Beginners Guide to Processing 18650 Cells | Cell Database


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Glubux's Powerwall
#21
Thanks for the update.

To balance the packs, did you consider getting them all fairly close - then connect them all up in parallel overnight ?

This method is a lot quicker than using your charger, and won't cost you any energy as the process simply shares what's already stored.
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#22
   

That's how I do it , no charger Wink
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#23
Ah, seeing different voltages on your meters made me think you'd got a charger out of shot - the actual voltage across each cell (when in parallel) will be identical - so you can now see the errors in those meters.
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#24
Sean Wrote:Thanks for the update.

To balance the packs, did you consider getting them all fairly close - then connect them all up in parallel overnight ?

This method is a lot quicker than using your charger, and won't cost you any energy as the process simply shares what's already stored.

As has been shown many times, this method does not work.
For it to work, charge voltage and rest voltage would need to be the same. They are not. Charge voltage is always higher than rest voltage. Secondly, it would require 100% charge efficiency, which is impossible.
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#25
It works perfectly well - its how commercial bank producers have been doing it for decades - its how folks living off grid have been doing it for decades.

Feel free to convince me that it doesn't.
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#26
Update :

The packs are doing their job pretty well.
I received my balancers:
   

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They are a bit expensive, about 20€ per pack, I don't really know how they work (they share some 4.3V AC) but I like the fact that they don't bleed the highest pack but transfert the energy to the lowest.
They seems to work pretty well, keeping the difference of 0,05v max no matter the state of charge:
   

This is still a bit ghetto style but it's enough for testing
owitte, Chris Evans, zag2me And 1 others like this post
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#27
Hi Glubux,

I really do like you work!
Do you have also lead acid battieries (on the right side)?
Do you use lithium and lead acid in parallel? If yes how do you do it?

BigBen
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#28
BigBen Wrote:Hi Glubux,

I really do like you work!
Do you have also lead acid battieries (on the right side)?
Do you use lithium and lead acid in parallel? If yes how do you do it?

BigBen

Hi Big Ben, thank you Wink

Those are my old forklift batteries, I keep them for now as a backup (and mostly because they're super heavy) but they are not connected.
As soon as my bigger packs will be running, I'll get rid of them.
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#29
What's scrap value like over there Simon ?
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#30
I have no Idea, some french website says around 1€ per kg but I thing it is for pure lead.
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