance with
BS5514, ISO3046 and DIN6271). (All ratings in accordance with BS5514, ISO3046, ISO8528 and DIN6271).
STANDBY 45 kW
GENERATOR SPECIFICATIONS
TYPE ...........................................................................................................Synchronous
ROTOR INSULATION .......................................................................................... Class H
STATOR INSULATION ......................................................................................... Class H
TOTAL HARMONIC DISTORTION ........................................................................... <5%
TELEPHONE INTERFERENCE FACTOR (TIF) ........................................................<50
ALTERNATOR OUTPUT LEADS 3 PHASE ........................................................... 4 wire
BEARINGS .................................................................................................... Sealed Ball
COUPLING .................................................................................................. Flexible Disc
LOAD CAPACITY (STANDBY RATING) ................................................................ 45 kW
EXCITATION SYSTEM ........................................................................................... Direct
NOTE: Generator rating and performance in accordance with
ISO8528-5, BS5514, SAE J1349, ISO3046, and DIN6271 standards.
GENERATOR FEATURES
Revolving field heavy duty generator
Directly connected to the engine
Operating temperature rise 120 °C above a 40 °C ambient
Insulation is Class H rated at 150 °C rise
All models are fully prototyped tested
VOLTAGE REGULATOR
TYPE ................................................................................................................Electronic
SENSING ................................................................................................... Single Phase
REGULATION .......................................................................................................... ± 1%
FEATURES ............................................................................................... V/F Adjustable

Adjustable Voltage and Gain
LED
Indicators
CONTROL PANEL FEATURES

SEVEN LED INDICATOR LIGHTS
ADDITIONAL FUNCTIONS

System ready
Utility sensing

Low fuel pressure
Delay on utility failure for engine start

Low battery
Engine warm-up before transfer

Low oil pressure
Delay to retransfer to utility

High coolant temp/low coolant temp
Engine cooldown timer

Overspeed
Exerciser not set


Overcrank

INTERNAL FUNCTIONS:

3 position switch (auto, off and manual)

2 wire start for any transfer switch

Communicates with the Generac RTS transfer switch

Built-in 7 day exerciser

Selectable engine speed at exercise

Governor controller is built into the master control board

Temperature range -40 °
C to 70 °C
ENGINE SPECIFICATIONS
MAKE ................................................................................................................ Generac
MODEL ................................................................................................................. Inline 4
CYLINDERS ...................................................................................................................4
DISPLACEMENT .............................................................................. 2.4 Liter, 146 cu. in.
BORE ........................................................................................................................3.41
STROKE ....................................................................................................................3.94
COMPRESSION RATIO ...........................................................................................8.5:1
INTAKE AIR SYSTEM ....................................................................... Naturally Aspirated
VALVE SEATS .......................................................................................Precision ground
LIFTER TYPE ....................................................... Overhead Valve Push Rod, Hydraulic
GOVERNOR SPECIFICATIONS
TYPE ................................................................................................................Electronic
FREQUENCY REGULATION ....................................................................... Isochronous
STEADY STATE REGULATION .......................................................................... ± 0.25%
ENGINE LUBRICATION SYSTEM
OIL PUMP ................................................................................................................Gear
OIL FILTER ............................................................................. Full flow spin-on cartridge
CRANKCASE CAPACITY ...................................................................................4 Quarts
ENGINE COOLING SYSTEM
TYPE ................................................................................................ Pressurized Closed
WATER PUMP .................................................................................................Belt driven
FAN SPEED .............................................................................................................2060
FAN DIAMETER ............................................................................................... 22 inches
FAN MODE ........................................................................................................... Pusher
FUEL SYSTEM
FUEL TYPE .......................................................................... Natural gas, propane vapor
CARBURETOR...............................................................................................Down Draft
SECONDARY FUEL REGULATOR ................................................................... Standard
FUEL SHUT OFF SOLENOID .......................................................................... Standard
OPERATING FUEL PRESSURE ..................................................................5 - 14 H2O
ELECTRICAL SYSTEM
BATTERY CHARGE ALTERNATOR .............................................................12V 30 Amp
STATIC BATTERY CHARGER .............................................................................. 2 Amp
RECOMMENDED BATTERY ...........................................................Group 26, 525 CCA
SYSTEM VOLTAGE ............................................................................................. 12 Volts
STANDBY 45 kW
KW RATING
45
ENGINE SIZE
2.4 Liter
GENERATOR OUTPUT VOLTAGE/KW - 60Hz
KW
AMP
CB Size
120/240V, 1-phase, 1.0 pf
45
187.5
200

GENERATOR LOCKED ROTOR KVA
AVAILABLE @ VOLTAGE DIP OF 35%
Single
phase

100




ENGINE FUEL CONSUMPTION
(Natural Gas) (Propane)

Natural Gas
Propane


(ft
3
/hr.) (gal/hr.)
cu
ft/hr
Exercise
cycle

102
1.11
40.4
25% of rated load

194
2.12
77.1
50% of rated load

373
4.07
148
75% of rated load

520
5.67
206.3
100% of rated load

720
7.86
286

ENGINE COOLING
Air flow
(inlet air including alternator and combustion air)
ft
3
/min. 2,725
System coolant capacity
US gal.
3.0
Heat rejection to coolant
BTU/hr.
173,000
Max. operating air temp. on radiator
°C (°F)
60 (150)
Max. ambient temperature
°C (°F)
50 (140)
COMBUSTION AIR REQUIREMENTS
Flow at rated power 60 Hz
cfm
144

SOUND EMISSIONS IN DBA
db(A) @ 23 feet in exercise mode

61
db(A) @ 23 feet at normal operating load

73