progressive dishcharge of ultra capacitors

Discussion in 'General Electronics Chat' started by theantimarx, Aug 21, 2016.

  1. theantimarx

    Thread Starter New Member

    Aug 21, 2016
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    [15kw] to power e-plane. Is such a device available?
     
  2. ronv

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    Nov 12, 2008
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    Sure, how long?
     
  3. crutschow

    Expert

    Mar 14, 2008
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    Yes, but not for long at 15kW.
     
  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Some miliseconds at most? 15kW over 1 second is 15kJ. A capacitor that large I´d guesstimate to be roughly 500 grams, maybe more.
    So, a small model plane? Yes, but it will never take off. Something like the Solar impulse? Yeah sure, but there is a reason why they use batteries instead of supercaps... - supercaps are great at delivering extreme peak power, but they suck at energy stored per unit weight compared to batteries, and their charging and discharging circuits are more complicated as well.
     
  5. theantimarx

    Thread Starter New Member

    Aug 21, 2016
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    I remember a man, seeking technical advice, being condescendingly told it was impossible, yet later someone DID IT.
    I, the "antimarx" want at least 45 min. of flight time, & am interested in ultracaps because they charge VERY rapidly, and may be less expensive than Li-ion batteries. One thoughtful person mentioned LIC's.
     
  6. ronv

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    They charge rapidly because they don't have much capacity.
    Way more expensive per watt than Lipos.
    I'll byte, what's a LIC?
     
  7. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Lots of possibilities. In the context here, I suspect the TS meant Lithium Ion Capacitor. A type of supercap with higher voltage.

    The TS is concerned that anyone who points out the current limits of capacitors to provide such a power (45 minutes at 15 kW) for an electric powered airplane, is condescending. I would like see his/hers/its design so we can help improve it, rather than putting that task on us. This is a forum to help people, not do it for them.

    Go ahead, use LIC. We can find crowd funding for you at the point you have something reasonable designed.

    John
     
  8. theantimarx

    Thread Starter New Member

    Aug 21, 2016
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    Thanks John, others gave me enough of the basics, showing that ultracaps are not feasible.
     
  9. GopherT

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  10. theantimarx

    Thread Starter New Member

    Aug 21, 2016
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    A "LIC" is a Lithium Ion capacitor - [maybe the wrong abbreviation]. Someone mentioned it @ this site [though not necessarily this group or thread].
    I appreciate his help, and my search gave good technical info on them.
     
  11. theantimarx

    Thread Starter New Member

    Aug 21, 2016
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    What is the "TS"? I have an EXCELLENT airframe design, & the very high price of a motor & Li-ion batteries prompted me to find alternatives. By the way, I was there, & it was one of many valuable lessons in humility I've experienced. Also, I try not to take things personal - & I chose battles very carefully. signed, the Antimarx
     
  12. jpanhalt

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  13. ronv

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    Ahh, I see. The problem is they have about 1/20 the power for the same weight as LIPOs.:(
     
  14. dannyf

    Well-Known Member

    Sep 13, 2015
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    Yes. Lots of people can do that for you.
     
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