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dc/ac inverter

Discussion in 'Electronic Design' started by nescafe, Oct 11, 2012.

  1. nescafe

    nescafe Guest

  2. ehsjr

    ehsjr Guest

    Yes - don't do it. Your battery is too small (see
    <http://en.wikipedia.org/wiki/Peukert's_law> ) for
    anything but brief use, and the design is not intended for
    8kW per the url you posted. The transformer won't handle it,
    and the pass transistor design is wrong (no emitter resistors)
    to start with, even for 4.5 kW. If you went with the design,
    you'd likely have to double the # of transistors and the size
    of the heatsinks. With no emitter resistors you could easily
    burn out the transistors. And good luck on designing and winding
    a suitable transformer based on that url. You'd also need heavy
    cables - better would be large copper bus bars - between the
    battery and the input of the inverter. It is just not
    practical.

    What is the application? How long do you need to provide power
    to it? You might be better off buying a generator, or tripling
    the number of batteries to get 216 volts DC and running the
    application from that, provided you need to run the application
    for only a short time.
    Then there's the matter of re-charging those batteries ...

    Ed
     
  3. mike

    mike Guest

    First, I'd worry a LOT about that design. Has a lot of issues that
    could turn it into a pile of smoldering metal.

    Second, You don't day what you're doing with it, but
    I'd be wary of trying to get 100A reliably out of a 135Ah battery.

    You might be happier splitting the load, if you can, and using multiple
    smaller inverters.
     
  4. tm

    tm Guest

    Not only that but you will not get 72 volts at 111+ amps.

    tm
     
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