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Hi from Copenhagen
#1
Hi from Copenhagen.
We had 4kWp of solar panels installed on our city house in 2012. The good thing until now has been that i could "store" my surplus production on the public net for free til later use. Now they have changed the rules so that i have to sell surplus production every hour to buy it back later at 8 times the selling price.
So it is time to build a battery bank.

I have been given a huge amount of Lenovo battery packs with at least 80% capacity. They all have been bought with the same model of lenovo laptop and they all have production date between 11/2013 and 12/2013. Allmost all cells have at least 2000 mAh capacity in my Liitokala LII500.
The distribution looks like:
10% under 2000 mAh
20% between 2000 and 2100 mAh
40% between 2100 and 2200 mAh
20% between 2200 and 2300 mAh
10% over 2300 mAh

The most surprising thing is that the cells within these Lenovo battery packs comes from 4 different manufacturers. That even though all the battery packs have the same model number.
I have LG, Samsung, Sanyo and Panasonic cells from these Lenovo packs


I have harvested about 400 cells up until now - stripped, cleaned, testet and put to storage at 3,72 volts

I would like to build at least 10kWh battery consisting of a 14s100p setup. If i get enough cells I would build a battery for the summerhouse as well.

My current solar setup is 16x260W panels into a Solutronic SP35 1 phase inverter.

My plan is to have a 3 phase inverter that can handle both solarpanels and the batteries as input. I haven't found any yet so any good suggestions are welcome.
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#2
Welcome to the board!
I love your kitchen decor.
The knife is just a prop right? Big Grin

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 70mΩ or less Smile
Last count as of 3/22/2019
Total Number of Cells           3679
Cells  >80% of Capacity        2389
Cells <80% of Capacity         1265
Cells ≥2200mAh & ≥ 80%     1653
Google Drive for info https://drive.google.com/drive/folders/1...sp=sharing
Not your average Wolf       
            Cool



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#3
(03-01-2019, 09:24 PM)Wolf Wrote: Welcome to the board!
I love your kitchen decor.
The knife is just a prop right? Big Grin

Wolf

The decor is solely the wifes work.
I use the knife to pop the "lid" of the Lenovo batteries.
4 kWp solar and a lot of Lenovo batteries
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#4
(03-01-2019, 09:05 PM)Jensk Wrote: The most surprising thing is that the cells within these Lenovo battery packs comes from 4 different manufacturers. That even though all the battery packs have the same model number.
I have LG, Samsung, Sanyo and Panasonic cells from these.

I've seen the same thing with Dell packs. Sometimes an obvious "Cell Made in Japan" will clue you into Sanyo or Panasonic, while "Cell Made in Korea" will tell you LG or Samsung. And even between those, there will be a subtle, but distinct difference between the packs containing LG vs the ones containing Samsung. If you open enough of the same pack, you will start to figure out the trend.
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#5
Green cells? Samsung 22F? and pink cells 26J or 26H? just curious Smile
Best of luck with stripping.

chrisD
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#6
Green cells are samsung 22F
Pink cells are 26H
4 kWp solar and a lot of Lenovo batteries
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