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Author Topic: 18650 cell batteries  (Read 957 times)
stannn
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« Reply #15 on: September 15, 2018, 12:13:05 PM »

I think you mean redox flow battery biff.
Stan
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biff
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« Reply #16 on: September 15, 2018, 01:04:22 PM »

    facepalm facepalm facepalm,
                 Thanks Stann.
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Paul_m
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« Reply #17 on: September 15, 2018, 02:05:14 PM »

Tiff, I did,  a couple of days ago.  I never realised that it was such a big thing.
I think I'm going to devote my spare time through the week while working away to it.
What's the worst than can happen?  I waste a loss of my own time. .
Well that's free to me. A few hundred cells and some consumables.
I'll learn something along  the way.
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Many thanks,

Paul
Fionn
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« Reply #18 on: September 15, 2018, 04:13:47 PM »

I'd advise picking up second hand growatt or EV lithium packs if you want to do large scale storage for your home.

They're a lot safer, more reliable and less time consuming than large 18650 packs. Also less expensive in my experience, the costs of supplies required for the 18650 pack builds add up quite fast.
Last I looked the 18650 guys seem to have converged on a design with large quantities in parallel wired to busbars via axial fuses as has been described here. It still requires a lot of management keeping them in check.
I have a quantity of 18650s myself but I only use them for small projects - torches, battery banks and the likes.
A discharge tester is essential to sort the wheat from the chaff.
I may use some for ebikes etc down the road, although I still have a lot of LiPo and LiIon for that.

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Paul_m
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« Reply #19 on: September 15, 2018, 04:26:06 PM »

I had a growatt lined up for 1k. Well 2 actually, but I don't want it right now. I liked the idea of adding a pack at my leisure to increase ah slowly.
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Paul
Fionn
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« Reply #20 on: September 15, 2018, 06:12:37 PM »

It's not really an option to add capacity as you go with the 18650 approach to be honest. You need to pick your series voltage at the start and then if you want to add capacity you would need to add cells to each pack in the series string.
I think an IR camera would be a huge asset for cell management if you go down that route, it should help show up weak cells under charge before they fail.
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biff
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« Reply #21 on: September 15, 2018, 06:22:18 PM »

Excellent advice Fionn, genuflect
                     Biff
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camillitech
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« Reply #22 on: September 16, 2018, 09:21:52 AM »


I think an IR camera would be a huge asset for cell management if you go down that route, it should help show up weak cells under charge before they fail.

An IR camera is a huge asset for hunners of things and an IR thermometer at least is essential.
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