• New ListingUsed  Onan diesel generator 

    Just taken off line in good working order. Transfer Switch Included.
    $1,800.00
    0 bids
    $1,500.00 shipping
    Ending Jun 26 at 2:51PM PDT6d
    or Best Offer
    Brand: Onan
  • Military Diesel Generator MEP 002A 120/240 AC 1 & 3 Phase filters 60hz 5kw

    Good used condition Works well, diesel glow plugs good and motor does not burn oil. Tarp and spare tarp and various other accessories included. Has the trailer with good tires.The trailer brakes are not functional, wheels are free.
    $2,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • 200 KW ONAN DIESEL GENERATOR LOW HOURS RE-FURBISHED LOAD BANK TESTED

    ONAN DIESEL GENERATOR. 165 KW SINGLE PHASE. 120/240 OR 277/480 3 PHASE. ONLY 247 HOURS ON THIS LOAD BANK TESTED UNUT. ALL GENERATORS ARE REFURBISHED UNLESS OTHERWISE NOTED AND LOAD BANK TESTED. JUST A REMINDER TO FILL UNIT WITH OIL AND ANTI-FREEZE PRIOR TO STARTING AND TAKE ALL START UP PRECAUTIONS.
    $16,265.00
    0 bidsEnding Thursday at 5:59AM PDT15h 13mBrand: Onan
  • Used 125 KW Diesel Generator Onan Cummins 6C8.3 Enclosed Base Tank 1998 Low Hour

    Model : 6C8.3. Manufacturer : ONAN / CUMMINS. This machine has low hours for the age and is ready to go to work for you. Not a pretty looking enclosure, but the parts that count are solid. ITEM : 125 KW DIESEL GENERATOR.
    $13,500.00
    Brand: Onan
    or Best Offer
  • 75KW ONAN DIESEL GENERATOR RE-FURBISHED LOAD BANK TESTED LOW HOURS

    ONAN DIESEL GENERATOR. ONLY 1022 HOURS ON THIS LOAD BANK TESTED UNIT. ALL GENERATORS ARE REFURBISHED UNLESS OTHERWISE NOTED AND LOAD BANK TESTED. NOT JUST TESTED BY RUNNING THE UNIT. WE CAN GET YOU A FREIGHT QUOTE.
    $5,495.00
    0 bidsEnding Thursday at 1:29PM PDT22h 44mBrand: Onan
  • MEP-003A MILITARY MEP DIESEL GENERATOR 10KW ONAN 803 802 002 MINT REDONE ARMY

    ALL THE PARTS HAVE BEEN SANDBLASTED AND POWDER COATED OR PAINTED. THIS WAS PROFESSIONALLY REDONE. THIS GENERATOR RUNS PERFECT AND IS BETTER THAN ANY GENERATOR YOU WILL FIND ANYWHERE. THIS PRODUCES 10-14KW.
    $3,500.00
    Brand: Onan
    $600.00 shipping
    or Best Offer
    22 watching
  • Onan 75KW Generator Standby Backup w/ Transfer Switch Fuel Tank Diesel

    Tested and In Excellent Working Order! Free Shipping!
    $7,995.00
    Brand: Onan
    Free shipping
    or Best Offer
  • New Listing35 KW ONAN DIESEL GENERATOR ENCLOSED RE-FURBISHED LOAD BANK TESTED LOW HOURS

    ONAN DIESEL GENERATOR. 35 KW 3 PHASE. ONLY 488 HOURS ON THIS LOAD BANK TESTED UNIT. ALL GENERATORS ARE REFURBISHED UNLESS OTHERWISE NOTED AND LOAD BANK TESTED. JUST A REMINDER TO FILL UNIT WITH OIL AND ANTI-FREEZE PRIOR TO STARTING AND TAKE ALL START UP PRECAUTIONS.
    $7,950.00
    0 bidsEnding Jun 30 at 12:44PM PDT9d 21hBrand: Onan
  • 75KW ONAN DIESEL GENERATOR 820 HOURS

    Local city just upgraded their power source, they stated the unit ran well but did have a small leak at the top of the radiator.
    $4,885.00
    Brand: Onan
    26 watching
  • 150 kw Cummins / Onan QuietSite Diesel Generator / Genset - Load Bank Tested

    8.3L 6 Cyl. Engine - Base Tank - 654 Hours - Mfg. 2003
    $23,900.00
    Brand: Onan
  • Onan 50DGCA 50KW Diesel Generator Open Skid 533 hrs

    Standby or Prime Power Unit with Radiator Mounted Load
    $10,750.00
    Brand: Onan
    or Best Offer
  • 10KW Generator Switching Unit MEP3A NEW MILITARY ISSUE

