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The Powershed
(12-15-2018, 02:21 PM)howardrya Wrote: The supply of packs has slowed down around the holidays, so I've been occupying myself with some other stuff. I did some testing with my imax b6 mini and generated these discharge curves. The data was logged with "DataExplorer" which is a really cool program to log all the info your pc connected charger outputs, I highly recommend you check it out. 

As an Engineer, I got really curious about the health of these cells. These curves are for the two most common cells in my packs, the Samsung 28A and the LGABC Cell at 1 amp and 0.5 amps. Both cells are around 5 years old from old laptop packs. The cells were the same for both the 1 amp and 0.5 amp tests. These cells were capacity tested by my bank of opus chargers once. I've heard frequently that the opus chargers tend to overestimate the capacity, but I saw the opposite in my further tests. My guess is that the capacity increased with recharges as is was "waking up" the cell from sitting for so long. 

Original Opus Readings - 
LGABC - 2356 mAH
28A - 2252 mAH

I'm curious about your thoughts on this too.
If i have done my homework (on peter keil's degree thesis) well, the light blue curve at the low end reveals some wear on the cathode side of the cell.

And i would love if you can supply IR values for both as well.
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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