Capacity Testing Station

Joined
Oct 21, 2017
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43
Hi There

So jumping on the back of a previous post I'm currently going through the painful process of charging and discharging my ever growing stock of batteries. Im about 300 cells into my 1500 cell stock at current. I may have just secured 1500 more which means im going to be doing this for years with my current setup of 1x Accupower Charger IQ 328 + V2. Yes its not an Opus, cant find any in the UK :(

So I have a handful of 255w power supplies from Dell PC's which I've salvaged, DC out 12VA at 14A, 12VB at 13A and VSB 1.67A. I've seen some interesting designs and just looking for some advice about building a 20 x Capacity Tester to speed this up!

In an attempt to be DIY and save monies well hopefully could using these be a good plan:


TooGooCapacity Meter

or this

BlueLover Capacity Meter

Both have dodgy names! haha

I am going to start with 8 and grow the Station each month as pay day comes in ;)

Is there any other Capacity Meters you guys have seen that you would say get this? Or is it a case that these are probably all out the same factory say in china?

Also how many cellsper PSU would you recommend? Im thinking join the 12VA, 12VB, and 12VSB together and have 8 cells/capacity testers pulling 8A? Sound about right?

Cheers Guys!
 

Korishan

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Jan 7, 2017
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Well, if I'm not mistaken, the 12VA and 12VB are not the same. One is +12V, the other is -12V. So, I wouldn't go connecting them together on the PSU. It would cause a short. However, if you built a bridge that could keep them separate on the PSU side, and connected on the other, you'd be good to go. (btw, I don't know how to do that :p )

But if you were able to connect the two together, you'd have 27A available. I would just use all the Yellow cables that go to the molex connectors. They are all 12V and full amps. Or, if the tester will run on 5V, use all the Red wires.

The BlueLover above "looks" dodge. Crappy solder connections.
 

DarkRaven

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Sep 2, 2017
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Sadly you can't use these meters. Well, you can, but they aren't giving you a CC discharge. These are the type that uses a resistor as the load as it seems.
I find it hard to believe that you can't get an Opus in the UK. But if it is the case then you can always order stuff in China or somewhere else in Europe where we have them available. For instance at NKON in the Netherlands: https://eu.nkon.nl/charger/charger-suitable-for-battery-type/lithium.html
They also have the MC3000, which I prefer, and some other models that may or may not have a discharge function as well.

Not really sure what you want to do with the Dell PSUs though. Capacity testers don't need much power, you could probably run a hundred on one of the PSUs. Charging is another matter if that is what you want to do. Check the specification of the 12V rail on the PSU as it probably can't to 14A and 13A on 12VA and 12VB and the same time as that would be 12V*27A = 324W and if this is a 255W PSU than it is probably more like 20A / 240W combined on both rails. That would be enough power to charge ~50 cells at 1A, for example 48 cell using 12 Opus or 50 cells using 50 TP4056 if you do a 12V to 5V DC-DC conversion first using a bit (or several small) DC-DC converters.

Korishan said:
Well, if I'm not mistaken, the 12VA and 12VB are not the same. One is +12V, the other is -12V. So, I wouldn't go connecting them together on the PSU. It would cause a short.

Nope, -12V is rarely used and certainly not up to tens of amps ;) -12V is, if it is existant, a single blue wire on the ATX connector. These are just two +12V rails.
Oh, and you could connect +12V and -12V if you want. If you do it right you get +24V or 0V as a result :)
 
Joined
Oct 21, 2017
Messages
43
DarkRaven said:
Sadly you can't use these meters. Well, you can, but they aren't giving you a CC discharge. These are the type that uses a resistor as the load as it seems.
I find it hard to believe that you can't get an Opus in the UK. But if it is the case then you can always order stuff in China or somewhere else in Europe where we have them available. For instance at NKON in the Netherlands: https://eu.nkon.nl/charger/charger-suitable-for-battery-type/lithium.html
They also have the MC3000, which I prefer, and some other models that may or may not have a discharge function as well.

