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High and low drain cells mixed
#11
Very cool. Would be interesting to see the Voltages overlayed with the Current.
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#12
(08-22-2019, 12:31 PM)jdeadman Wrote: Very cool.  Would be interesting to see the Voltages overlayed with the Current.
Your wish is my command 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                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
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Not your average Wolf       
            Cool
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#13
Huh I would have expected a bigger difference in the Voltage drop when there was a difference in current. Interesting But still very cool
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#14
(08-22-2019, 02:09 PM)jdeadman Wrote: Huh    I would have expected a bigger difference in the Voltage drop when there was a difference in current.    Interesting  But still very cool
jdeadman,
You have to remember the cells are all on a common buss so each cell influences the other and voltage is the common denominator. 
The Amp draw is the same no matter what so each cell gives up what it can at that voltage.
It just shows that the 2 low IR cells and the 2 high IR cells work together in unison
Again this is a parallel test not an individual cell test.

Note: You can always look at these tests as they are happening. http://wolftech.mynetgear.com:4562/d/gsj...refresh=5s

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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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#15
(08-22-2019, 02:27 PM)Wolf Wrote: It just shows that the 2 low IR cells and the 2 high IR cells work together in unison
Again this is a parallel test not an individual cell test.
This makes me think that IF you are going to mix IR in a pack - its better to do it 50/50 rather than 2/100.    Because if you do 2/100 - then 2 of the cells are going to be really stressed (relative to the overwhelming 98) as they are a very small minority.     In other words, in my case, distributing 13 MOLIs with 107 Panasonics per pack might cause the 13 MOLIs to stress out more rapidly as the 107 Panasonics weigh heavily in the pack?

Does this make any sense?
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#16
Thing is that the cells getting a "bot more" stressed will most likely wear out and in the end get closer to the other cells in IR and such. This will result in more even packs over time. This of course demands that you have randomized your packs and keept them within reasonable ranges.

Perhaps I should not have said this so early in this test Tongue
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#17
(08-22-2019, 03:24 PM)OffGridInTheCity Wrote: This makes me think that IF you are going to mix IR in a pack - its better to do it 50/50 rather than 2/100.    Because if you do 2/100 - then 2 of the cells are going to be really stressed (relative to the overwhelming 98) as they are a very small minority.     In other words, in my case, distributing 13 MOLIs with 107 Panasonics per pack might cause the 13 MOLIs to stress out more rapidly as the 107 Panasonics weigh heavily in the pack?

Does this make any sense?
Makes absolute sense to me. But more testing is required.
Man will I ever get to build my powerwall Tongue

The 1 Amp discharge per 4p is coming up to 6 hrs and the chart is looking interesting. I am very curious to see what happens at the end when the cells will show their final gasp at 3.0V.

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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#18
Now that's Neat. But only time will tell over many cycles to see of there is any effect to different cells. But Wolf, Big thanks for taking this on and testing.
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#19
(08-22-2019, 06:40 PM)jdeadman Wrote: Now that's Neat.  But only time will tell over many cycles to see of there is any effect to different cells.    But Wolf,  Big thanks for taking this on and testing.

Yes unfortunately determining what happens with many cycles that is the problem. My 4 cell charge/discharge analyzer can really only give us a representation of what is happening with the interaction of these cells. 
But it does give us a good representation of what happens when you mix high and low IR cells.

Didn't know that these cells are artists in their own right what an interesting and pretty picture they paint. Took them from 5:56 AM to 3:39 PM 9 hrs and 43 min to complete. Here is the graph of these 4 cells.

Cell#1   1 INR18650-25R  14.8  4.1721  2527
Cell#2   2 INR18650-25R  14.0  4.1778  2522
Cell#3   7130 UR18650FM  42.1  4.1770  2573
Cell#4   7132 UR18650FM  41.7  4.1798  2562
1 Amp Discharge for the pack
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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#20
Wow Crazy. Interesting back and forth depending on DoD Wild difference in current at 12:00
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