Begginers Guide to Processing 18650 Cells | Cell Database


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Charging station complete
#1
Big Grin 
 

I'm really excited that my parts came in and finally assembled my charging station 
Not 100% sure if I wired it right (I tried to go for one tp4056 to charge two 18650 cells) so 500mah each
Does this also mean if I remove one cell that reminding cell charges at 1ah?

Now to charge my cells and check capacity
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#2
One module charging one cell is the way to go.
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#3
1:1 i would also agree with, if one cell is a higher capacity than the other, it will take the majority of the current, and it ends up taking just as long to charge as 1:1
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#4
Well

Looks like I need to rewire some stuff
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#5
I see nothing wrong with your setup. I charge mine at about 0.625A (5A in to a 8P board) prior to capacity testing. Once they're fully charged, I stick them in the capacity tester tops them off to 4.22v and starts the discharge test. Precharging them like this makes the testing process go much faster. I assume you're sticking yours in a capacity tester once you finish charging them with the above setup and doing the same thing?
Solar Setup: 9x 320w panels, PCM60X charge controller
Battery Setup: 14x 120 cell 18650 packs, 48v configuration

Recommended Items:
Opus BT-C3100, Cell Heat Shrink, 4-Cell Holders
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#6
(02-04-2017, 01:28 PM)mike Wrote: I see nothing wrong with your setup. 

What happens when a flat/dud/shorted cell is mated with a good cell that's still holding a decent level of charge ?
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#7
(02-04-2017, 01:40 PM)Sean Wrote:
(02-04-2017, 01:28 PM)mike Wrote: I see nothing wrong with your setup. 

What happens when a flat/dud/shorted cell is mated with a good cell that's still holding a decent level of charge ?

I guess I should have clarified. I check all of my cells with a voltmeter prior to sticking in. Nothing lower than 1.5v goes in. Ones that are 0.5-1.49 are charged separately and 0.49v and less are binned.
Solar Setup: 9x 320w panels, PCM60X charge controller
Battery Setup: 14x 120 cell 18650 packs, 48v configuration

Recommended Items:
Opus BT-C3100, Cell Heat Shrink, 4-Cell Holders
Reply
#8
Well I plan to just waiting for those to arrive in the mail
I'm following jehu Gracia and I'm his videos he sets aside cells after a charge to allow for a small time to self discharge
Then take the remaining cells that still have a good charge to use in a bank

So quick question
If I put a cell that's 2v and another that's 3v does the 3v cell get overcharged?
Or is it evenly charged?
Also my multimeter doesn't check current so I'm unsure if it's actually 500mah each cell
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#9
(02-04-2017, 07:13 PM)FireFrog Wrote: If I put a cell that's 2v and another that's 3v does the 3v cell get overcharged?
Or is it evenly charged?

The 3V cell will attempt to instantly charge the 2V cell so the voltages are the same.
For technical reasons it won't be instant, but high currents will be involved.
This is bad because:
1) You drain the 3V cell to far.
2) You want to charge the 2V cell slowly so as to not cause damage.
3) Both cells could get hot.
hbpowerwall and Sean like this post
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#10
(02-04-2017, 07:56 PM)station240 Wrote:
(02-04-2017, 07:13 PM)FireFrog Wrote: If I put a cell that's 2v and another that's 3v does the 3v cell get overcharged?
Or is it evenly charged?

The 3V cell will attempt to instantly charge the 2V cell so the voltages are the same.
For technical reasons it won't be instant, but high currents will be involved.
This is bad because:
1) You drain the 3V cell to far.
2) You want to charge the 2V cell slowly so as to not cause damage.
3) Both cells could get hot.

They balance each other out. I don't think it's really a concern. Like I said above, I precharge 8 cells at once per charger. I throw in 1.5v and 3.9v together all the time. I have charged thousands and none get hot (Sanyos aside) or blow up.
Solar Setup: 9x 320w panels, PCM60X charge controller
Battery Setup: 14x 120 cell 18650 packs, 48v configuration

Recommended Items:
Opus BT-C3100, Cell Heat Shrink, 4-Cell Holders
Reply


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