Model: 8.5/12RES
Multi-Fuel
LP Vapor/Natural Gas
The Kohlerr Advantage
DThe Smart Choice
Known for its reliability, the Kohler 12 kW generator set was named a “Best Buy” as well as the highest-rated generator in a leading consumer magazine in October, 2006
DPowerful
Exclusive Powerboostt technology allows the Kohler 12 kW generator to start and run a typical 4 ton (48,000 BTU) central air conditioner, while still running other home appliances and electronics *
DClean Power for Sensitive Electronics
Protects sophisticated electronics with clean, stable power that exceeds strict utility requirements and IEEE standards for total harmonic distortion (THD)
DFast Response
Kohler generator sets restore power in as little as 10 seconds
DQuiet
Quiet operation: 65 dB(A) at 7 m maintains neighborhood solitude
D Premium Five-Year Limited Warranty
Generator Ratings
Standard Features
DADC-RES Advanced Digital Control
d Designed for today’s most sophisticated electronics
d Electronic speed control responds quickly to varying household demand
d Digital voltage regulation protects your sensitive electronics from harmonic distortion and unstable power quality
d LED display shows system status and setup information
DEngine Features
d Kohler Command PROr OHV engine with hydraulic valve lifters for reliable performance without routine valve adjustment or lengthy break-in requirements
d Digital Spark Advance Ignition (DSAI) optimizes engine performance for natural gas and LP vapor fuels (12RES only)
d Simple field conversion between natural gas and LP vapor fuels while maintaining emission certification
DDesigned for Easy Installation
d Polymer base eliminates the need for a concrete mounting pad, reducing installation time and cost
d Fuel and electrical connections through the enclosure wall eliminate the need for stub-ups through the bottom
d Load connection terminal block allows easy field wiring d Designed for outdoor installation only
DCertifications
d Meets emission regulations for U.S. Environmental Protection Agency (EPA) with both natural gas and LPG.
Note: CARB does not regulate emergency standby generators outputting less than 50 HP. Only the EPA standards apply.
d UL 2200 listed (60 Hz models)
d CSA certification available (60 Hz models)
d Accepted by the Massachusetts Board of Registration of Plumbers and Gas Fitters
DWarranty
d 5-year/2000 hour warranty for on-grid (standby) applications in locations served by a reliable utility source
d 18 month/1000 hour warranty for off-grid (non-standby) applications
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Standby Ratings |
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Natural Gas |
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LP Gas |
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Model |
Voltage |
Phase |
Hz |
Alternator |
kW/kVA |
Amps |
kW/kVA |
Amps |
8.5RES |
120/240 |
1 |
60 |
2F4 |
7.0/7.0 |
29 |
8.5/8.5 |
35 |
8.5RES |
115/230 |
1 |
50 |
2F4 |
6.3/6.3 |
27 |
7.5/7.5 |
33 |
12RES |
120/240 |
1 |
60 |
2F4 |
10.4/10.4 |
43 |
12.0/12.0 |
50 |
12RES |
115/230 |
1 |
50 |
2F4 |
9.3/9.3 |
40 |
10.5/10.5 |
46 |
RATINGS: Standby ratings apply to installations served by a reliable utility source. All single-phase units are rated at 1.0 power factor. The standby rating is applicable to variable loads with an average load factor of 80% for the duration of the power outage. No overload capacity is specified at this rating. Ratings are in accordance with ISO--3046/1, BS5514, AS2789, and DIN 6271. GENERAL GUIDELINES FOR DERATING: ALTITUDE: Derate 4% per 305 m (1000 ft.) elevation above 153 m (500 ft.). TEMPERATURE: Derate 1.5% per 5.5_C (10_F) temperature increase above 16_C (60_F). Availability is subject to change without notice. The generator set manufacturer reserves the right to change the design or specifications without notice and without any obligation or liability whatsoever. Contact your local Kohler Co. generator distributor for availability.
*Due to the cycling operation of many electrical appliances, the generator set may not run all appliances simultaneously. Check the appliance manufacturer’s specifications for actual power requirements. Consult a Kohlerr Power Systems professional for your exact residential power system requirements.
