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J-Mans project
#21
(05-21-2017, 06:00 PM)jdeadman Wrote: Bummer. Yea I used multi strand house wire that I saw a few guys using.   Working well so far.    But I just killed my charge controller so I need a new one

Sounds good.
Damn, how did you do that?
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#22
Took 3 strands and put them in a vice. Then the other end of those strands into the chuck of a drill, while holding pressure to keep the wires straight pulled the trigger on slow speed for about 10 seconds
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#23
I think JMan was referring to how you blew your charge controller Tongue
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#24
Lol. Not sure actually. I was charging the pack with an RC charger. There was no input on the controller​ just as a pack voltage monitor. And all of a sudden my laptop went pop and my router reset (and now is not working properly) and the charge controller​ is dead. It was weird
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#25
Sounds to me like you had a power spike, then. Or another device went nuts and popped stuff. Sucks either way Sad
2146 likes this post
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)

Kickstarter: Honest STM32F103 based dev Boards
Patreon: Korishan
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#26
Yea. Good thing the controller was a cheap one. Going to be looking for a new one soon.
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#27
ha, damn that was unfortunate Tongue Try returning it Wink
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#28
50m of 5stranded earth cable and 900 cells tested.


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#29
PROGRESS! First pack soldered and Charging! Busbar is 5 strands of 2.5mm2 Should be ok for 120A from what I've learnt here Wink I will be doing 7 strands on the finals I think so there is less voltage drop.

still cant figure out why my solder doesnt flow like your guys's does  Angry  If I like superheat my busbar then it flows better but im worried Im damaging the cells that way...?
Therefore its not super pretty at the moment but it does seem to work.

Just a test pack, still haven't decided on completely on how to build my packs as i haven't chosen hardware yet...

Pack voltage is 3.5 at the moment, iMax is reading 3.75. Normal?


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#30
Looks good.
You can heat your bus bar pretty hot if need be. Its not transferring heat to the cells like you'd have if you're directly on the cells.
Make sure you have plenty of flux. It's possible your solder you are using isn't flowing the flux fully.
It's possible your multimeter isn't fully calibrated, or the iMax isn't. If you can get another MM to test to the voltage, that could help you zero in the true voltages.

Some MM's have an adjustment resistor inside to fine tune the voltages.

You could name your build the Purple Power Eater Tongue
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)

Kickstarter: Honest STM32F103 based dev Boards
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