Spec Sheet
G4-285 (KG80R) 9/21g
Alternator Specifications
Specifications Alternator
Manufacturer Kohler
Type 4-Pole, Rotating-Field
Exciter type Brushless, Rare- Earth
Permanent Magnet
Leads: quantity, type
4PX, 4RX 12, Reconnectable
4TX 4, 120/240 V
Voltage regulator Solid State, Volts/Hz
Insulation: NEMA MG1
Material Class H
Temperature rise
130C, Standby
Bearing: quantity, type 1, Sealed
Coupling Flexible Disc
Amortisseur windings Full
Voltage regulation, no-load to full-load ±0.5%
One-step load acceptance 100% of Rating
Unbalanced load capability 100% of Rated Standby
Current
Peak motor starting kVA: (35% dip for voltages below)
480 V 4P10X (12 lead) 275 (60 Hz)
480 V 4R9X (12 lead) 385 (60 Hz)
240 V 4T9X (4 lead) 237 (60 Hz)
Total harmonic distortion (THD) from no load to full load with
a linear load is less than 3.2%.
NEMA MG1, IEEE, and ANSI standards compliance for
temperature rise and motor starting.
Sustained short-circuit current of up to 300% of the rated
current for up to 10 seconds.
Sustained short-circuit current enabling downstream circuit
breakers to trip without collapsing the alternator field.
Self-ventilated and dripproof construction.
Superior voltage waveform from a two-thirds pitch stator and
skewed rotor.
Windings are vacuum- impregnated with epoxy varnish for
dependability and long life.
Application Data
Engine
Engine Specifications 60 Hz
Manufacturer Kohler
Engine: model, type KG6208TSD 6.2L
Turbocharged, Aftercooled
KG6208TSC* 6.2 L
Turbocharged, Aftercooled
Cylinder arrangement V-8
Displacement, L (cu. in.) 6.2 (378)
Bore and stroke, mm (in.) 101.6 x 95.25 (4.00 x 3.75)
Compression ratio 9.8:1
Rated rpm 1800
Max. power at rated rpm, kW (HP)
Natural Gas 93.6 (126)
LPG 94.6 (127)
Cylinder head material Cast Aluminum
Piston type and material Cast Aluminum
Crankshaft material Cast Iron
Valve (exhaust) material Forged Steel
Governor type Electronic
Frequency regulation, no-load to full-load Isochronous
Frequency regulation, steady state ±1.0%
Frequency Fixed
Air cleaner type, all models Dry
* KG6208TSC includes catalyst (60 Hz only).
Exhaust
Exhaust System 60 Hz
Exhaust manifold type Dry
Exhaust flow at rated kW, m
3
/min. (cfm) 18 (636)
Exhaust temperature at rated kW, dry
exhaust, C (F)
715 (1319)
Maximum allowable back pressure,
kPa (in. Hg)
12.5 (3.7)
Exhaust outlet size at engine hookup,
mm (in.)
88.9 (3.5)
Engine Electrical
Engine Electrical System 60 Hz
Ignition system Coil Pack
Battery charging alternator:
Ground (negative/positive) Negative
Volts (DC) 12
Ampere rating 130
Starter motor rated voltage (DC) 12
Battery, recommended cold cranking
amps (CCA):
Qty., rating for - 18C (0°F)
One, 650
Battery voltage (DC) 12
Fuel
Fuel System 60 Hz
Fuel type Natural Gas, LP Gas, or
Dual Fuel
Fuel supply line inlet 1.25 NPT
Natural gas and LPG vapor fuel supply
pressure, kPa (in. H
2
O)
1.74- 2.74 (7-11)
Fuel Composition Limits * Nat. Gas LP Gas
Methane, % by volume 90 min. —
Ethane, % by volume 4.0 max. —
Propane, % by volume 1.0 max. 85 min.
Propene, % by volume 0.1 max. 5.0 max.
C
4
and higher, % by volume 0.3 max. 2.5 max.
Sulfur, ppm mass 25 max.
Lower heating value,
MJ/m
3
(Btu/ft
3
), min.
33.2 (890) 84.2 (2260)
* Fuels with other compositions may be acceptable. If your fuel is
outside the listed specifications, contact your local distributor for
further analysis and advice.