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after harvest: testing, how?
#1
Good day to all,

I've done some good reading around this million dollar site.
Went back 7-8 months in time!

I came up with the following, feel free to correct or supplement where you think it might be necessary.
I want to do this from cell one properly, please.

We have some cells after harvest, we don't know nothing about them, no soc soh ect.

#0: write down the original mah on the cell
#1: charge them to 4.2 volt, with 500mah, check for heaters
#2: we leave them for one week minimal, i am set for two weeks.
#3 check volt drop if its more then 0.3v: start over to wake up or bin?
#4 discharge to 3.5v to let the tp charge it again to 4.2v(1ah) exactly, check for heaters.
#5 testing the discharge according to fabric specifications(v and mah). Write the outcome down on the cell
#6 charge to 3.5v for storage(in my case charge to 4.2 and than discharge to 3.5).

My powerwall will work with less than 500mah per cell, and in between 3 and 4 volt, no more no less, i think.

I am going to use some tc and tp 4056 and the zb2l3 in my setup.
I understand that the voltage out on the tp must be checked if the are the same( to "pair" them), I will order a 30 pieces and find ten that are exactly the same in volt output, for the capacity test.
Now the zb2l3 can be calibrated, if you have some equipment for it, I dont have those kind of lab stuff, sorry for me.
But there was a way to "pair" them with a condensator/capacitor, how do you do that?

The cells that wont charge, they will get a manually charge to 3,3 volts
I am planning to use a power supply from a computer.
I also have in possession some really heavy power supply's that can be regulated between 4 and 6 volt, or just stick with the power supply from a computer?
I hope i am on the right track now, i really want to get started, more and more battery's are flying in.

Got some if not a lot of questions and i hope to see some answers hints and tricks for this trade.
Let me hear your thoughts on this

Thanks in advance!
Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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#2
You charge with mA/A (Current). mAh/Ah is capacity

I test like this:

The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#3
Howy.....sorry for that goofup....Currant and capacity, i will pay more attention, thanks!

I downloaded this chart two weeks ago, this was/is my point to ask questions.
And to start to build a charger/discharger/tester, to do it good for those cells

Because it makes a lot of sense, but i want to learn more, not only how to do it but also why.
And man...you got a lot of posts to read....that alone will keep me busy for a month or two.
Witch i dont mind!

Best and thanks in advance
Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
Reply
#4
Smile

The chart I made above is just based on one of the simpliest ways doing it with the ready made testers out there. You can optimize it more but this system is based on changing cells 2x day and works good for many.

The reasons you do certain steps have been answered many times and if you have specific questions let us know and we will for sure answer!
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
Reply
#5
Thanks daromer,
So i am on the right track.
I am starting to understand some things and there why.
Let's tweak the process furthermore.

Wolf's info is also great.

If i have specific questions i will surely ask, thanks in advance
Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
Reply
#6
(03-14-2019, 01:12 PM)100kwh-hunter Wrote: Thanks daromer,
So i am on the right track.
I am starting to understand some things and there why.
Let's tweak the process furthermore.

Wolf's info is also great.

If i have specific questions i will surely ask, thanks in advance
100kWh
Ah that Wolf guy again. Don't believe anything from him all he does is post facts that he has recorded. Oh wait that me. Tongue
Now Daromer has the good info. Big Grin

Now to the facts.
So I have a bunch of ICR18650-30B cells and from the initial IR readings I knew that they were not going to perform. (IR measurement IS the initial time saving step) this info is to  ("to keep with the thread subject of after harvest: testing, how?" ) So I ran them through my testers anyway just to prove a point. Number 1 point it was a waste of time to do anything with these cells and number 2 point is it was a waste of time. The only good thing was that it builds the database with more valuable IR measurements.
Now remember IR can only be accurately measured according to the manufacturer with the 4 wire kelvin methode at 1kHz AC.
I can definitely say that if the IR of an ICR18650-30B is above 50mΩ it will most likely be a low mAh performer compared to its 2950mAh rating. My lowest IR cell of the ICR18650-30B is 55.4mΩ and it barely scratches 80% (76.92%) of capacity.There are some exceptions but very few.


Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6106
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2694
For Info Google Drive
Not your average Wolf       
            Cool
Reply
#7
(03-14-2019, 02:01 PM)......snip...... Wrote: (IR measurement IS the initial time saving step) ......
....snip .....
Wolf

Musik in my eyes.... Big Grin
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
Reply
#8
It is only a timesaver for those that is going to bin all low value cells. Most People here want to use Them for 2nd type projects.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
Reply
#9
(03-14-2019, 04:07 PM)daromer Wrote: It is only a timesaver for those that is going to bin all low value cells. Most People here want to use Them for 2nd type projects.
This is from a guy that spends 10 seconds on each cell no more Tongue
Quote:You know me. I would not spend more time than needed during a test phase since 10 seconds per cell or even 3 minutes extra time would in the end result in days for me....... link

That is why when I get another ~1000 or so I will advertise and give them away. Big Grin

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6106
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2694
For Info Google Drive
Not your average Wolf       
            Cool
Reply
#10
(03-14-2019, 04:07 PM)daromer Wrote: It is only a timesaver for those that is going to bin all low value cells. Most People here want to use Them for 2nd type projects.

C'mon, dont spoil the fun for me... Big Grin


[quote pid='47363' dateline='1552579997']
That is why when I get another ~1000 or so I will advertise and give them away. Big Grin

Wolf
[/quote]

me ! Me!
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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