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  1. #1
    Bronze Member
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    Apr 2008
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    74

    Default pto generator

    I am looking into a pto generator as we start moving into winter. The best option available seems to be the northern tools generator

    One issue I see is that I have a ford 1100 which is rated at 13hp but there seems to be consensus on 2hp for every Kw for a pto gen. In the past I have never found that little shibaura engine to struggle with anything, but I wonder if anyone has any experience with a similar situation, or any opinion on matching this gen to a 13hp tractor.

  2. #2
    Elite Member RobJ's Avatar
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    Jul 2005
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    3,482
    Location
    Spring, TX (Houston)
    Tractor
    Kubota L2500

    Default Re: pto generator

    First up, I just never have seen the appeal of a PTO generator. JMHO.

    But around here you can get a stand alone gas model in the same size and price. And you won't lose the lights and heat if you need to plow the drive or go play on the tractor.

    Rob
    L2500

  3. #3
    Super Member Gary Fowler's Avatar
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    Jun 2008
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    9,526
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    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: pto generator

    You can use a bigger gen set, you just wont be able to load it past the point of your HP. Standard rule is 1 Horsepower will produce .746 KW max load. If you have 13 PTO HP you could use a 10KW gen set continuous rating which would be more like 12.5 surge.
    Check out this website for some pricing info
    http://www.ssbtractor.com/PTO_generators.html

  4. #4
    Platinum Member srjones's Avatar
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    Mar 2006
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    542
    Location
    Columbia County, Oregon, USA
    Tractor
    Mahindra 2015HST & Mitsubish R1500

    Default Re: pto generator

    I'm not familiar with your tractor, but does it have a different PTO rating than engine rating? (they often do).

    Even if so, I think your 13HP engine should be able to handle it just fine. The key thing to keep an eye one is your load. It's good to have a some headroom for surge capacity (like motor startups, etc.) Also, as your load increases you may or may not have to adjust the RPM engine speed to stay within the correct voltage/frequency range. A little gadget like the Kill-a-watt will help with all of that and more.

  5. #5
    Bronze Member dogtired's Avatar
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    Sep 2008
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    54

    Default Re: pto generator

    http://www.ssbtractor.com/PTO_generators.html


    I can see something like that to tow to a location and use for short term stuff, like building a barn or such.
    I could not see running a tractor at 540 RPM for hours on end to power a home though .

    For that I would prefer a stand alone unit as someone else stated.

  6. #6
    Elite Member
    Join Date
    Oct 2000
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    3,055
    Location
    Windham County, Conn
    Tractor
    Ford 2120 , New Holland TN75D, Hitachi UH083LC Excavator

    Default Re: pto generator

    Quote Originally Posted by Gary Fowler View Post
    You can use a bigger gen set, you just wont be able to load it past the point of your HP. Standard rule is 1 Horsepower will produce .746 KW max load. If you have 13 PTO HP you could use a 10KW gen set continuous rating which would be more like 12.5 surge.
    Check out this website for some pricing info
    PTO Generators - Power Takeoff Generators / Power Take off Tractor Generators - SSB Tractor

    1 hp equals 746 watts. That's not just a standard rule but an exact conversion factor of one measure of energy to another. In reality when you convert rotational energy (pto hp) to electrical energy through a alternator it is not a 100% efficient process hence the 2 hp per kw that some suggest. It all depends on the efficiency of the alternator. Larger well build (expensive) alternators tend to be more efficient.

    Andy

  7. #7
    Silver Member
    Join Date
    Sep 2006
    Posts
    178
    Location
    ohio
    Tractor
    kabota

    Default Re: pto generator

    I own the northern tool pto generater pictured behind a yanmar 2000 . ran it with the pto in 2nd (2000 rpm )gear for 15 hrs.( 5 gallons of fuel).Ran hot water heater refrigerater microwave tv lites computer. would not run dish washer. did not try furnace. heard it may not handle a microprocesser. It is mounted on a carryall with a square dolley mounted on bottom.

  8. #8
    Veteran Member Rara Avis's Avatar
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    Oct 2006
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    2,038
    Location
    VT, ND & OH
    Tractor
    John Deere

    Default Re: pto generator

    You might want to peruse this before buying a PTO Generator...
    Tractor-Driven Generators: Producing Quality Power

  9. #9
    Silver Member
    Join Date
    Aug 2004
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    133
    Location
    Southern Wisconsin
    Tractor
    New Holland TC33DA hydro w/supersteer

    Default Re: pto generator

    Quote Originally Posted by RobJ View Post
    First up, I just never have seen the appeal of a PTO generator. JMHO.

    But around here you can get a stand alone gas model in the same size and price. And you won't lose the lights and heat if you need to plow the drive or go play on the tractor.

    Rob
    I seem to be finding the same thing here. I thought the PTO generator would be cheaper because there was no separate engine. I also like not having to maintain a second engine, but the economics just aren't worth it. The only advantage I've found so far is if you need a BIG generator. Then, the PTO units start to make some sense.

    Has anyone found a small (say, 5000 watts or so), cheap, PTO generator?

  10. #10
    Elite Member RonMar's Avatar
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    May 2005
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    2,808
    Location
    Port Angeles WA
    Tractor
    Jinma 284 delivered 06/28/05

    Default Re: pto generator

    Quote Originally Posted by Gary Fowler View Post
    You can use a bigger gen set, you just wont be able to load it past the point of your HP. Standard rule is 1 Horsepower will produce .746 KW max load. If you have 13 PTO HP you could use a 10KW gen set continuous rating which would be more like 12.5 surge.
    Check out this website for some pricing info
    PTO Generators - Power Takeoff Generators / Power Take off Tractor Generators - SSB Tractor

    Yep, AndyMA is correct. The term Kilowatt is not used only to represent electrical capacity. It is also used to represent mechanical output. 1HP = .746KW is a direct conversion, and represents mechanical KW. IE, a 6HP engine is 4.48KW of mechanical power. As Andy said, frictional losses in the drive train and the conversion efficiency of the electrical generator make that 1HP to .746 electrical KW an impossibility. For sustainable power output, the 2HP per electrical KW rule of thumb is pretty much right on. This is also seen quite regularly in production generators. As a rule a box store 5KW(max, not surge) generator typically has a 10HP engine. 13PTO HP will get you just shy of 7KW sustained electrical load output.
    Ron

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