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I have a 74v DC to 110v AC converter and I would like to know how many amps I can expect out of it? I am not sure how to calculate it.

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Locomotive systems run at 64 VDC. The 74Volts is there when the engine is running jst like on a car where the 12 volt battery is actually being charged a little higher, around 15 or 16 volts. Enough on that though.
Most of our battery systems consist of two 32 volt batteries connected in series and most of our starters are 32volts also connected in series except for a few locomotives acquired through mergers which have two 64 volt starters hooked in parallel.
As far as running things in the cab. Most of our cabs have what looks like a standard 110 volt outlet in them for running test equpment or whatever. There is 64 volts dc at these outlets and we have plugged regular 110 volt computer power slupplies into them for running laptops with no problems although I would not say that this would work on every one and I would be a little afraid to try it on one of my own computers for fear of burning something up.

Posted on Jul 22, 2010

  • ikechukwu joshua
    ikechukwu joshua Jul 22, 2010

    I guess what you are thinking is: Can I use a Locoverter to convert
    74VDC down to 12VDC and then add an inverter to step up the 12VDC to
    110VAC...?

    In theory, yes, (although not very efficient) but looking at these
    locoverter products, I don't believe their current is enough to then run
    an inverter.

    Consider, if you want 110VAC and 100 Watt, your 12 VDC supply must at
    least deliver 10 Amp!

    If you are desperate and skillful enough then you are probably better
    off building a 74VDC to 100VAC inverter yourself, something like

    http://www.interq.or.jp/japan/se-inoue/e...

    But of course, you need to make sure the DC side (component
    specifications) can run at 74VDC, and the output transformer should be a
    110 / 75 Volt type.

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