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one hell of a battery pack

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polop

Thu Apr 09 2009, 07:18PM

Registered Member #1537 Joined: Thu Jun 12 2008, 06:44PM
Location:
Posts: 51

have a look at this a bit of wiring and you could be the proud owner (peak voltage) 453.6volt battery capable of 44 amps that is nearly 20kW of power.

Dr. H.

Thu Apr 09 2009, 07:48PM

Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486

What are you going to do with it ?

Cheers

...

Thu Apr 09 2009, 08:41PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

Until one of the cells decides to go nuclear on you and you have 20kw of power going into exploding one of the cells

Whatever you do be careful with that beast, it wouldn't be a force to be reckoned with. Not to mention you would take days to charge it

polop

Sun Apr 12 2009, 10:43PM

Registered Member #1537 Joined: Thu Jun 12 2008, 06:44PM
Location:
Posts: 51

i'm not buying a whole box, i was just commenting on the destruction these things are capable of, it could all fit in a back pack, think walking death machine lol

ps they sell them individually for a good price

Renesis

Sun Apr 12 2009, 10:59PM

Registered Member #2028 Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319

i was just commenting on the destruction these things are capable of, it could all fit in a back pack, think walking death machine lol

Like suicidebombers that dont need to commit suicide? A re-usable terrorist in other words?

polop

Mon Apr 13 2009, 01:11PM

Registered Member #1537 Joined: Thu Jun 12 2008, 06:44PM
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Posts: 51

well you could say that, an ecological terrorist is not at the top of electronic engineers to-do list atm lol. im thinking more of perhaps an automatic coil gun, i don't know how happy they would be but definitely each one could peak for a couple of seconds at 80 or 90 amps, half the packs in series to give peak voltage of 225v and current of 160-180 amps, though i know with normal efficiencies the speed of projectile would be low

Renesis

Mon Apr 13 2009, 08:50PM

Registered Member #2028 Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319

Im on thin ice here, but i have heard that the military did experiment with handheld coil- or railguns. And that they abandoned the project because or an insane recoil.

They are currently developing a railgun to be mounted on a ships deck though. I cant wait to see that

KLH

Wed Apr 15 2009, 07:55AM

Registered Member #1819 Joined: Thu Nov 20 2008, 04:05PM
Location:
Posts: 137

polop wrote ...

well you could say that, an ecological terrorist is not at the top of electronic engineers to-do list atm lol. im thinking more of perhaps an automatic coil gun, i don't know how happy they would be but definitely each one could peak for a couple of seconds at 80 or 90 amps, half the packs in series to give peak voltage of 225v and current of 160-180 amps, though i know with normal efficiencies the speed of projectile would be low

You certainly wouldn't need a battery pack like that to make a rapid fire coilgun. A well-designed boost converter or flyback converter can easily charge anywhere from 100J per second up to 1500J per second (higher is possible, but my calculations show that it would be increasingly difficult to make one that powerful due to cost or difficulty in making the inductors). A converter like this would certainly surpass the performance of a large, bulky, battery pack that is not designed for coilgun-power pulse discharges.

The very clear benefit of using a battery pack like this would be that it would last a lot longer, compared to a battery-powered boost or flyback converter. (And I know someone is going to interject with the comment: Why don't you just use mains?)

Fnord

Thu Apr 16 2009, 12:21AM

Registered Member #2004 Joined: Sat Feb 28 2009, 11:43PM
Location:
Posts: 39

wrote ...
You certainly wouldn't need a battery pack like that to make a rapid fire coilgun. A well-designed boost converter or flyback converter can easily charge anywhere from 100J per second up to 1500J per second

I have to agree there. The little flyback charger I just finished is only a 2x2x2" cube, and it'll put out an easy 50J/second with an 18vt cordless drill battery. I haven't even tweaked it yet for max power output.

wrote ...
...Why don't you just use mains?

Well, because a coilgun that can be held or mounted on a gokart is more fun than one that stays bolted to the table :)

--------

Back to the original topic, I suppose you could use such a large battery pack to make a mobile flux wire welder. It would be good for outdoor stuff when you can't run a big extension cord.

Or you could make an awesome electric skateboard.

Fraggle

Thu Apr 16 2009, 12:28AM

Registered Member #1526 Joined: Mon Jun 09 2008, 12:56AM
Location: UK
Posts: 216

On a Go-Kart you could use a pulsed alternator.

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