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SPECIFICATIONS
GENERATOR
Type ............................................................................. Synchronous
Rotor Insulation ....................................................................Class F
Stator Insulation ...................................................................Class F
Total Harmonic Distortion .........................................................< 5%
Alternator Output Leads 3-phase ........................................... 4-wire
Bearings .........................................................................Sealed Ball
Coupling .......................................................................Flexible Disc
Load Capacity (Standby Rating) ................................ 20/25/30 kW*
* NOTE: Generator rating and performance in accordance with ISO8528-5, BS5514, SAE J1349,
ISO3046 and DIN 6271 Standards. KW rating is based on LPG fuel and may derate with natural
gas.
Excitation System ....................................................................Direct
Generator Output Voltage/kW - 60 Hz
kW Amp CB Size
120/240V, 1-phase, 1.0 pf 20/25/30 83/104/125 100/125/150
120/208V, 3-phase, 0.8 pf 20/25/30 69/87/104 80/100/125
277/480V, 3-phase, 0.8 pf 20/25/30 30/38/45 35/45/50
Generator Locked Rotor KVA Available @ Voltage Dip of 35%
Single-phase or 208 3-phase: 20kW 25kW 30kW
34 KVA 38 KVA 56 KVA
ENGINE
Make ................................................................................... Generac
Model ..................................................................................... In Line
Cylinders and Arrangement ............................................................4
Displacement .......................................................................1.6 Liter
Bore ...................................................................................... 3.15 in.
Stroke ................................................................................... 3.13 in.
Compression Ratio .............................................................9.75-to-1
Air Intake System ...............................................Naturally Aspirated
Valve Seats ...................................................................Replaceable
Lifter Type .......................................................................... Hydraulic
Engine Parameters
Rated Synchronous RPM ..............................................60 Hz, 3600
HP at rated: 20kW 25kW 30kW
35 HP 45 HP 48 HP
Exhaust System
Exhaust Flow at Rated Output 60 Hz: 20kW 25kW 30kW
209 cfm 235 cfm 240 cfm
Exhaust Temp. at Rated Output: 910°F 1015°F 1022°F
Combustion Air Requirements (Natural Gas)
Flow at rated power, 60 Hz: 20kW 25kW 30kW
80 cfm 90 cfm 92 cfm
Governor
Type .................................................................................. Electronic
Frequency Regulation ...................................................Isochronous
Steady State Regulation ........................................................± .25%
Adjustments:
Speed ............................................................................ Selectable
Engine Lubrication System
Type of Oil Pump ......................................................................Gear
Oil Filter .............................................................Full Flow, Cartridge
Crankcase Oil Capacity ....................................................4 U.S. qts.
COOLING SYSTEM
Type .......................................................................................Closed
Water Pump .................................................................... Belt Driven
Fan Speed ................................................................................ 2450
Fan Diameter ..................................................................17.7 inches
Fan Mode ..............................................................................Pusher
Air Flow (inlet air including alternator and
combustion air) ........................................................... 2490 ft
3
/min.
Coolant Capacity ...........................................................2.0 U.S. gal.
Heat Rejection to Coolant ..........................................117,000 Btu/h
Maximum Operating Air Temp. on Radiator ..............60° C (150° F)
Maximum Ambient Temperature ................................50° C (140° F)
FUEL SYSTEM
Type of Fuel .........................................Natural Gas, Propane Vapor
Carburetor ......................................................................Down Draft
Secondary Fuel Regulator .................................................Standard
Fuel Shut-off Solenoid ........................................................Standard
Operating Fuel Pressure ...................... 5 in. - 14 in. Water Column
Fuel Consumption - ft
3
/hr (Natural Gas/LPV)
Exercise 25% 50% 75% 100%
Cycle Load Load Load Load
20kW 56/24 124/49 188/75 250/99 315/125
25kW 56/24 161/64 253/101 345/138 430/175
30kW 56/24 209/82 281/117 360/147 437/185
ELECTRICAL SYSTEM
Battery Charge Alternator ............................................12V, 15 Amp
Static Battery Charger ............................................................2 Amp
Recommended Battery ...................................... Group 26, 525CCA
System Voltage .....................................................................12 Volts
Voltage Regulator
Type .................................................................................. Electronic
Sensing ........................................................................Single-phase
Regulation ................................................................................± 1%
Features ................................................. V/F Adjustable, Adjustable
Voltage and Gain LED Indicators
Power Adjustment for Ambient Conditions
Temperature Deration:
3% for every 10° C above °C 20kW 25kW 30kW
40 40 25
1.65% for every 10° above °F 104 104 77
Altitude Deration:
1% for every 100 m above m 20kW 25kW 30kW
1220 915 182
3% for every 1000 ft. above ft. 4000 3000 600
Controller .................................................R-200
6-1
Standby Generator Sets
Specifications
GenSpec037 Rev. A 04/07