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Charge while you sleep?
#11
(05-25-2019, 09:53 PM)BlueSwordM Wrote: An internal resistance tester, like an YR1030, a universal battery charger, some TP5100s, and buck converters are what everybody in the forum should start with.
That's enough to do a lot of testing already.

@BlueSwordM,

I applaud your choices esp. the YR1030.

Here is my List if I was stuck on an Island with nothing but a bunch of solar panels and a huge container full of 18650s just floated to the shore.
YR1030, TP5100, (some cell holders) a Boost/Buck converter (and more cell holders) a PS to power the lot. Also some form of capacity tester whether it would be a commercial unit such as an OPUS or similar. I prefer the SKYRC (Expensive) or the Foxnovo (Reasonable). You could also use a ZHIYU® ZB206 or a ZB2L3 for capacity testing.

Quote:The best of the best would be an all included tester with charge current from 0,025A-1,000A, CC discharge up to 1A, internal resistance testing using very low resistance copper alloy springs, etc.
That would be great.
Note: 1,000A not sure what you meant here but that's a lot of A Big Grin


The all in one concept would be the cats a** but for several reasons I don't think it would work.Certainly the charging and discharging can be incorporated into a single operational unit as the switching from charging and discharging can be done using relays whether mechanical or solid state.
The IR measurements are going to be a little more difficult to incorporate as we are dealing with mΩ and any resistance no matter how small will obviously affect the outcome. Could the delta of the resistance of the relays be calculated... absolutely. We actually may not have to do that as the IR sensing wires would be separate from the DC circuitry.  We do have to remember that we still need to adhere to a 4 wire 1kHz AC mΩ reading. So the only delta we need to worry about is the actual resistance of the sensing wires. The normal cell holder used for charging and discharging would not work. We would need a 4 wire cell holder for each cell being tested. For now I think I will stick with the YR1030. Smile

I think in the future I will build a single test unit to incorporate all three measurements. As the IR reading using the 1kHz AC method is separated from the DC charge/discharge voltage and current, it will be interesting to record the IR as a cells voltage changes.
Maybe it can be incorporated into a reasonably priced DIY project.

We will see.

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 6/10/2019
Total Number of Cells                          5940
Cells  >80% of Capacity                      4334
Cells <80% of Capacity                       1605
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2800 +236
For Info Google Drive
Not your average Wolf       
            Cool



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