Boost 12vdc to 36vdc

Discussion in 'The Projects Forum' started by anotheruser1, Oct 22, 2012.

  1. anotheruser1

    Thread Starter Member

    Dec 6, 2011
    30
    4
    I have a power inverter that requires 36 vdc my battery bank and other inverters are 12 volts. It is not feasible to rewire the batteries so I need to build a high current booster. An output of 25 amps at 36 volts is needed and I have never attempted a booster circuit so any plans or drawings would be greatly appreciated.
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    36V at 25A is 900W. If you make a voltage booster to convert 12V to 36V then it wastes about 15% of the power which is 135W. Then the 12V source must provide 1035W. Then the 12V current in the booster is (1035W/12V)= 86.25A.
    That is a welder, isn't it? The wires are as thick as your fingers?
    Why bother making a new inverter to feed the 36V inverter?
     
    strantor likes this.
  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    Believe me, you really need to just stack the 12V batteries 3-up in series to get 36V and make life easier.

    A 1kW inverter from 12V is no piece of cake even for a power design company..... we spent months on that weasel.:mad:
     
  4. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    I made a 60V step down converter. I never loaded it with 12 Amps, but that's what the coils can carry. I use 2 in parallel. And one large PNP.
    The startup current can even be higher than that.

    And I drive it using an Arc welding transformer.

    For 1 kW, you normally use a transformer, not a simple coil.

    The design was based on TL494, and one large VGA cooler.
    With some efforts, I archieved about 75% efficiency (I could not measure this properly, however).

    If you use a transformer, you can get more efficiency.

    For 1kW, you really need a lab setup. And I recommend at first to build some smaller converters.
     
  5. anotheruser1

    Thread Starter Member

    Dec 6, 2011
    30
    4
    Guess not.
     
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