Beginners Guide to Processing 18650 Cells | Cell Database


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Lifepo4 haul
#1
Hello powerwallers,

I picked up a few unused CALB Lifepo4 batteries, including all busbars, charger, BMS, bolts, washers powder coated battery cases.

 16 x 100 ah

28 x 60 ah.

I just missed out on 8 x 400 ah. Oh well, I'm happy with what I have. 


I bought them from a solar company who decided not to use them, they were imported approx 3 years ago and are all sitting at 3.25 - 3.28.

My question is now what do I do with these cells. I have already wired one 60 ah battery for 12 volts and will make a fantastic camper battery!

The charger and BMS came with no instructions, I would employ and electrician (brother in law) anyway when it comes to that.

Doesn't seem like enough storage for a house solar setup. I need to do more research.

What would you do with them??


   
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#2
Ship them to me Smile nah build ur self a decent 48v system
BlueSwordM likes this post
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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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#3
Sweet!
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#4
(03-15-2017, 08:34 AM)daromer Wrote: Ship them to me Smile  

I was waiting for that Tongue

Thanks Daromer. Can you see any issues in mixing capacities ie. 60 & 100 ah in a solar setup with these cells?

I will have my brother in law look at the charger and bms I have and try to find some info on the web from the manufacturer as all the documentation was lost for it
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#5
Can anyone tell me whether mixing capacities with these cells is an issue?

I know its not a good idea with lead acid
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#6
Lead acid works differently so on those you may get issues because you rely on bulk/floating to max out a lead acid and the lower cap cells will get a lot longer high voltage exposure. And that's one of the reasons you should not mix them.

I have no issue if you mix those in a bank as long as they are the same chemistry and i would do every one of them in their own string. I cannot help you with the BMS though but the manufacturer might have some documents you can use for it.


Damn that haul is impressing.
Wattsup and BlueSwordM like this post
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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#7
(03-17-2017, 06:01 AM)daromer Wrote: Lead acid works differently so on those you may get issues because you rely on bulk/floating to max out a lead acid and the lower cap cells will get a lot longer high voltage exposure. And that's one of the reasons you should not mix them.

I have no issue if you mix those in a bank as long as they are the same chemistry and i would do every one of them in their own string. I cannot help you with the BMS though but the manufacturer might have some documents you can use for it.
T distracted

Damn that haul is impressing.

Thanks mate.

These batteries are going to teach me a lot, that's for sure!

Lesson no1. Don't tighten bolts on busbars and get distracted when your wife comes out and asks a question. There will be sparks Confused

Lesson no.2 Do use a spanner covered in insulation tape while tightening connectors Big Grin

I will share some of my journey with these cells for if anyone is interested.

I've decided to keep one 12v 60 ah battery aside for camping etc.

After doing a bit of YouTube/ internet schooling I  have learned that these cells should be bottom balanced as a 12v battery.
The battery started at 13v as SOC from factory appears to be 3.25 per cell.

The process:
1. Discharge the pack down to 12v.
2. Individually discharge the cells to 2.5v. (I'm using imax b6 on nimh setting as that's all iI have at this stage)
3. Cells will bounce back to around 2.75v, once all settled at this voltage charge all cells together to top voltage
I've also connected balance leads and mounted the cells in one of the cases.

Feel free to comment or offer advice as this is a steep learning curve for me.

   



Anyone know how to rotate the images??
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#8
Excellent Number One Lesson!!! Big Grin

keep us posted! The more set ups that are logged, the better everyone learns, and the less mistakes (lesson #1) the next one makes Wink
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#9
I have discharged battery to 12v and individual cells to 2.75, have charged it back up to about 13.5 volts with imax and 2 x100 solar panels but don't think it's enough to fully charge the 60 ah.

Think I'm going to need an alternative charger.

I know of the icharger and lab pro 8 but wondering if there are any cheaper option?

Do you guys have any suggestions?
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#10
Why dont you think its enough? If im not mistaken you need to bring the cells up to 3.65V per cell. (Dont take my word on it since i havent checked the datasheet)

You can use a normal DC/DC inverter hooked up to battery or grid and charge with as long as you keep an eye on it.

Example: http://www.ebay.com/sch/i.html?_from=R40...5&_sacat=0

There are others of course. But i would not charge multiple in series. Only 1 cell at a time or multiple in paralell.
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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