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bike power

Discussion in 'Home Power and Microgeneration' started by Winston, Nov 29, 2004.

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  1. Winston

    Winston Guest

    Yup. Back of the envelope arithmetic says you will produce about
    as much power as it takes to drive the cooling fan you will need.

    Good exercise though. Aerobic.

  2. skittles

    skittles Guest

    looking for plans on making a small bike powered generator:

    anybody have them ?

    I read online that these have been used to run small computers and other
    household items...
  3. Astro

    Astro Guest

    A good rider will generate about 200w on a steady, moderately hard ride.
    Going very hard for 30 minutes, a strong rider will generate about
    250-300w. (Numbers I've measured as a long term bike racer).

    I'd guess that a non-racer could generate 125-150w without killing
  4. Winston

    Winston Guest

    We did this one to death.
    Google Groups: Search on "Bicyle Generation - How Much?"
    November of 2003, 27 articles.
    (The misspelling was original.)

  5. bw

    bw Guest

    150 watts is optimistic for non-racer to maintain for an hour. Most people
    would be lucky to hold 50 watts, but an average adult male in good health
    may be able to sustain 100 watts for an hour.
  6. Gymy Bob

    Gymy Bob Guest

    Would that be enough to run a home icecream maker?

  7. Ecnerwal

    Ecnerwal Guest

    Well, the one sitting in the kitchen has a nameplate rating of 144
    watts, but I'd bet that's the stall rating - it certainly spends most of
    the cycle doing not much. I like it more for the boredom savings than
    the work savings - I don't mind the end of the cycle where you're
    fighting to fluff a bit of air into the mix, but the long period when
    you're waiting for it to think about freezing a bit gets dull quickly.
  8. Gymy Bob

    Gymy Bob Guest

    There you go...the perfect perpetual motion machine:

    Icecream in... pedalling out
    Motion in... electricity out
    Electricity in.... icevream out
    Icecream in... pedalling out

  9. Steve

    Steve Guest


    I built the project described in the article GLC1173 references. I can
    recommend it as a learning experience, if you can deal with 120 VAC at
    something other than 60 Hertz. It puts out something higher, but it's been
    years, so for give me for guessing it was say 400 to 600Hz. I used it to
    power a Kenwood TS-520 to get those extra multiplier points for Field Day.
    (If you aren't a Ham, this is a mostly solid state radio, but has _Tubes_ for
    the transmitter output.) It was all I could do to run it long enough to wait
    for the tubes to warm up, find someone to make a contact, then actually make
    the contact. Was able to output ~50 watts RF to the antenna. I estimate 175
    watts was being delievered to the radio during transmit. Oh, this was on CW
    (Morse code) so we'll have no cheating using SSB (voice), where the duty
    cycle during transmit is ~30%. So during key down, it was 175 watts.
    Weights were required in the bike wheels (i.e. a fly-wheel) to smooth out the
    radically changing load created by the CW keying. Sort of like biking up
    stair steps!

    The project from the Ham Radio magazine is meant to supply 120 vac as it was
    being used. No batteries for "back up." You should be cautioned for using
    it with sensitive electronic devices. One would NOT connect the load 'till
    after it had stabilized, as it shot to ~200 VAC during start up. Blew
    several light bulbs during my first tests. Though it used a car alternator,
    it was reasonably efficient, as it was run at like 24 to 36 VAC output to
    reduce IR losses, then into a step-up transformer to get to 120VAC. (The
    diodes were removed from the alternator.)

    I could do a 50 watt light bulb for as long as I cared to pedal. But the power
    curve was steep.... for light bulbs at the following ratings...
    75 watts, 40 minutes
    100 watts 20 minutes
    150 watts 3 to 5 minutes
    200 watts, heart attack immediately, call the bamulance, (mis spellin' on

    Have fun, Steve
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