Beginners Guide to Processing 18650 Cells | Cell Database


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Another UK member
#1
Hi all, the name is zag.

I've recently added solar to my camper van(charge controller and leisure battery) and house(via micro inverters) and looking to take things to the next level with battery storage.

I also work in IT where we have a number of older bits of IT equipment recycled so I may have access to some batteries available to build with.
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#2
Welcome!

You have probably come to the right place!
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#3
Welcome!
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#4
So my n00b question is...

Now I have started collecting batteries, whats the best device to measure each batteries total capacity?
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#5
That question is asked often, however there is no definitive answer. Depends on your definition of "best" and the general circumstances like number of cells, budget and so on.

If you only have a few cells then you can use anything, even something like a charger from SkyRC's IMAX B6 series which only discharge one cell at a time. Especially useful if you have one of them already, it would be a start.
If you have many cells to test howver then this isn't really suitable. Then the Opus BT-C3100 is a cheap solution for four cells at a time. The slightly more expensive solution for four cells would be the SkyRC MC3000 for example. If four still isn't enough you can get multiple ones of either of them.
I think one of the more expensive XTAR chargers for four cells has a discharge function as well, I don't know the name from the top of my head though. I think it is more expensive than the Opus but cheaper than the SkyRC.

All of the named devices can also charge the cells of course. If you want to go big and process many cells you want even more capacity to charge and discharger bigger amounts of cells at the same time. Instead of doubling the amount of devices you could build your own charging array with TP4056 modules and 18650 holders.

If four per device and multiple devices is not what you want then you probably have to build a device yourself. There are videos from the user mrconstantin who is doing something like this right now: http://www.diypowerwalls.com/t-64-128-ce...Discharger
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#6
Thanks, this site could really do with a getting started thread with an equipment list Wink

Went with the Opus BT-C3100 myself.
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#7
It wouldn't be a very extensive list though but I will think about putting together a little something.
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#8
Peter have a rather large list with all prices as soo. Mine is not as detailed but yes you can check that out.. Beware of that we talk about 100s or even 1000s of dollars for some of us Smile
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#9
It begins....

[Image: 20170913_075833367_iOS.jpg]
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#10
So now I have my first set of batteries sorted. What is the process of testing them?

I have the Opus BT-c3100

Do I do a quick test?
Do I do a full charge and refresh?
What rate should I set it to?
What is a "good cell"?
What is a "bad cell" that needs chucking?

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