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DIY 18650 20 bay Arduino managed Charger
#1
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Hi to all that clicked on this thread.
My Name is Mike, I am a 63 Mechanic with a few years in engineering. I have some Electronic experiance but just enough to know what I want to do is possible, even if I am not sure how.LOL

That said on to the topic of my project.

As a half century Tinkerer I have decided to build my own powerwall as have many on the board. I decided on a 20 bay size due to the fact it big enough for a reasonable through put of cells and small enough not to take up much room when the P/Wall is built.

After reading many articles and watching way too many u-tube videos I started to pick the best bits out of others designs.  Below is a first draught flowchart of what each cell section will look like.



I am going to use an Arduino Mega Micro to monitor different parts of each cell section, I havent coded since the TRS-80 and commodore64 era, but its like riding a bike, isn't it? 

Opionions and comments are more than welcome, I am old school so can take neg comments as easy as positive ones.

Cheers for now.. Mike.
YOLO is wrong, You live every day. You only Die once so it should be YODO. Angel
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#2
I think i get it - and it looks very interesting!
To make sure that when people comment, they are also trying to meet your aims, can you describe what you are intending?
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#3
Hi, your first layout looks grate (as simple as it is) but beware that the INA219 is an i²c device that only supports 16 addresses. So either you just make a 16 bay charger or you have to work around that issue (two separate buses or a multiplexer...) I will defiantly follow your progress. There is not just one way to build a charger. Please give us some more information on your goals.
I guess you want to build something, that helps to process used cells. So controlled charging and discharging while monitoring the current and voltage.
One thing that bothers me (personal opinion) is the TP4056 in combination with higher cell counts. "Nerdville" build a TP4056 based charger that processes 66 cells at ones. Be aware that your charger will need a Power-supply that can provide at least 20A @ 5V and your cables must handle that current. After all I think every solution that works safely and fits your needs is a good solution. Feel free to ask any questions and have fun with your project. You will defiantly learn a lot, even when building "just another charger".
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#4
Thanks for the feedback gentlemen, its exactly what I am looking for in my current low  experience level. But i am a fast learner.
That diagram in my first post is basically how i wish each channel of the 20 bay charger to look. I am trying to keep everything isolated per bay, so a failure will be limited to one "row" only.

Gummiadler made a great point that the INA419' only have 4 addresses, even though the datasheet states 16 only 4 are accessible on the board. I am going to be using 20 of these, which looking at a glance means I will have 5 groups of 4 , and 5 sets of conflicting I2C addresses. You are correct. So below is how I intend to get around that problem.



As you can see, I could expand to more sub-sets of INA419's but think I will save the spare SD/SC channels for a few selectively placed screens, so I can see whats happening at a glace.

All data that I can measure I would like logged onto a spare laptop in spreadsheet form pref Excel, and then write routines to correlate all the info into useful charts. Because of this Data Store wish, I believe I may need to add a second Arduino Mega to help with cataloging data.

Although I am new on this forum I have spent weeks researching all the corners if the web, the more I learnt, the more I realize how stupid I am. Hopefully with the aid of others I can revers that trend and become average.

Raved enough for now.... Oh as for power supply, out in the shed I have 2-3 dozen commercial servers and at least half have good strong power supplies at least the Dells have, Couple that with a capacitor bank to smooth out the supply, we might have dependable power.

Mike
Korishan likes this post
YOLO is wrong, You live every day. You only Die once so it should be YODO. Angel
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#5
I would go for tp5100 instead of tp4056! It has 12V, 2A charging current and reverse protection...

Regards
Karl
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#6
(02-20-2019, 07:08 AM)Charly144 Wrote: I would go for tp5100 instead of tp4056! It has 12V, 2A charging current and reverse protection...

Regards
Karl

Hi Karl, from what little i have read on these, they charge 2 cells in a series configuration. If that is correct. its not the best config when playing with "unknown" condition Cells. I may be wrong, will need to do a bit more digging to see if I understood it correctly when I read the article.

Mike.
YOLO is wrong, You live every day. You only Die once so it should be YODO. Angel
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#7
No, the TP5100 can charge in 1s or 2s configurations. In both modes it can charge at 2A max. It does take up a little more pcb space as it requires an external inductor. But for it's pros, I think the space requirement is worth it.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
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#8
Bugger 25 tp4056's already ordered.. BUT I will still delve into the TP5100, after all DIY powerwalls drink more money than they return dont they. Unless you start at 12yrs old.

BTW my liitoKala 500II bit the dust last night... grrrrrrrrrr.
YOLO is wrong, You live every day. You only Die once so it should be YODO. Angel
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#9
When you get them, verify that the ICs are legit TP units. There's are LOT of fakes/clones out there. This is one reason why I stopped bothering with the TP4056 (i used to sell them on ebay; i stopped when i realized the ones i had were fakes).
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
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#10
Any give-away on what to look for? I ordered these through Banggood , dont know if thats good or bad not having dealt with them before
YOLO is wrong, You live every day. You only Die once so it should be YODO. Angel
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