G4-97 (8.5/12RES) 4/14n
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Application Data |
Engine |
Operation Requirements |
Engine Specifications |
60 Hz |
50 Hz |
Manufacturer |
Kohler |
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Engine: model, type |
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8.5RES |
CH640 4-Cycle |
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12RES |
CH740 4-Cycle |
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Cylinder arrangement |
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V-2 |
Displacement, L (cu. in.) |
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8.5RES |
0.624 (38) |
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12RES |
0.725 (44) |
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Bore and stroke, mm (in.) |
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8.5RES |
77 x 67 (3.03 x 2.64) |
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12RES |
83 x 67 (3.27 x 2.64) |
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Compression ratio |
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8.5RES |
8.5:1 |
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12RES |
9.0:1 |
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Main bearings: quantity, type |
2, Parent Material |
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Rated rpm |
3600 |
3000 |
Max. engine power at rated rpm, kW (HP) |
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CH640, LP vapor |
11.5 (15.4) |
10 (14.0) |
CH640, natural gas |
10.0 (13.4) |
9.1 (12.2) |
CH740, LP vapor |
17.6 (23.6) |
15.8 (21.2) |
CH740, natural gas |
15.3 (20.5) |
13.8 (18.5) |
Cylinder head material |
Aluminum |
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Valve material |
Steel/Stelliter |
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Piston type and material |
Aluminum Alloy |
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Crankshaft material |
Heat Treated, Ductile Iron |
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Governor: type |
Electronic |
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Frequency regulation, no load to full load |
Isochronous |
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Frequency regulation, steady state |
0.5% |
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Air cleaner type |
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Dry |
Engine Electrical |
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Engine Electrical System |
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Ignition system |
Electronic, DSAM |
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Starter motor rated voltage (DC) |
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12 |
Battery charger, ampere rating |
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6 |
Battery (purchased separately): |
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Ground |
Negative |
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Volts (DC) |
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12 |
Battery quantity |
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1 |
Recommended cold cranking amps |
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(CCA) rating for --18_C (0_F) |
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525 |
Exhaust |
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Exhaust System |
60 Hz |
50 Hz |
Exhaust flow at rated kW, m3/min. (cfm) |
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8.5RES |
3.3 (115) |
2.7 (96) |
12RES |
3.8 (135) |
3.2 (113) |
Exhaust temperature at rated kW, dry |
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exhaust, _C (_F) |
760 (1400) |
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Lubrication
Lubricating System
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8.5RES |
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12RES |
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Cooling Air |
60 Hz |
50 Hz |
60 Hz |
50 Hz |
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Total inlet air, |
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m3/min. (cfm) |
27.8 |
(980) |
23.2 |
(820) |
28.0 |
(990) |
23.4 |
(825) |
Cooling air, |
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m3/min. (cfm) |
26.9 |
(950) |
22.4 |
(790) |
26.9 |
(950) |
22.4 |
(790) |
Combustion air, |
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m3/min. (cfm) |
0.9 |
(33.4) |
0.8 |
(28.0) |
1.1 |
(39.2) |
0.9 |
(32.6) |
Fuel Requirements
Fuel System
Fuel types |
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Natural Gas or LP Vapor |
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Fuel supply inlet |
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1/2 NPT |
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Fuel supply pressure, kPa (in. H2O): |
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Natural gas |
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1.2--2.7 (5-11) |
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LP |
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1.7--2.7 (7-11) |
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Minimum Gas Pipe Size Recommendation, in. NPT |
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8.5RES |
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12RES |
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Pipe |
Natural Gas |
LP Vapor |
Natural Gas |
LP Vapor |
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Length, |
(132,000 |
(180,000 |
(193,000 |
(203,000 |
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m (ft.) |
Btu/hr.) |
Btu/hr.) |
Btu/hr.) |
Btu/hr.) |
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8 |
(25) |
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3/4 |
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1/2 |
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3/4 |
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3/4 |
15 |
(50) |
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3/4 |
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3/4 |
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1 |
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3/4 |
30(100) |
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1 |
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1 |
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1 |
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1 |
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46(150) |
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1 |
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1 |
1 1/4 |
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1 |
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61(200) |
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1 |
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1 |
1 1/4 |
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1 |
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Fuel Consumption at % rated load |
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8.5RES |
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12RES |
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% Load |
60 Hz |
50 Hz |
60 Hz |
50 Hz |
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Natural Gas, m3/hr. (cfh) |
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100% |
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3.7 |
(132) |
3.3 |
(118) |
5.4 |
(193) |
4.8 |
(173) |
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75% |
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3.2 |
(113) |
2.9 |
(101) |
4.7 |
(163) |
4.2 |
(148) |
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50% |
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2.6 |
(93) |
2.3 |
(83) |
3.5 |
(124) |
3.1 |
(108) |
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25% |
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2.2 |
(77) |
1.9 |
(69) |
2.6 |
(93) |
2.4 |
(84) |
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LP Vapor, m3/hr. (cfh) |
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100% |
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2.0 |
(72) |
1.7 |
(61) |
2.3 |
(81) |
2.1 |
(74) |
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75% |
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1.3 |
(45) |
1.1 |
(38) |
2.1 |
(75) |
1.9 |
(68) |
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50% |
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1.0 |
(36) |
0.9 |
(31) |
1.8 |
(60) |
1.5 |
(53) |
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25% |
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0.8 |
(29) |
0.7 |
(25) |
1.2 |
(45) |
1.1 |
(40) |
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LP Vapor, kg/hr. (lb./hr.) |
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100% |
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3.7 |
(8.4) |
3.2 |
(7.1) |
4.3 |
(9.4) |
3.9 |
(8.6) |
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75% |
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2.4 |
(5.2) |
2.1 |
(4.4) |
3.9 |
(8.7) |
3.6 |
(7.9) |
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50% |
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1.9 |
(4.2) |
1.7 |
(3.6) |
3.4 |
(7.0) |
2.8 |
(6.2) |
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25% |
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1.5 |
(3.4) |
1.3 |
(2.9) |
2.2 |
(5.2) |
2.1 |
(4.7) |
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LP vapor conversion factors: |
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8.58 ft.3 = 1 lb. |
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0.535 m3 = 1 kg |
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36.39 ft.3 |
= 1 gal. |
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Nominal fuel rating: |
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Natural gas: 37 MJ/m3 (1000 Btu/ft.3) |
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LP vapor: |
93 MJ/m3 (2500 Btu/ft.3) |
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Type |
Full Pressure |
Oil capacity (with filter), L (qt.) |
1.9 (2.0) |
Oil filter: quantity, type |
1, Cartridge |
Oil cooler |
Integral |
G4-97 (8.5/12RES) 4/14n
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