2019 Kohler Engine 12RES 12 kW Generator


Kohler Engine
12RES 12 kW Generator



12RES Single Phase, Natural Gas|LP

Affordable, commercial-grade power for basic power needs. When a bad storm or utility failure knocks out your power, the 12RES KOHLER® generator keeps your lights on, fridge cold and sump pump working. This generator will power most appliances in smaller homes, or a few critical items in larger homes.*

  • Reliable: Inside this generator is a commercial-grade engine built to withstand extreme workloads year after year.
  • Powerful: In just 10 seconds, your KOHLER generator automatically restores power to your heat or AC as well as appliances and electronics.*
  • Premium warranty: We've got you covered with 5-year, 2,000-hour protection and a steel enclosure that's built to last.
  • Flexible: Fits both standby and off-grid applications for the ultimate versatility while saving the battery with hibernating controller capability
  • Money Saver: No pricey concrete pad needed. Your contractor - and your wallet - will appreciate the built-in mounting pad and easy-to-connect terminal block.
The Power You Need
  • PowerBoost™ technology provides the power to start large loads without dropping power to other appliances
  • Extraordinary peak motor-starting capacity to start and run a typical 4 ton air conditioner while still running other home appliances and electronics
  • Premium power quality delivers exceptional digital voltage and frequency regulation along with low levels of harmonic distortion to protect sophisticated electronics
  • Powered by reliable KOHLER Command PRO® engine, designed and tested for tough commercial applications; with hydraulic valve lifters to eliminate need for lengthy break-in periods and expensive valve adjustments; operation speed is 3600 rpm (the standard for air-cooled generators)
The Conveniences You Expect
  • ADC-RES Advanced Digital Control designed for today's sophisticated electronics
  • Quiet, neighborhood-friendly operation with sound levels similar to a typical central air conditioner
  • Steel enclosure with automotive-grade paint for advanced corrosion protection
  • Runs on either natural gas or liquid propane (LPG) with simple switching between natural gas and LPG in the field
  • Streamlined installation, including built-in base that eliminates need for concrete mounting pad and simple terminal block for easy field connections
  • Rated kW LP: 12 kW
  • Rated kW NG: 10.4 kW
  • Amps LP: 50 amps
  • Amps NG: 43 amps
  • Peak Motor Starting kVA @240 V: 32 kVa
  • Alternator Note: All information shown is for 1 Phase 60 Hz generator with the largest alternator option available.
  • Displacement: 0.725 L (44 cu. in.)
  • Horsepower: NG 20.5 hp, LP 23.6 hp
  • Enclosure Material: Steel
  • Sound Output During Weekly Exercise: 65 dB(A)
  • Sound Output During Full-speed Operation: 65 dB(A)
  • Response Time: 10 seconds
  • Warranty: Premium five-year limited warranty
  • Country of Origin: US
  • Certifications/Listings: CARB|EPA|UL 2200
  • Automatic Transfer Switch Included: No
  • Remote Monitoring Available: Yes
  • Off Grid / Utility Backup: Utility Backup|Off Grid
  • Weight: 400 lb. (182 kg)
  • Alternator Type: 2-Pole, Rotating Field
  • Fuel Consumption on NG at 50% load: 124 cfh
  • Fuel Consumption on LP at 50% load: 60 cfh
  • Controller: Advanced Digital Control
  • Cylinder Arrangement: V-2
  • Dimensions: 1123 mm x 726 mm x 804 mm (44.2 in. x 28.6 in. x 31.6 in.)
  • Engine Manufacturer/Description: KOHLER
  • Engine Model: CH740
  • Engine/Alternator RPM: 3600
  • Fuel Type: Natural Gas|LP
  • Frequency: 60 Hz|50 Hz
  • Phase: Single Phase
  • Voltage @ 60 Hz: 120/240
  • Digital Voltage Regulation: ±1.5%
  • Built in Mounting Pad: Yes



Engine Type
Gas: 20.5 hp; LP: 23.6 hp
44 cu. in. (0.725 L)


44.2 in. (1123 mm)
28.6 in. (726 mm)
31.6 in. (804 mm)
400 lb. (182 kg)


AC Output
10.4 kW
Noise Level
65 dB(A)

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