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  1. #71
    Epic Contributor Soundguy's Avatar
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: PTO vs Gas Engine Generator

    Quote Originally Posted by aczlan View Post
    Did you read the PDF I linked? It has a table with x PTO HP used = y gallons of fuel used per hour.
    Of course you will use less fuel running a tedder than you would running a bush hog, but that tractor will use ~1.7 gallons of fuel per hour just to spin the engine at 2200 RPM.
    No.. obviously he didn't.. or didn't understand what he read.

    load determines fuel usage...

  2. #72
    Silver Member daybreak1998's Avatar
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    Northern Virginia
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    Lots of John Deere tractors

    Default Re: PTO vs Gas Engine Generator

    Quote Originally Posted by Soundguy View Post
    No.. obviously he didn't.. or didn't understand what he read.

    load determines fuel usage...
    Howdy,
    The problem is I did read it.
    The answer is I have real world results, but with a different tractor. I saw the JD 5105m listed as his tractor. He said he has a 105hp tractor. To me that is then really into the 6000 series tractor. But with all the naming changes with Deere tractors, I dunno.

    True.. a 25kw pto generator running off a 48hp tractor totally loaded amp load to 25kw prime. Yes, it will swallow some diesel. Tractor data shows his 5105m can have the 540e mode. I am not sure if he ordered that. (yes, lots of folks flip the shaft and run 1000 pto speed then with a converter (21-spline to 6-spline))
    Later Mike ~~~
    JD green here
    tractors and implements

  3. #73
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: PTO vs Gas Engine Generator

    no matter HOW you do it. load determins fuel usage.. period...

  4. #74
    New Member
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    Dec 2012
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    11
    Location
    Westminster ,Maryland
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    John Deere 750

    Default Re: PTO vs Gas Engine Generator

    Mike,
    fuel consumption would be the same if you were running the tractor at 2500 rpm with or with out the generator i imagine as you will need th pto up to a certian speed to generate the power. to generator 25kw u will need a very large coiled motor . what were you lookin at for voltage and amperage? you might want to generate 3 phase power say 480v and step it down with a transformer if you need a lot of power. always consult an electrical engineer before you go into anything like this prior to putting down any green backs.
    Good luck
    Mark

  5. #75
    Bronze Member davel8257's Avatar
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    Jul 2012
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    Location
    odon, IN
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    kioti DS4510HST

    Default Re: PTO vs Gas Engine Generator

    A theoretical approach based upon the energy content of diesel fuel is interesting. Here's a link to a website that converts Kwh to gallons of diesel fuel: Convert kWh to gallon [U.S.] of diesel oil - Conversion of Measurement Units

    If you plug in 10Khw, it comes up with .245 gallons (per hour). That's the theoretical maximum, no friction, no losses, 100% efficiency. If our cars could do that, we'd all be getting more than 100 MPG.

  6. #76
    Super Star Member
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    Mar 2008
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    10,597
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    Northern Fingerlakes region of NY, USA
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    Kubota L3830GST, B7500HST, BX2660

    Default Re: PTO vs Gas Engine Generator

    Quote Originally Posted by Mark Petrowicz View Post
    Mike,
    fuel consumption would be the same if you were running the tractor at 2500 rpm with or with out the generator i imagine as you will need th pto up to a certian speed to generate the power.
    Not so. Take a look at page 3 of my link earlier.
    From that page:
    HP - RPM - Gal/hr
    91.76 - 2100 - 5.71
    68.65 - 2106 - 4.51
    45.54 - 2093 - 3.35
    22.88 - 2103 - 2.21
    0.59 - 2107 - 1.15

    So, 91HP used at 2100 engine RPM burned 5.71 gallons per hour while 22.8 HP used at 2103 engine RPM burned 2.21 gallons per hour and 0.59 HP used at 2107 engine RPM burned 1.15 gallons per hour.

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  7. #77
    New Member
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    Westminster ,Maryland
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    John Deere 750

    Default Re: PTO vs Gas Engine Generator

    Aaron,
    Thanks for the info.

  8. #78
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: PTO vs Gas Engine Generator

    Quote Originally Posted by Mark Petrowicz View Post
    Aaron,
    Thanks for the info.
    yep.. it's not the 'rpm' that uses the fuel.. it's the LOAD... load determins fuel. though you will get a practical 'floor' where you will have some minimum amount of fuel usage no matter what.. etc..

  9. #79
    Member msch2112's Avatar
    Join Date
    Dec 2012
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    43
    Location
    Reno, NV
    Tractor
    JD 5105m

    Default Re: PTO vs Gas Engine Generator

    Quote Originally Posted by aczlan View Post
    Not so. Take a look at page 3 of my link earlier.
    From that page:
    HP - RPM - Gal/hr
    91.76 - 2100 - 5.71
    68.65 - 2106 - 4.51
    45.54 - 2093 - 3.35
    22.88 - 2103 - 2.21
    0.59 - 2107 - 1.15

    So, 91HP used at 2100 engine RPM burned 5.71 gallons per hour while 22.8 HP used at 2103 engine RPM burned 2.21 gallons per hour and 0.59 HP used at 2107 engine RPM burned 1.15 gallons per hour.

    Aaron Z
    i can't believe a 7rpm increase resulted in a 4.56gph reduction! guess it's the decrease in HP.

    Mike

  10. #80
    Super Star Member
    Join Date
    Mar 2008
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    10,597
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    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: PTO vs Gas Engine Generator

    Quote Originally Posted by msch2112 View Post
    i can't believe a 7rpm increase resulted in a 4.56gph reduction! guess it's the decrease in HP.
    Yes, it is all about the HP used. Compare the numbers for 68.65 HP (2106 RPM, 4.51 GPH), 45.54 HP (2093 RPM, 3.35 GPH) and 22.88 HP (2103 RPM, 2.21 GPH)

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

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