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Diodes

Discussion in 'Home Power and Microgeneration' started by skittles, Oct 2, 2005.

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  1. skittles

    skittles Guest

    wanting to charge a batter & was wondering which diode is right for the job?
    I've read online where people have gotten 6amps by simple hand crank and up
    to 30 amps with the use of pedal power & gears to help turn reversed
    pemanent magnetic dc motors faster then simple hand cranking.

    looking at the Radio Shack diodes: they Sell a 25 amp 50volt bridge
    rectifier
    any thoughts on this?
     
  2. skittles

    skittles Guest

    without the diode the battery will actually power up the DC Motor and also
    could result in de-charging instead of charging the battery. So that little
    3 dollar item can save you some trouble. I have searched online and people
    have this unit for sell at unreasonable prices ($600.00 and up) when the
    parts themselves are easy to come by... for example you have a Permanent
    Magnetic DC Motor in your car that powers your Fan for AC. You also have a
    few in the house for such things that require different speeds. (washing
    machine, blender, vacuum - not all will have a dc magnetic motor but some
    will) The ideal motor will run off of 24 volts AC resulting in 12 volts DC
    current enough to charge a battery -- You can use a crank to turn it but
    that's rather silly when you can run either a chain or a belt to it and turn
    it 4 times the rate with a bike or larger wheel. This will result in faster
    turning which will give you more amps. Without amps your dead in the water.
    I'd like some ideas about a voltage regulator other then a 20 amp car fuse
    which seems ideal but will not prevent over charging. any ideas - I suppose
    any ideas at all would do... I realize that a regular generator is easier to
    come by and allot more efficient but in a case like Mississippi where fuel
    became a problem they could have had the power to run household items and
    with enough ingenuity could power a water pump or other necessities,. yes
    you would need to run small watt items but it could be done...
     
  3. Steve Spence

    Steve Spence Guest

    to prevent the battery from spinning the permanent magnet generator.
     
  4. skittles

    skittles Guest

    so i suppose different size diodes are ok as long as the amp isn't to low or
    to high... any idea on how prevent the battery from over charging? Is their
    some type of voltage regulator that automatically shuts off? I know a marine
    battery will work better then a car battery will because of the fact that
    it's designed to run where as the car batteries are designed to just start
    things, but this is one area that is a little dangerous. They do
    occasionally blow up if over charged and usually kill people if their
    standing near them... and I like being alive. ( rant time) I like working to
    much and getting paid to little. I like getting screwed out of money by
    wealthy pricks in order to make themselves richer. Yes i like life... even
    if i don't like all the people in it.. I know people down south that went
    without water because they depended on the electric company to much.... Do
    you know the electric companies charged people down south even though they
    didn't have power during those weeks following the hurricane. Yes along with
    the phone companies... not a pro-rated amount either... no phone and no
    power but bills still came..
     
  5. skittles

    skittles Guest

    "Q"

    16amp diode at what voltage?
     
  6. Michelle P

    Michelle P Guest

    As long as you do not exceed the voltage you can parallel the diodes to
    obtain high amperage.
    Michelle
     
  7. skittles

    skittles Guest

  8. JoeSixPack

    JoeSixPack Guest

    The diode voltage rating should exceed your peak voltage by a fair margin to
    avoid damage from voltage spikes. A set of working diodes from an old
    battery charger or alternator would work. A simpler, lower-tech alternative
    would be a cutout relay such as was used before the advent of the diode in
    automotive charging systems. Simply wire the energizer coil of a
    single-pole relay to the output leads of the generator. When the generator
    spins up, the resulting voltage closes the relay and charging can begin.
    When the generator stops charging, the relay opens and no current bleeds
    back through generator.
     
  9. zero

    zero Guest

    You've just described a latching relay circuit.

    The generator will indeed close the contacts when it begins generating,
    the contacts will hook the generator (and the relay coil) to the battery.

    The relay won't open until the battery voltage goes away.

    To the original poster: Large full-wave rectifier blocks work just fine as
    blocking diodes you seek. They contain 4 diodes in an epoxy block with
    heatsink plate on the bottom. You only need to use 2 terminals (1 diode)
    so there is some waste of parts, but they are cheap and easy to find.

    zero
     
  10. Andy

    Andy Guest

    Find yourself an old Delco-Remy 'Delcotron' alternator at the wrecking yard
    and strip the power rectifier diode pack out of it... It consists of three
    pairs of good quality diodes that you can wire up any way you like with the
    added bonus of them already mounted in a heat sink.

    Regards,
    Andy
     
  11. JoeSixPack

    JoeSixPack Guest

     
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