Not really sure what you want to do with the Dell PSUs though. Capacity testers don't need much power, you could probably run a hundred on one of the PSUs. Charging is another matter if that is what you want to do. Check the specification of the 12V rail on the PSU as it probably can't to 14A and 13A on 12VA and 12VB and the same time as that would be 12V*27A = 324W and if this is a 255W PSU than it is probably more like 20A / 240W combined on both rails. That would be enough power to charge ~50 cells at 1A, for example 48 cell using 12 Opus or 50 cells using 50 TP4056 if you do a 12V to 5V DC-DC conversion first using a bit (or several small) DC-DC converters.

Korishan said:
Well, if I'm not mistaken, the 12VA and 12VB are not the same. One is +12V, the other is -12V. So, I wouldn't go connecting them together on the PSU. It would cause a short.

Nope, -12V is rarely used and certainly not up to tens of amps ;) -12V is, if it is existant, a single blue wire on the ATX connector. These are just two +12V rails.
Oh, and you could connect +12V and -12V if you want. If you do it right you get +24V or 0V as a result :)

Well thats part of my problem is I can get say the Opus chargers but delivery is 6-8 weeks and the unit is 35 from china which is no guarantee they are genuine!

The link above to nkon is great, hadn't come across this but by the time you add postage and Tax im up to 50 :(I watch a review yesterday on the MC3000 and indeed this does look a great bit of kit! has a bigger price tag which means I would drop to just test 8 at a time!

Which makes me think ok surely I this can be done DIY for cheaper. I'm using the tech data from the PSU but noticed the one I've brought home is in fact not a Dell brand and probably explains the incorrect figures printed on the PSU.

Im looking to charge to 4.2, discharge, then Charge again similar to my current charger. Im actually planning on fitting this charging station inside a PC Tower case on an acrylic backboard with to fans blowing and extracting over the batteriesand gives methe ability tocarrying around! Is there any capacity tester boards that give you the cc's?


Also I am assuming I need to roughly achieve 500mA discharge?


What is this....

YouTube Batch Tester could this be the answer?
 

DarkRaven

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Sep 2, 2017
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1,235
You don't necessary want fans blowing air over the cells. That could mislead you into thinking the tested cell doesn't get hot. 500mA discharge is ok if that is what you want. I think 1000mA is a bit more versatile, but if you are sure that 500mA is a viable maximum for you then this is ok as well.
There are capacity testers that cost around 10 EUR in china and process a single cell. No real benefit over an Opus as far as the price goes.
The batch tester you have found is not the answer if you ask me. It is a bit hard to tell because there is no proper explanation of what he or she is trying to achieve but I take a guess here:
The DS2784 is a low voltage protection and fuel gauge IC. This has nothing to do with capacity testing. There is a resistor attached as a load and the IC measures the accumulated current over time. It works the same as the two capacity testers you have found on Amazon. Jump to 5:00 in the video and look at the software readout. It tells you the instantaneous current and the average current. This is used in a device to tell the user about the SoC of the battery but isn't useful to test the capacity if there is no constant current load.
 

Oderus420

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Joined
Oct 1, 2017
Messages
243
> Well thats part of my problem is I can get say theOpuschargers but delivery is 6-8 weeks and the unit is 35 from china which is no guarantee they are genuine!

Get them from GearBest.com. I bought two and I'm pretty sure they're legit. I think someone questioned how to check a fake vs. real Opus and I'm not sure anyone had any proof of a fake one.
 
Joined
Oct 21, 2017
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Oderus420 said:
> Well thats part of my problem is I can get say theOpuschargers but delivery is 6-8 weeks and the unit is 35 from china which is no guarantee they are genuine!

Get them from GearBest.com. I bought two and I'm pretty sure they're legit. I think someone questioned how to check a fake vs. real Opus and I'm not sure anyone had any proof of a fake one.

Cheers dude

Great Price to and 59p to deliver within 3 weeks! Ordering 2!

What I might do then is create a charging station with these power suppliesto cut the charge times down in that case! makes it easier :)
 

jdeadman

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Joined
Mar 28, 2017
Messages
931
I use the 1st one you linked and while it's not Constant current that's not a big deal to me as I'm looking for a number that 's a reference. and realistically when i do a 1A CC discharge I am only off aby less than 5% so it's not that big of a deal for me.
 
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