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My little bike shed
#1
Hi all,

A short introduction of my DIY Powerwall project, made in the Netherlands.

Inspired by the Glubux project I started collecting 18650 cells. Now I have enough cells for a 14S120P setup, all balanced and ready for creating the 14 packs. I'm gonna use the Victron Multiplus II 48/5000 in combination with my already installed SolarEdge installation with 44 panels of 280Wh each. The installation will be placed outside of the house inside a closed off section of a bike shed. 


My workbench 


Balancing and (re)testing used Panasonic NCR18650A cells


Panasonic NCR18650PF cells where a bit too narrow for the cell holders I bought, so I gave them an extra sleeve.


Hmmm, my opus charger & tester is a bit optimistic I think

 
The 14 packs are almost ready for soldering

Friendly greetings,
Emiel
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#2
(06-06-2019, 02:33 PM)Emiel Wrote: Hi all,


Hmmm, my opus charger & tester is a bit optimistic I think

Friendly greetings,
Emiel
Emiel,
Welcome to the forum!!
Looking good and looking forward to your completed build.

A far as the OPUS and the NCR18650A cells is concerned the results are not that bad on a 3000mAh cell. You are between .87% to 5.27% high.
Typical capacity is actually 3070mAh so that would lower the inflation a little.  
Don't take this as a defence of the OPUS just an observation.

It would be interesting to know the 'true" IR of these cells (not the OPUS fake quick test).
These are some of my results for the few (48) NCR18650As that I have. The LiitoKala I know is off by at least 5% to the high side.
I'd be very happy if I had 1000 of those cells optimistic or not.


The only thing that confuses me is you have a lot of green cells yet all your packs have pink generic ICR 18650 2600mAh wrappers Huh
Did you resleeve all of them?

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                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
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#3
It's a "Blue Peter" setup (only older UK people will get this)...... "and heres one I prepared earlier"
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
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#4
... and where is the little bike ?
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#5
(06-06-2019, 03:46 PM)Wolf Wrote: It would be interesting to know the 'true" IR of these cells (not the OPUS fake quick test).

I only have an Opus to check the IR, I did get readings on the Opus of 50 mOhm on average.

(06-06-2019, 03:46 PM)Wolf Wrote: The only thing that confuses me is you have a lot of green cells yet all your packs have pink generic ICR 18650 2600mAh wrappers Huh
Did you resleeve all of them?

Besides the Panasonic NCR18650A and NCR18650PF cells I have about 600 new cells of unknown origin. I did remove the sleeve on one of the cells but these cells do not have any marking on the cell itself. I have tested several of this batch of cells and on my Opus and they are rated between 2900 and 3100 mAh.
One cell I'm testing on the Ultramat charger, charging at 8A and discharging at 5A. And still the capacity stays the same, so I have the impression these are cells are good enough for my power wall. Time will tell...





The cells look btw very similar to the Jehu Garcia Re-volt cells. Who knows... maybe they are from the same manufacturer.

https://www.youtube.com/watch?v=WvYlfZCOacE

Emiel
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#6
Got it 
Labeled 2600mAh and give ~3000mAh result.
Very interesting. Good for you though.
Happy building.
PS if you have a scale it would be interesting to see the gram weight of these.

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                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
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#7
(06-07-2019, 06:09 PM)Wolf Wrote: PS if you have a scale it would be interesting to see the gram weight of these.

47 grams per cell, even 1 gram more compared to the Panasonic cells.



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#8
The only thing I would complain about is truth in advertising.
2600mAh rating 3000mAh results. Shees the nerve of them!!

Wolf
Korishan and OffGridInTheCity like this post
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                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
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#9
Today I tested the new hydraulic crimping tool together with 35mm2 cable and PP120 Power Pole connectors.

The connectors will be used to connect the 14 packs of my 14s120p setup. These are not genuine Anderson Power Pole connectors but they are very solid and make a satisfying click when you connect two connectors to each other. 

I bought them from AliExpress:
https://www.aliexpress.com/item/33024161419.html






The sizes of the crimping tool are a bit off. To make a good crimp I first crimp with size 35 and then a second crimp with size 25 and then it's a really good crimp.


The contacts are large enough to make two crimps next to each other.


Heat shrink with glue





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