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Supercapacitor safety

Discussion in 'General Electronics Discussion' started by Anon_LG, Dec 12, 2015.

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  1. Anon_LG

    Anon_LG

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    Jun 24, 2014
    If current is the factor which kills, surely a low voltage supply (under normal conditions, ie, dry skin, non conductive clothing etc) provides no risk of harm? I ask this as I am continuing my capacitor research, namely super capacitors. Here states that the super capacitor due to low ESR can create a spark through shorting the contacts. If the capacitor has a rated limit of 2.5 volts, this is nowhere near enough to drive the miliamps through the body required to kill. I just want to check before proceeding, under what circumstances would even low voltages pose a threat at?

    Thanks,
     
  2. dorke

    dorke

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    Jun 20, 2015
    The supercaps are very dangerous !even at very low voltages(2.5V)
    The high capacity and extremely low ESR allows for huge currents in short condition.
    Never short them!

    You probably missed that tread ,make sure you see the video in reply #8 ...scary:eek:
     
    Anon_LG likes this.
  3. Anon_LG

    Anon_LG

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    117
    Jun 24, 2014
    So the danger comes solely from burn hazard and capacitor explosion? Under these two conditions then:

    1. The capacitor does not short
    and
    2. The capacitor does not blow(due to, for example, over voltage charge)

    Are there any other dangers whatsoever? I had assumed that the two dangers you mention in your post are dangers associated, however certainly not the extent you described! Thanks for the post.
     
  4. duke37

    duke37

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    Jan 9, 2011
    If there is inductance in the circuit, then high or very high voltages can be generated.
     
  5. cjdelphi

    cjdelphi

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    Oct 26, 2011
    I have a 400F 2.7v cap charged via a switching reg with it's current limited to 1 amp (1amp 12v psu) i then step up the voltage to 5v, then i limit the current to the 1w LED to supply 350ma

    The 400F cap gives about 20 - 30 minutes of light...

    Or you could short out a 400F with some wire, melt the wire, burn yourself and maybe even start a fire with one...

    However the same can be said for a lithium battery.... so just be careful you'll be ok
     
  6. Supercap2F

    Supercap2F

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    Mar 22, 2014
    Have to share this video:

    Super great info on electrical hazards.
    Dan
     
  7. Anon_LG

    Anon_LG

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    Jun 24, 2014
    Thank you all, this is very helpful. Continuing my research with these factors in mind.

    Thanks Supercap for your video pertaining to electrical shock and in turn, supercaps.

    Thanks,
     
    Supercap2F likes this.
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