Mike Painter
Flashlight Enthusiast
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- Sep 16, 2002
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New Nanoscale supercapacitor can store 100 times more energy
- Thread starter Mike Painter
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R@ndom
Enlightened
Geez a battery made of alox and altin... Soon you'll power a McGizmo with a la petit killer...
TranceAddict
Newly Enlightened
total energy of 1 kg TNT
1 kg x 4.610 MJ/kg = 4,610,000 Joules
total energy of 1 kg nanoscale supercapacitor
1 kg x 3000wh/1kg = 3000wh = 10,800,000 Joules
imagine sudden release of all energy in 5 seconds, it will be:
power = workdone/time = 10,800,000 j / 5 s = 2.16 MegaWatt over 5 seconds.
do you dare to carry it?
1 kg x 4.610 MJ/kg = 4,610,000 Joules
total energy of 1 kg nanoscale supercapacitor
1 kg x 3000wh/1kg = 3000wh = 10,800,000 Joules
imagine sudden release of all energy in 5 seconds, it will be:
power = workdone/time = 10,800,000 j / 5 s = 2.16 MegaWatt over 5 seconds.
do you dare to carry it?
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drmaxx
Enlightened
total energy of 1 kg Lard (Fat)
1 kg x 37 MJ/kg = 37,000,000 Joules
Do I dare to carry it? I do carry a few kg around with me all the time...
jtr1962
Flashaholic
Just running some numbers:
Typical AA cell weighs perhaps 25 gm (0.025 kg).
3000 Wh/kg*0.025 kg = 75 W-hr.
Assuming cell voltage of 1.5 then we have 50 Ah AA cells! If they can pull this off then we're talking about a 20X increase in run time over what we have now. Not to mention EVs with cross-country range without a recharge.
Typical AA cell weighs perhaps 25 gm (0.025 kg).
3000 Wh/kg*0.025 kg = 75 W-hr.
Assuming cell voltage of 1.5 then we have 50 Ah AA cells! If they can pull this off then we're talking about a 20X increase in run time over what we have now. Not to mention EVs with cross-country range without a recharge.
VidPro
Flashlight Enthusiast
most of the high cap capacitors i have attempted to use in various ways have a very linear voltage decline.
gonna take some real crafty driver to ever use these things, if we ever see it move from the press releace to the store.
gonna take some real crafty driver to ever use these things, if we ever see it move from the press releace to the store.
jtr1962
Flashaholic
Anything capable of using alkaline or NiMH should be designed to handle from about 1.6V down to about 0.9V per cell (of course in practice some things aren't). Assuming a supercap is designed to be "full" at 1.6V, then you will have used 68.4% of its energy by the time it's discharged to 0.9V. In short, even without regulators capable of sucking power down to very low voltages you still only have to derate your supercap by about a third for any properly-designed equipment. So instead of 20X the runtime you'll only get 13.333X.
Granted, there are things which start giving you "low battery" warnings or fail to work at 1.4V per cell. Such devices will only use a fraction of a supercap's energy, but then again they'll do the same with a chemical cell.spencer
Enlightened
I want.
davidefromitaly
Enlightened
total energy of 1 kg Lard (Fat)
1 kg x 37 MJ/kg = 37,000,000 Joules
Do I dare to carry it? I do carry a few kg around with me all the time...
but your fat can't burn in 5 seconds
btw... what is the self discharge of this capacitor? i don't think they can be used as a replace of a battery
Kestrel
Flashaholic
VidPro
Flashlight Enthusiast
it the ULTRAcapacitor
http://www.markstechnologynews.com/2008/11/511-tactical-series-ultracapacitor.html
this was in the Banner adds up ^ there , dont know how it is missed in the relative discussion.
Magic Capacitor light that charges in 90seconds and magically runs for 90Min , AND has 270lumens output TOO, just a lot of "up to's" in the specs, totally Saturated marketing, yet i cant find anything out about it in reality at all?
? 3x4farad low voltage caps, and 3 5mm leds ? or sheer magic?
http://www.markstechnologynews.com/2008/11/511-tactical-series-ultracapacitor.html
this was in the Banner adds up ^ there , dont know how it is missed in the relative discussion.
Magic Capacitor light that charges in 90seconds and magically runs for 90Min , AND has 270lumens output TOO, just a lot of "up to's" in the specs, totally Saturated marketing, yet i cant find anything out about it in reality at all?
? 3x4farad low voltage caps, and 3 5mm leds ? or sheer magic?
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uk_caver
Flashlight Enthusiast
If there actually was a ~75Wh AA cell, it'd have to have a self-discharge measured in weeks or more to avoid self-heating, unless you were planning to store it in some kind of cooling pond for safety, and you'd have to hope that self-discharge didn't increase *too* much as it got older.
Kestrel
Flashaholic
Or vaporware?
There's a thread on them around here, a number were opened but most closed down for redundancy, IIRC.
uk_caver
Flashlight Enthusiast
90lm for 90 mins is something like 1.5Wh of power at the LED, so say maybe more like 3Wh needed from the capacitor.
If the best production ultracaps can get up to about 30Wh/kg, that'd only need about 100g, so I suppose it's at least possible.
If the best production ultracaps can get up to about 30Wh/kg, that'd only need about 100g, so I suppose it's at least possible.
Mike Painter
Flashlight Enthusiast
- Joined
- Sep 16, 2002
- Messages
- 1,863
Capacitors can store energy for long periods as it is not a chemical reaction.
Back when BIG capacitors were fairly common (quart jar size) in power supplies it was common to see them shorted out when not in use.
Static electricity and even radio transmissions can charge them to killing potential over a fairly short time.
Beacon of Light
Flashlight Enthusiast
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- Dec 9, 2005
- Messages
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If/when this occurs, even I might come around to the notion of guilt-free lumens, lol. Knowing me though I will still probably try to use my CMG Infinity to maximize the run-time provided these new cells have a low/no self discharge rate.