    Throw Quantity 4 single section rear. No exceptions. Part No. SWITCH, ROTARY. Switch Actuator Indexing Position Quantity 4 single actuator. Mounting Facility Pattern four position rectangular single mounting facility.
    $175.00
    Brand: Onan
    or Best Offer
  • 75 KW ONAN DIESEL GENERATOR RE-FURBISHED LOAD BANK TESTED

    ONAN DIESEL GENERATOR. 50 KW SINGLE PHASE. ONLY 847 HOURS ON THIS LOAD BANK TESTED UNIT. KOMATSU DIESEL MODEL 0649P, SERIAL # 18543. ALL GENERATORS ARE REFURBISHED UNLESS OTHERWISE NOTED AND LOAD BANK TESTED.
    $7,995.00
    0 bidsEnding Thursday at 5:59AM PDT15h 13mBrand: Onan
  • NorthernLights by Lugger diesel generator 20KW heavy duty-continuous

    Model: 20KW. such inspections and inquiries as they deem appropriate. Sound enclosure is NOT included only what you see depicted in the photos. This sale is “as is, where is,”. Note:what you see is what you get in the photos are included.
    $6,500.00
    Brand: Onan
    or Best Offer
    23 watching
  • Used Onan Generater 50.0ddb-15R/9316A

    Model #: 50.0ddb-15R/9316A. Onan Diesel Generator. 50 KW.
    $8,250.00
    Brand: Onan
    or Best Offer
  • Onan Generator

    Unit was a back up unit at printing plant.taken out of service due to facility closing.unit has been professionally gone thru,with new injectors and fresh overhead.all new filters and fluids.triple bank tested.fuel cell and cooling system pressure tested.can deliver locally for additional charge.250kw/313kva. 480/277volts-376 amps.  240 /139volts -752amps.includes batteries.unit running. Year 1981 hours 861 Call Rob (630)550-9304
    $12,500.00
    Brand: Onan
    $18.95 shipping
    or Best Offer
  • Crankshaft, Onan/Mep-003A/Gen-Set, PN#104-1294

    Crankshaft assy. for Onan engine, 4cyl. diesel air cooled, Mdl. Complete w/ keyway set. PN# 104-1294.
    $295.00
    Brand: Onan
    $48.00 shipping
    5 watching
  • Onan Generator 7.5DKFJ Replacement Part Voltage Regulator Diesel

    Free Local Pick up in Torrance, CA available.
    $109.97
    Brand: Onan
    Free shipping
  • NorthernLights by Lugger diesel generator 40KW heavy duty-continuous

    Such inspections and inquiries as they deem appropriate. Sound enclosure is NOT included only what you see depicted in the photos. This sale is “as is, where is,”. Note:what you see is what you get in the photos are included.
    $8,500.00
    Brand: Onan
    or Best Offer
  • Onan 200kw Genset

    This is an Onan 200kw Genset that has 210 hours of use. Runs and works great with no problems. Only missing the enclosure around it.
    $16,500.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • 275KW ONAN CUMMINS STANDBY DIESEL GENERATOR LOW HOURS

    ONAN/ CUMMINS DIESEL GENERATOR (MFG 2003). CUMMINS DIESEL ENGINE QSM11-G2. 275 KW 3 PHASE. RE-CONNECTABLE 12 WIRE UNIT THREE PHASE. ONLY 117 HOURS ON THIS LOAD BANK TESTED UNIT.
    $19,225.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Military MEP-802A 5KW Diesel Generator Onan engines

    5KW Diesel Generator. Onan Engine. Engine Onan DN2M Diesel, 2 cylinder/4 stroke, 11.0hp @1800 RPM, 24VDC start, liquid-cooled. Fuels Diesel DL-1, DL-2; Jet Fuel JP-8. If you are looking at this sale you know these Military Gen Sets when properly Maintained can run for over 10,000 hours.
    $3,400.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • New Listing200 kw Cummins / Onan Diesel Generator / Genset - Load Bank Tested

    8.3L 6 Cyl. Engine - Enclosed - Base Tank - 1,447 Hours
    $23,900.00
    Local PickupBrand: Onan
  • 113 kw Cummins / Onan Diesel Generator / Genset - PRIME Rated

    8.3L 6 Cyl. Engine - 3 Phase - 12 Lead - 568 Total Hrs.
    $12,500.00
    Local PickupBrand: Onan
  • 250KW Onan Generator-Diesel-1038.2 Hours-Buyer arranges shipping

    Onan 250DFM. 1,038.2 Hours. 313 KVA.
    $16,500.00
    Local Pickup
    or Best Offer
    Brand: Onan
    27 watching
  • 125 KW ONAN DIESEL GENERATOR

