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Old 06-12-2010, 03:46 PM   #1
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Default amp draw vs welding amps

Ok guys.. ''Roady''..Please explain.... If I build a lithium battery pack with a 60 amp tig weld machine to connect the cells to each other & now the pack can produce just over 1400 amp draw for 14 seconds.. What will this do to the weld of the lithium battery calls??? I hope I did not loose you on this one.... Will the 60 amp welds hold??/ Are is this a stupid question...
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Old 06-13-2010, 09:39 AM   #2
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Default Re: amp draw vs welding amps

GB, are you welding the batteries together or are they bolted connections, or are you building tabs to bolt the batteries together. Need more info. But, if you are building some tab/lug connections to bolt the batteries together then the amps used to weld the tabs together has no affect on the amps that will be traveling through it, the only affect the amps traveling through the tabs will be the thickness of the tabs handling the amps. Too thin = melt down. We see melt down a the Power Plant quite often in Switchgears not making a quick positive connection.
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Old 06-13-2010, 09:39 AM   #3
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Default Re: amp draw vs welding amps

what size are the straps between each cell
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Old 06-13-2010, 11:23 AM   #4
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Default Re: amp draw vs welding amps

Quote:
Originally Posted by rifter View Post
GB, are you welding the batteries together or are they bolted connections, or are you building tabs to bolt the batteries together. Need more info. But, if you are building some tab/lug connections to bolt the batteries together then the amps used to weld the tabs together has no affect on the amps that will be traveling through it, the only affect the amps traveling through the tabs will be the thickness of the tabs handling the amps. Too thin = melt down. We see melt down a the Power Plant quite often in Switchgears not making a quick positive connection.
Thanks a lot Rifter,

Red 22. The Tabs are close to .060 thick...



I'm adding two more 36-volt packs too the packs I have now.. But the original battery pack went thru a controller & the amp draw was set at Max 550 amp. My new controller has no amp restriction on it.. A123 batteries.. Say my total pack can now handle 1400 amps.. That is a very big one time hit on the battery back.. I am just trying track down possible problems and eliminate them.. Thanks guys
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Old 06-13-2010, 12:13 PM   #5
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Default Re: amp draw vs welding amps

GB, i would double up all of the connections and be sure you wont burn any out.

it would not take much more time to do and a few dollars in straps.

and what kind of controller did you get? the zilla
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Old 06-13-2010, 06:35 PM   #6
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Default Re: amp draw vs welding amps

GB, what the heck is that??? All those little gas cans, you can use 1 bigger gas can to do the same job LOL.
.060 is not very thick, by the time all that juice makes it around to the discharge point things are going to be HOT, I would change out all the aluminum for copper and at least go with .125, but I don't know what you have there,,a bucket load of batteries that's for sure, kinda look like capacitors?
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Old 06-13-2010, 07:17 PM   #7
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Default Re: amp draw vs welding amps

Rifter, That is one 36-volt lithium Ion battery pack.. 30 lbs..
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Old 06-14-2010, 08:53 AM   #8
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Default Re: amp draw vs welding amps

http://www.texaselectricbikes.com/ca...our-p-165.html
GB is this something like what you use?
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Old 06-14-2010, 10:21 PM   #9
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Default Re: amp draw vs welding amps

Quote:
Originally Posted by rifter View Post
GB, what the heck is that??? All those little gas cans, you can use 1 bigger gas can to do the same job LOL.
.060 is not very thick, by the time all that juice makes it around to the discharge point things are going to be HOT, I would change out all the aluminum for copper and at least go with .125, but I don't know what you have there,,a bucket load of batteries that's for sure, kinda look like capacitors?
That's a thought! Use one battery pack to charge a very large capacitor group, then discharge it through the motor for a splendid hole-shot, at the same time energize the second battery pack to take over!
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Old 06-15-2010, 07:28 AM   #10
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Default Re: amp draw vs welding amps

e-z-go1988 WOW!! can you do that!
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