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Another DIY Powerwall in Germany (15 kWh)
#21
Always a good day when you get more cells Big Grin
I would be interested in the capacity those Samsung ICR18650-22FM have.
They should be very similar to the ICR18650-22PM That 95% of my build will be made of, and I might have access to some of those 22FM cells, curious if I can mix them.
Do you note down from what e-bike batteries you get what type of and brand of cells?
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#22
This will probably be one of the last packs which I'm going to disassemble as it's totally glued together Sad
But sure, I will report once I get there Smile

Currently I have already measured 90 cells and very happy: ~ 40 Samsung 29E with still 2900 - 3000 mAh, 20 Panasonic CGR18650CF with ~ 2000 mAh and 20 Panasonic NCR18650 with ~ 2900 mAh and 10 Panasonic CGR18650CG with ~ 2300 mAh. Average is currently 2615 mAh Big Grin

Only 6 bad cells so far...
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#23
You could see if there's anything that would dissolve the glue.
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#24
Most of the time the packs are glued together with ordinary hot glue which perfectly melts together with the heat shrink wrapping. In rare cases, you can just peel it of (probably if the glue was not hot enough to melt the heat shring wrapping) but usually the wrapping also disintegrates. I think trying to dissolve the glue will also dissolve the wrapping.
So I think destroying the wrapping + rewrapping is the best method Smile
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#25
(07-09-2017, 10:19 AM)The-J-Man Wrote: Always a good day when you get more cells Big Grin
I would be interested in the capacity those Samsung ICR18650-22FM have.
They should be very similar to the ICR18650-22PM That 95% of my build will be made of, and I might have access to some of those 22FM cells, curious if I can mix them.
Do you note down from what e-bike batteries you get what type of and brand of cells?

Hi!

Although a real pain to disassemble, the whole pack seems fine and the Samsung ICR18650-22FM still have ~2200 mAh left.


best regards,
Alex
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#26
(07-16-2017, 06:06 AM)Chicken Wrote: Hi!

Although a real pain to disassemble, the whole pack seems fine and the Samsung ICR18650-22FM still have ~2200 mAh left.


best regards,
Alex

Pretty good results. The max the OPUS would show on a new cell like that is about 2400mAh. So you are looking at about 2000mAh real capacity or cells with 95% of the original capacity from 1A discharge test. 
2240 is essentially the average of what I was getting on the OPUS for all of my 1560 cells of type ICR18650-22PM. 
So yeah thats a pretty good pack you had there.
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#27
I wouldnt say its 20% below the real capacity. It depends on so many factors. I have seen it very very close on some cells and way off on others compare to for instance my iCharger. It all depends on what you compare to and what datasheet you go after. Its different ways of testing Smile
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#28
Hi!

Powerwall running perfeclty so far. No grid usage since it went online on July 1st. It can now be monitored online Smile
https://emoncms.org/Chicken

best regards,
Alex
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#29
Neat interface Smile Though, it's not in english, i can get the jist of what's what 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)
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#30
Hi!

Next cell delivery. Somewhere around 600. Mostly Samsung 22P, 22F and Sony US18650V



regards,
Alex
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