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DC to DC conventer

Discussion in 'General Electronics Discussion' started by Orzel83, Oct 16, 2014.

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  1. Orzel83

    Orzel83

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    Oct 16, 2014
    Which converter will be the best option to dissipating at least 2000W from the output of an alternator which is attached to a small petrol engine (typically 12 to 18 V).
    Thanks
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    You want to dissipate 2 kW of power? You mean, waste it - turn it into heat?
     
  3. Orzel83

    Orzel83

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    Oct 16, 2014
    yes, it will be like a load
     
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    So you want a load that will dissipate 2000W or more at 12~18V DC?

    I guess you'll need some big resistors, or perhaps a number of heater elements or jug elements in parallel.

    To dissipate 2000W at 15V you need a current flow of:

    I = P / V
    = 2000 / 15
    = 133A.

    That's a hell of a lot of current. You will need some extremely thick wires. Are you sure you know what you want?

    If that's right, you'll need a load resistance of:
    R = V2 / P
    = 152 / 2000
    = 0.1125Ω

    That's a very low resistance. You could probably achieve it by connecting a large number of jug elements, from 110VAC jugs or kettles, in parallel.

    I think you may have some numbers wrong. Perhaps you should start by telling us exactly what you want to do, and why.
     
  5. Orzel83

    Orzel83

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    Oct 16, 2014
    My project is to build an electrical load which is capable of dissipating at least 2000W from the output of an alternator which is attached to a small petrol engine (typically 12 to 18 V). This load should allow the user to set the amount of power that is to be dissipated into the load.
    For my load I have available 1ohm Power resistor.
     
  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    What is the purpose of the load? Is it designed to test the motor's output power?

    So the alternator generates 12~18V DC?

    And you have 1Ω resistors? What is their power rating? How many of them do you have?

    Did you follow my calculations? Do you realise that to dissipate 2000W at 15V requires a current of 133 amps? Do you know how thick 133A-rated wire is?

    Please answer all of those questions.
     
  7. BobK

    BobK

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    Jan 5, 2010
    Here is a bright idea: Lots of automotive light bulbs. 80 25W ones would do. And you could rent it out to road crews doing construction at night.

    Bob
     
    KrisBlueNZ likes this.
  8. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    :) Or aircraft landing lights
     
  9. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    He would have to leave a bit of current available to run the cooling fans!
     
  10. Orzel83

    Orzel83

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    Oct 16, 2014
    I have just one of that resistor with power rating up to 2.5kW (it's very huge resistor). I wold like to keep the voltage at safety range up to 50V. I was thinking to build a dc to dc boost converter with a full bridge circuitry.
     
  11. davenn

    davenn Moderator

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    for your safety
    You are playing with high power stuff and obviously have no idea what you are doing
     
    KrisBlueNZ and Arouse1973 like this.
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