mangogrooveworkshop
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| posted on 24/4/12 at 06:18 AM |
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Do you take battery safety seriously
This is a picture of 2 batterys I have had to replace.
One gassed and ready to pop and one that has gone.
You would not want to be anywhere near the dam thing in this state.
The energy in fault current out of a simple car battery is huge under short circuit conditions be careful 
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snowy2
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| posted on 24/4/12 at 06:35 AM |
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it never ceases to amaze me that folks will spend thousands on building a car (thousands on just the engine) then wire the car with left over wire
from the house extension that the wife demanded as the price for your new hobby, then they wonder why nothing works as it should.....
Car battery's can deliver 1000A+ in a short circuit situation and make very short work of your loom. it is extremely easy to rewire a kit car,
you dont even have to sacrifice any chickens!! the battery's above show how it can go all wrong.
sometimes you are the pigeon, most of the time the statue.
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MakeEverything
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| posted on 24/4/12 at 07:07 AM |
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I've seen generator batteries overcharged or exploded all the time. Most recentLy, I had to send out a technical bulletin internally to make
our staff aware of the dangers. The issue isn't so much with the short circuit fault current, it's with the force of the explosion and
the gases which are flammable.
Most recent one I've seen in St Albans, the battery had blown its top off, and shattered a 1/2" ply timber box sitting over it.
The most common cause? Low electrolyte.
[Edited on 24-4-12 by MakeEverything]
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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mangogrooveworkshop
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| posted on 24/4/12 at 07:29 AM |
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Ive got more pics that have similar results........
I have a bigger respect for dc than AC......
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iank
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| posted on 24/4/12 at 07:42 AM |
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quote:
Originally posted by mangogrooveworkshop
I have a bigger respect for dc than AC......
Agreed DC of the same magnitude is much more dangerous than AC.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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liam.mccaffrey
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| posted on 24/4/12 at 07:52 AM |
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This is like the tesla Edison ac dc debate of the late 19 th century. Which is more dangerous etc.
Very interesting chap tesla was, "the man who invented the 20th century" is a cracking read all about him.
Build Blog
Build Photo Album
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SeaBass
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| posted on 24/4/12 at 08:06 AM |
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Two seperate failure distinctions to make - not to mention the acid itself.
Mango - those batteries should have been vented to prevent a failure like that?
Makey - look like a hydrogen explosion to do that kind of damage. eg Hydrogen ignited by heat from low electrolyte.
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Dick Axtell
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| posted on 24/4/12 at 08:26 AM |
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Loom protection - Why not use a fusible link? Never had to try one in action, but installed a Ford item just as a precaution.
Work-in-Progress: Changed to Zetec + T9. Still trying!!
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mangogrooveworkshop
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| posted on 24/4/12 at 10:47 AM |
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In our case battery pack was installed on its side and the thermo was unplugged
They are a problem because of a design fault created before my time at design stage.
We only deal with the issues as they fail.
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pewe
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| posted on 24/4/12 at 11:44 AM |
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When I were a lad we used to "test" customer's flat batteries by putting a bit of weld wire across the terminals.
One time the battery was far from dead and the weld wire fused itself into my skin!
Needless to say we started using the proper equipment after that.
Cheers, Pewe10 
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big-vee-twin
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| posted on 24/4/12 at 12:08 PM |
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Tesla one of my all time heros alongside IKB.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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MikeRJ
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| posted on 24/4/12 at 01:30 PM |
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quote:
Originally posted by iank
quote:
Originally posted by mangogrooveworkshop
I have a bigger respect for dc than AC......
Agreed DC of the same magnitude is much more dangerous than AC.
There really isn't much in it. Both are quite capable of killing you at high voltages and both are equally capable of starting fires under
fault conditions.
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mangogrooveworkshop
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| posted on 24/4/12 at 02:01 PM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by iank
quote:
Originally posted by mangogrooveworkshop
I have a bigger respect for dc than AC......
Agreed DC of the same magnitude is much more dangerous than AC.
There really isn't much in it. Both are quite capable of killing you at high voltages and both are equally capable of starting fires under
fault conditions.
AC I can isolate it switch it off and deal with it that way .......DC battery packs I can do sod all with.
They are live and thats it .....put them in a four series chain and take 48v+
and you have a mean amount of energy available.
Most batterys cant be placed on their sides........dont believe what the manufactures rep says......
he knows it shortens the life and he can sell you another battery.........
or as I found lots of DEAD cell blocks.
[Edited on 24-4-12 by mangogrooveworkshop]
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jeffw
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| posted on 24/4/12 at 03:10 PM |
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Diesel/Electric submarines will teach you everything you want to know about battery safety. Like lead-acid + Salt Water = Chlorine gas....nasty in a
sealed environment.
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mangogrooveworkshop
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| posted on 24/4/12 at 05:30 PM |
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quote:
Originally posted by jeffw
Diesel/Electric submarines will teach you everything you want to know about battery safety. Like lead-acid + Salt Water = Chlorine gas....nasty in a
sealed environment.
I once had a lad that was at college with me was ex sub man....he was mad as a hatter a real strange fella . Think he spent to long in the reactor
room....
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iank
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| posted on 24/4/12 at 06:28 PM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by iank
quote:
Originally posted by mangogrooveworkshop
I have a bigger respect for dc than AC......
Agreed DC of the same magnitude is much more dangerous than AC.
There really isn't much in it. Both are quite capable of killing you at high voltages and both are equally capable of starting fires under
fault conditions.
AC will usually throw you off, DC will often cause you to grip on and continue shocking you. At least that was the view of the lecturer when I did
the analogue electronics module at uni.
But agreed once you get above a certain voltage you'll just get smoked by either.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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snowy2
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| posted on 24/4/12 at 08:31 PM |
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there is enough power in a watch battery to kill you, its not volts it amps that is the problem, if it were every time we got a shock shuffling across
the floor we would kill our selves, a vacuum cleaner is about 1000w or 3-4 A and it will hurt if you get a shock but your starter motor is also about
1000w but a shock from close to 100A (and up to 1000A) is going to give you a real problem.
[Edited on 24/4/12 by snowy2]
sometimes you are the pigeon, most of the time the statue.
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speedview
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| posted on 30/4/12 at 08:14 PM |
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Battery goes bang as you're leaning over the engine bay; acid in eyes; trip over tools/junk as you jump back; crack head on floor and knock
yourself out; come to blind for the rest of your life.
Jaguar X300s (6cyl) and X308s (8cyl) have nice dual-output fusible link holders in the boot. (one for the starter with 2x 250A fuses; one for
everything else with a single 250A fuse) and are common in scrappers. Convenient for isolation of batteries where the terminals are difficult to get
to too, and more reliable than the cheapo battery cut-off switches. (I've had three in my time, and all three have failed. One dead short, one
high resistance and fire, one high resistance and luckily wouldn't crank so didn't catch fire. Eurgh!
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