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Kohler 50REZGT Generator (42kW)

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3,645.00 LBS

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The Kohler 50REZGT mobile gaseous generator offers up to 42 kW (LP) or 38kW (Natural Gas) of single/three phase power at a quiet 69 dBA.


  • Single Voltage Reconnectable Model (1Ph 120/040V, 3Ph 120/208V, 3Ph 120/240V, or 3Ph 277/480V)
  • 3-Position Lockable Voltage Selector Switch Model (1Ph 120/040V, 3Ph 120/208V, and 3Ph 277/480V)
  • Single Voltage Stand-Alone Model (3Ph 347/600V)


Generator Features

  • The unique Fast-Responset X excitation system delivers excellent voltage response and short-circuit capability using a rare-earth, permanent magnet (PM)-excited alternator.
  • 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.
  • The brushless, rotating-field alternator has broad-range reconnectability when ordered without a voltage selector switch (except 600V model).
  • Self-ventilated and dripproof construction.
  • Windings are vacuum-impregnated with epoxy varnish for dependability and long life.
  • Superior voltage waveform from a two-thirds pitch stator and skewed rotor.
  • Unit-mounted radiator with 45C (113F) ambient air capability with prime rating.
  • NEMA MG1, IEEE, and ANSI standards compliance for temperature rise and motor starting.

Engine Features

  • General Motors 4.3L 4-cycle engine.
  • Operates on LP gas, LP liquid withdrawal, or natural gas fuel supply.
  • Lockable battery disconnect switch.
  • Battery, battery rack, and cables included.
  • Heavy-duty air cleaner with air restrictor indicator.
  • Engine oil and coolant added.
  • 110% environmental containment basin for oil and coolant.
  • Oil drain extension.
  • Three-Way Exhaust Catalyst.

Gaseous Fuel System Features

  • Includes fuel mixer, electronic secondary gas regulator, gas solenoid valve, and flexible fuel line between the engine and the skid-mounted fuel system components.
  • LP Liquid Fuel Filter.
  • LP Liquid Withdrawal (vaporizer).
  • Three-Way Fuel Valve (for connection of a user-supplied external fuel source).
  • Optional trailer-mounted LP fuel tanks for 24-hour run time (minimum). Lockable fuel tank access doors to each tank fill port. Fuel level shown on Controller.

Decision-Maker 3500 Controller Features

  • Provides advanced control, system monitoring, and system diagnostics for optimum performance and compatibility.
  • Digital display with adjustable contrast and menu control provide easy local data access.
  • Paralleling capability with bus sensing, first-on logic, synchronizer, and (isochronous, droop, and external controlled) load sharing.
  • Remote communication thru a PC via network or serial configuration.
  • Controller supports Modbus protocol.
  • Integrated hybrid voltage regulator with +/-0.5% regulation.
  • Potted circuitry for protection from vibration and debris.
  • Built-in alternator thermal overload protection.
  • NFPA 110 Level 1 capability.
  • Security cover.

Customer Connection Panel Features

  • Emergency stop switch.
  • Remote start/stop connection.
  • 120V 15A Shore power connectors for battery charger and block heater.
  • 250A main line circuit breaker for reconnectable and selector switch models (field adjustable). 60A main line circuit breaker for 600V model (field adjustable).
  • Load Lug Connections: 1 load lug per phase, #6-350MCM, 400A rating.
  • Receptacle and cam-lock options (see below).

Enclosure Features

  • Durable steel, sound-attenuating housing with quiet operation of 69 dB(A) @ 7 m (23 ft.) with full load at the prime rating.
  • Stainless steel hinges and lockable latches on doors.
  • Single-point lifting eye and four-point tie down system.

Trailer Features

  • Single-axle trailer with electric brake system and battery back-up breakaway system.
  • DOT and TC (Transport Canada) compliant per current specifications published by both agencies, at the time of trailer manufacture.
  • 2 5/16" ball hitch coupler (optional Lunette eye available).
  • Lockable utility tool box with bottle jack, lug wrench, and fire extinguisher. Common key to enclosure.
  • Running lights with 7-wire harness and connector.
  • Front tongue jack.
  • Rear stabilizer trailer jacks.
  • Weight bearing fenders up to 500 lbs.

50REZGT Spec Sheet

OPTIONS (Order with Generator)

  • Convenience Receptacles: Two 15A 120V GFCI duplex receptacles and Three 50A 240V twistlock receptacles (with individual circuit breakers)
  • Color-Coded Camlock Style Load Connectors
  • Battery Charger
  • Cold Weather Package (includes block heater and battery heater pad/wrap)
  • 15 Relay Dry Contact
  • Spark Arrestor
  • Optional trailer-mounted LP fuel tanks for 24-hour run time (minimum). Lockable fuel tank access doors to each tank fill port. Fuel level shown on Controller.
  • Spare Tire
  • Lunette Eye (for pintle hitch tow vehicles)
  • Wheel Chock Blocks
Standby Power:
LP: 42kW/52kVA 3Ph, 37kW/37kVA 1Ph; NG: 38kW/47kVA 3Ph, 37kW/37kVA 1Ph
Prime/Continuous Power:
LP: 40kW/50kVA 3Ph, 35kW/35kVA 1Ph; NG: 36kW/45kVA 3Ph, 35kW/35kVA 1Ph
Amperage - 3 Phase (Prime):
LP: 138A @ 120/208V, 120A @ 120/240V, 60A @ 277/480V, 48A @ 347/600V; NG: 124A @ 120/208V, 108A @ 120/240V, 54A @ 277/480V, 43A @ 347/600V
Amperage - 1 Phase (Prime):
145A @ 120/240V
Voltage Options - 3 Phase:
120/208, 120/240, or 277/480 (12-Lead Reconnectable), Optional 347/600 also available (6-Lead)
Voltage Option - 1 Phase:
Optional Voltage Selector Switch:
1Ph 120/240V, 3Ph 120/208, & 3Ph 277/480V
Voltage Regulation:
+/- 0.5%
Frequency Regulation:
+/- 0.5%
Power Factor:
3Ph: 0.8, 1Ph: 1.0
Kohler, 4-pole, Rotating field, Self-ventilated, Drip-proof, Brushless, Rare-Earth, Permanent Magnet, Single bearing, Class H
Receptacles (Single Phase):
Optional (See Options)
Sound Level:
69 dBA
General Motors, Industrial Powertrain, Vortec 4.3L, V-6, 4-cycle, Natural Aspiration, 101.6 x 88.4 Bore x Stroke, 1800 rpm, Electronic Governor
Engine Starting System:
Natural Gas, LP Gas, and LP Liquid Withdrawal
Fuel Consumption - LP:
5.9 cubic meters per hour at full load (prime)
Fuel Consumption - NG:
14.7 cubic meters per hour at full load (prime)
Dimensions LxWxH (inches):
171 x 84 x 80 (w/o LP fuel tank), 171 x 84 x 98 (w/ LP fuel tank)
Weight w/o LP Fuel Tank:
3645 lb.
Weight with LP Fuel Tank:
4719 lb. (w/o fuel)
Generator Warranty:
3 years / 3000 hours
Trailer Warranty:
1 year

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