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Registered Member #185
Joined: Thu Feb 16 2006, 07:13AM
Location: Germany
Posts: 2
What size of arc could you draw when you put about thousend of Lead Acit Accumulaotrs in serie. This would give you 12kVDC and some hundred Amperes. Im not able to get thousend accumulators, this would cost me more than 8000€ and I don't have the space for it... Well I think this would be sick. And what happens when you put all paralell, i bet you could get over 100kA.. good source for a powerful rapid fire coilgun ^^ nah you would have to cool down the coil with liquid oxygen or something else.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Have you seen that video of substation HV interruptor opening and failing to extinguish the arc? That was ~100Amps... (the arc was hundred feet long IIRC)
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Say the batteries sag to 6v at their 300A cold cranking rating. Then 6kV at 300A is 1.8 megawatts. That's enough heat to blind you and set your clothes, exposed skin, and indeed your whole workshop on fire, and the arc would be impossible to stop unless you had a special DC air blast breaker. I think you would end up another of those human fireball statistics like our friend streamers rule.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Say the batteries sag to 6v at their 300A cold cranking rating. Then 6kV at 300A is 1.8 megawatts. That's enough heat to blind you and set your clothes, exposed skin, and indeed your whole workshop on fire, and the arc would be impossible to stop unless you had a special DC air blast breaker. I think you would end up another of those human fireball statistics like our friend streamers rule.
Steve, as the title says this is just what-would-be-if topic and nobody is really going to series thousand car batteries and blow himself off.
But since it is un-doable I dont know is there any point guessing what would really happen (except saying it will be one hell of an arc)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Voltages add up also with internal resistances. You get the same max current as one battery would give but voltages are stacking (up to tremedous level with total 1000 batteries).
Connection resistances are something relative (its not the same if you use one 1mm wire or heavy copper busbars, are batteries tightly lined or far away from each other so connections are long)) so we omit them.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Since we are on the subject of ridiculous ideas, lets say we paralleled up 1 million strings of 1 million 12V 100Ah marine batteries, put it into orbit around uranus, and discharged it into jupiter's second red spot. What would happen then??
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Maybe its time to lock this thread as it obivously doesnt make too much sense, it is said what could be. As EVR says, you cna series milions and then ask what-would-be
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Just wondering..
who made a typo here 