    This is it Onan diesel generator 125kw , Komatsu 6 cyl turbo Diesel engine , 200 hours only ex county machine , trailer mounted , self contained , single phase and 3 phase , runs good , c 305 720 78 92
    $11,995.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • 125KW ONAN DIESEL GENERATOR- BUYER ARRANGES SHIPPING

    ONAN 125KW. 12 VOLT ELECTRICAL SYSTEM. 05-99 MFG DATE. 154 HP.
    $22,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • 80KW ONAN DIESEL GENERATOR- BUYER ARRANGES SHIPPING

    80KW ONAN GENERATOR. BASE TANK 5.9 CUMMINS 135 HP.
    $13,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Onan 30kw Gen Set diesel driven single or 3 phase

    Onan 30 kw Gen Set diesel driven single or 3 phase, approximately 70 hours on recent rebuild with 125 amp Cummins power generation auto transfer switch. Service records owner/operator manuals and wiring diagrams included. This is a really nice unit , like new , it will give you many years of dependable service . Thanks for looking . Contact me with any questions .
    $4,500.00
    Local Pickup
    or Best Offer
    Brand: Onan
    17 watching
  • Onan Diesel Generator - Off Grid - Beautiful !

    Beautiful low hour Onan Diesel 6000 Watt Generator. Perfect for an off grid set up ! (that's why I bought it but ended up building a DC gen set). pickup if we took the tires off. The battery charging function works as illustrated by the Amp gauge.
    $10,000.00
    Local PickupBrand: Onan
  • onan gen,6.0 model 6djefl,hz60 rpm1800,ph0.8,bat12,1ph0.8,1phkw6.0,kva6.0,3phkw6

    this is a gen with new computer and paper work,will run and has 4 110 plug inns plus a 220 plug inn,this is portable and is able to be pulled behind a truck or car,new diesel fuel tank,will start and run.I do have paper work.This is a good gen,will run on fuel for two days depending on how is used,this has not been abused,and has a new battery on it.Must see it run and work,to show that you want it.1-812-647-7004 please ask for Danny.Cash only. Best offer for it?Make a good offer.
    $3,800.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • 12 KW commercial generator

    Military Onan 3D Diesel generator 3 or single phase. Only 210 hours.
    $6,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • 50KW ONAN DIESEL GENERATOR- BUYER ARRANGES SHIPPING

    50 KW ONAN GENERATOR. SOUND ATTENUATED. NEW INJECTOR PUMP 3/15/2014. DATE MFG 06-08-1999. 102 HP AAT 1800 RPM. ENG MOD 4B3.9-G4. 120-240 139A 150.4A.
    $17,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Military Diesel Generator MEP-802A

    MILITARY GENERATOR SET, DIESEL ENGINE, 5kW, 60Hz. This Generator is in good running condition with only 697 HRS, new batteries, and fresh oil change. Engine: Onan DN2M Diesel, 2 cylinder/4 stroke, 11.0hp @1800 RPM, 24VDC start, liquid-cooled.
    $3,600.00
    Local PickupBrand: Onan
  • Onan Generator 60 KW Diesel 611 Hours

    What you see in the photos is what you get with regards to the generator condition as it sits. Generator is being sold in " as is " " where is " condition.
    $9,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Onan 7.5 KW Genset (Diesel) 7.5 DKD 1800 Rpm 1PH Kubota motor 

    Great running Onan 7.5 KW generator with a Kubota diesel motor. 1800 rpm with 2200 hours. 
    $2,500.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • ONAN 5A Diesel Gen Set Generator with Cooling System 7.5 KVA 21 Amp 6KW REDUCED!

    7.5 KVA 21 Amp 6KW 3-Phase. ONAN 5A Diesel Gen Set / Generator with Cooling System. Model 5A, 6.0DJB-4R/8509AA, Serial #F770240953. Start / Stop Switch. Unit is on a skid for easy loading for pick up.
    $1,500.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • 75 KW NATURAL GAS GENERATOR PROPANE CUMMINS ONAN 1 OR 3 PHASE 50 KW GENERATOR

    50 KW / 75 KW CUMMINS ONAN GENERATOR. ONAN SERIAL # A870870061 MODEL # 75.OENT-15R/19413A. (RATED AT 50 KW ON SINGLE PHASE). 75 KW ON THREE PHASE. THIS GENERATOR IS READY TO GO TO WORK! WATER COOLED EXHAUST MANIFOLDS.
    $6,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Westerbeke 10BD diesel generator 10KW heavy duty-continuous

    Such inspections and inquiries as they deem appropriate. Sound enclosure is included only what you see depicted in the photos. Model: 20KW. This sale is “as is, where is,”. Note:what you see is what you get in the photos are included.
    $5,500.00
    Local Pickup
    or Best Offer
    Brand: Onan
    16 watching
  • Skytracker searchlight 4 Beam with 30 kw Onan

