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Best use of 20*15000uF 400v Capacitors?

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LarsE

Wed Dec 13 2006, 12:05PM

Registered Member #153 Joined: Sun Feb 12 2006, 03:44PM
Location: Sweden
Posts: 31

I just got about 20* 15000uF 400v capacitors for about 7USD each, they are only used for about 10 hours so they are almost new.
I haven't decided yet what i going to use them for. The first thought was to build a rail-gun or a bigger disk-launcher with them but i not shure.
Anyone got a god idea what to do with them?

Tesladownunder

Wed Dec 13 2006, 01:47PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Catching the voltage reversal into an inductive load is going to take some pretty hefty diodes.
They should make for some impressive effects like blowing up steel wool or aluminium.
Here is 1.5kJ blowing up 1 inch of aluminium foil. You should be able to do better.
A lot better.

Peter

Wilson

Wed Dec 13 2006, 02:13PM

Registered Member #78 Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133

wow....thats crazy...i had to re-read the title just to make sure I'm wasn't seeing things. They're inverter grade caps, judging from the size of the terminals. It could make a ripper rail gun if you could design one correctly

Andrea87

Wed Dec 13 2006, 05:04PM

Registered Member #494 Joined: Thu Nov 09 2006, 02:42AM
Location: Udine, Italy
Posts: 31

Woot! that a so huge bank! At 380V 0,3F you get 20KJ, I would say a good serial-parrallel circuit (why not 4strings of 5 caps for 12000ÂµF 2KV) should be veeery good for a giantistic railgun, or a coin shrinker, or maybe a wire exploder... but I would prefer to put these beasts on a railgun, a biiiig one! it would be able to pass thin walls of wood, or maybe better...

ShawnLG

Wed Dec 13 2006, 05:22PM

Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399

You can build a huge coilgun which can propel huge bolts.

uzzors2k

Wed Dec 13 2006, 08:24PM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

Coin-Shrinker! 20kJ should be enough to shrink any coin, even 10kJ would probably be enough. You could also build an arsenal of "low" power coil guns, and still be able to upgrade your disk launcher. The possibilities are endless!

Just out of interest, where did you get those capacitors?

Steve Conner

Wed Dec 13 2006, 10:26PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Best use of capacitors: Sell them to uzzors at a profit?

LarsE

Thu Dec 14 2006, 04:11AM

Registered Member #153 Joined: Sun Feb 12 2006, 03:44PM
Location: Sweden
Posts: 31

Thanks for all the ideas everyone.
How god results with coin shrinking can i expect with electrolytic capacitors, i thought they was a little bit to slow?.
Maybe i go with the rail gun, i thing i got some 5*20mm copper busbar that i can use to buil the capacitor bank and 8*80mm for the rails.
So if anyone have some railgun building tips i appreciate it.

uzzors wrote ...

Just out of interest, where did you get those capacitors?

I won an action with 5 caps and the seller asked me if i wanted to buy all the other caps he had, and i did. I think they where removed from some big ABB switchgear where they was used as motor backup.
The Switchgear was going to be scraped after some testing i an testlab.

Tesladownunder

Sat Dec 16 2006, 04:27PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

LarsE wrote ...

Thanks for all the ideas everyone.
How god results with coin shrinking can i expect with electrolytic capacitors, i thought they was a little bit to slow?.
....

Highly unlikely to crush a can properly, let alone a coin. Electrolytics discharge in perhaps 1ms if you look at Jason Rolettes railgun. Pulse caps discharge in 30us. Also electrolytics don't hadle voltage reversal.
For example Sam Barros has a 3kJ cap bank which made a mild dent in a can about the same as 300J from my cap bank.

Peter

Sulaiman

Sat Dec 16 2006, 06:09PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140

I suppose you could use MOTs with the capacitors in series to make an 8 kV dc supply
for a dc-resonant-charging TC. (absolutely lethal/terrifying stored charge though)
Or design/build/test/sell 20 coilguns?
Or design/build/test 20 power-factor-corrected 330V power supplies, they'd probably sell well too.
Or 20 x 12Vdc to 400V dc then back to 14V dc smps for car stereo Uber-capacitors.
Or wire exploding / foil detonators/slappers

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