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Ultracapacitors have come a long way, and still going..

Discussion in 'General Electronics Chat' started by williB, Sep 30, 2005.

  1. williB

    williB New Member

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    Ultra caps have come to Digikey ...YAY..
    you can now buy a 110 Farad capacitor with a working voltage of 2.5V for $31.20 in quantities of one..
    for more info google ' UltraCapacitor ' or the newest ' nanogate ultracapacitor.'
    or check out whats happening at Maxwell technologies
    http://www.maxwell.com/ultracapacitors/products/BMOD2600-48.html
    lots of stuff to look foward to in the future..
     
  2. Oznog

    Oznog Active Member

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    Oh it gets better...

    This EV did a burnout running entirely on Maxwell Ultracaps. No battery was connected in the loop.
    http://www.haritech.com/Woodburn2005058.MOV
    http://www.haritech.com/VictorWoodburn_divx.avi

    He didn't try to take it on a 1/4mi run, not yet at least. I think that with the power lasting only a few moments the 1/4 mi time would be less than starring.

    And ESMA ultracapacitors have something else. Try an 80 KF- that's 80 Kilo Farards- cell:
    http://www.esma-cap.com/Products/Capacitor_cells/EC353/?lang=English
    Those are asymmetric caps- they've got much higher capacitance but are tricky. They can actually lose electrolyte like a deep cycle lead acid battery and need periodic topping off in certain duties.

    ESMA is mentioning 50-60 J/kg. Note this is not much less than primary storage in lead acid batteries. Yet they can be charged in a tiny fraction of the time and with far greater charge efficiency. The problem of course is that only a small portion of the capacitor's energy would exist between 14v and 10.5v for use by 12v accessories for example. A DC/DC boost converter would be needed to deliver the power at a useful voltage. And/or a larger starting cap bank voltage with a dc/dc buck converter so it can be charged over 14v and still provide a 12.6v output.
     
  3. williB

    williB New Member

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  4. dave

    Dave New Member

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  5. williB

    williB New Member

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    Oznog , that .mov file dosnt come up.?? :cry:
     
  6. Someone Electro

    Someone Electro New Member

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    Do you have QuickTime?
     
  7. williB

    williB New Member

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    No i got rid of it .
    i dont like the way it takes over other files..
     
  8. Someone Electro

    Someone Electro New Member

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    Just intsal it and then install the program that you like so it will take back the files.I like real player.I play most of the stuff in it.

    .MOV is the format apple invented and its played in there player.

    I didnt have the filetipe overtaking problem becose i use an firefox plugin.It downloded it wen i was trying to play an MOV file.And it only works in my web brovser.

    You using IE huh?
     
  9. williB

    williB New Member

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    yeah IE.
    they didnt use .wma , shame..
     
  10. Someone Electro

    Someone Electro New Member

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    They say this format has good compresion.I dont know if thats true.

    You beter get it becose i found quite some movies on that net in mov format.
     
  11. Thunderchild

    Thunderchild New Member

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    ok so where can we downoad it from i havn't got it either
     
  12. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    ONLINE
    How about googling for 'quicktime download'?.
     
  13. williB

    williB New Member

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    These devices are amazing..
    the first thing i did was charge it up to 2.5V,and discharge it into a one ohm resistor , it took over 6 min to dishharge ! and the resistor actually got hot..!!
     
  14. Thunderchild

    Thunderchild New Member

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    ok ok i'm on my way to :?
     
  15. williB

    williB New Member

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    Anyway, :roll:
    next i charged it up to 2.5 V again and then connected it to two 1.2v NiMH cells . and it discharged initially , 1450 mA into the two cells WoW..
    These caps make an excellent buffer between a source (generater) and load (rechargeable batteries)..
     
  16. audioguru

    audioguru Well-Known Member Most Helpful Member

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    What's the capacitor for? A rechargable battery doesn't need a capacitor and operates like a huge capacitor.
     
  17. williB

    williB New Member

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    The ultra cap i got acts like a sponge absorbing the excess power the battery can not take in , and storeing it till i stop cranking the generater..
    then it passes the excess it has acumulated to the battery..
     
  18. audioguru

    audioguru Well-Known Member Most Helpful Member

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    A Ni-MH cell can "take in" just about anything you can feed it. Its internal resistance is extremely low.
     
  19. williB

    williB New Member

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    its not as low as 0.003 ohms , which is the caps ESR ..
     
  20. Oznog

    Oznog Active Member

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    Most NiMH can take several amps though, so they generally won't benefit much from a cap on them.
     
  21. williB

    williB New Member

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    Well , i think it is a really cool device ,when i charged it up to 2.5V and discharged it into the batteries the amount of current it put out was amazing .. over 1400 mA initially..
     

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