    $12,995.00
    Local Pickup
    or Best Offer
    Brand: Onan
    14 watching
  • 100KW Onan Generator- 46.2 Hours-Buyer arranges carrier

    Onan 100kw Generator. 46.2 Hours. Excellent Condition.
    $10,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Onan 6.5 Kw Generator

    Onan 6.5 kW generator mounted on portable cart very desirable full output at 1800 RPM (not horrible & common 3600 rpm!).. engine great for whole house, job site or anything else. 12 gal tank. Electric start. runs great really nice setup...Shipping in Continental US an option. ▪ or Seller personal delivery to States near Colorado available depending on distance
    $2,300.00
    Local Pickup
    or Best Offer
    Brand: Onan
    12 watching
  • Onan 50kw DEG 15R Diesel Generator

    708 hours on meter Ford 6 cylinder industrial diesel engine With electric heater starts right up and runs well no smoke comes with muffler/silencer multiple voltages single or three phase local pickup forklift available for loading
    $3,150.00
    0 bids
    or Best Offer
    Ending Friday at 8:22AM PDT1d 17hLocal PickupBrand: Onan
  • Generator ONAN L634 6 cyl with Onan 30KW Diesel San diego california

    Generator ONAN L634 6 cyl with Onan. 30KW Diesel. now on the trailer in pictures. trailer goes with generator. generator will have to be wired to a breaker box not included. lightly used works great.
    $8,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Onan 7.5 Genset (Diesel) 7.5HDKDfj. 1800RPM 1PH

    Diesel Onan generator runs great. Made to run off your diesel tank. Starts right up. No issues. Would be great for a RV or back up Generator. I will set up and ship for you if needed. I would guess shipping will be around $250 but we can figure that out for you if your interested.
    $3,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • DIESEL GENERATOR TRAILER with rare Arctic kit (-50*F) - ONLY 230hrs MEP-802a

    This is a trailer mounted 5kW-6240kWa Diesel Generator (Tactical Quiet Generator). They run at 1800 rpms and are not much louder than a typical residential HVAC unit (70dba). ONLY ~238 Hours. This unit is equipped with a rare Arctic Kit which consists of a Hydronic diesel fueled turbine coolant heater that enables this unit to operate properly in temperatures down to -50 F and up to 125°F - in rain, humidity, altitude, sand/dust, salt spray, fungus, or on a 15° incline.
    $5,000.00
    Local Pickup
    or Best Offer
    Brand: Onan
  • Tech Star 55G Gen Set Generator, (Onan)

    This is a used Tech Star 55G (Onan) Generator, it only has 247 hours used. YOU PICKUP.
    $3,500.00
    Local Pickup
    or Best Offer
    Brand: Onan
    13 watching
Got one to sell?

Got one to sell?

Get it in front of 160+ million buyers.

Onan Diesel Generators

Generators can provide electricity to homes and businesses during power outages or can be used to supply power to an RV. For those considering a purchase, there is an array of diesel generators to choose from. Onan Diesel Generators include both cooling and intake components and are fully enclosed systems.

What are continuous, standby, and prime power ratings?
  • Prime power means that a generator can serve as a primary electricity source and not just a backup source. In situations where a utility source is unavailable for a period of time, a prime-power-rated generator will be able to supply electricity. This is normally the kind of generator used in industrial applications and remote areas.
  • Standby power is used in emergency situations during an outage. It is recommended for applications that have alternative and continuous electricity sources. It is also used during times of maintenance or testing, as well as during a brief electricity outage.
  • Continuous power is similar to prime but has a base-load grade. It can continuously supply electricity at a constant load. It is less appropriate for variable loads.
How do you determine what size generator you need?

Determining the right size of diesel generator to purchase involves various considerations and factors.

  • Look at the daily rate of power usage for your building.
  • Consider what appliances you want to use. If you only want to run your refrigerator and a few light switches, for example, you can get away with a smaller generator than you would need if you wanted to run power for your whole house or run an A/C unit or a furnace.
  • Consider the length of your average power outage. Larger generators can run longer between fuel refills than smaller generators.
Can Onan generators be used with one you already own?

It's possible. The need to parallel Onan generators comes about as a result of either capacity requirements or redundancy. By paralleling, you join generators using electricity. This combines the electricity output of both generators. To parallel different models, take into consideration the design, regulator design, and engine configuration.

What is the role of an automatic-transfer switch?

The automatic-transfer switch (ATS) allows for the transfer of electricity from a utility to an emergency source. The ATS is able to sense an electricity interruption on the line and signals the engine of the generator to start. Upon restoration of the standard source of electricity, the generator shuts down. The ATS can most often be found in areas such as manufacturing plants, data centers, and telecommunication networks.

Content provided for informational purposes only. eBay is not affiliated with or endorsed by Onan.
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