Wednesday, August 2, 2017

Re: [Electric Boats] 18650 bank. Parallel packs, connected in series, or series strings, connected in parallel?

 

This was walmart.com. So there is recourse, if they are garbage. I realize that they are most likely not actually 5ah cells, but if they are 2ah I would be happy with them.


---In electricboats@yahoogroups.com, <gcode.fi@...> wrote :

Fake.
Counterfit.
Do not exist.

Best 18650 cells were 3100 mAh, nowish 3300 mAh iirc- PANA.
There are no commercial cells being made to higher capacity.

The fakes usually work ok for 1-2 months - my experience.

I would recommend only buying from a seller, asia is fine, with address,
phone nr, contact details, website, and 1 yr plus presence.
A typical "us seller" is a bounce remailing address when fake goods are
sold for $$$.


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RE: [Electric Boats] 18650 bank. Parallel packs, connected in series, or series strings, connected in parallel?

 

Okay. That makes sense. And for protection from shorted cell runaway, relying on 5a fuse wire will keep it safe?

I dont believe I would actually have 100ah from a 20p arrangement, though. I seriously doubt that the cells are actually 5ah like they say. I would be quite content if they consistently test in the neighborhood of 2ah. I would probably be looking at 12s 50p or maybe 13s 50p.



---In electricboats@yahoogroups.com, <matwete@...> wrote :

King o'NO -

 

You definitely don't want to wire these up as parallel groups of series cells.  Sure, it'd be safer from a shorted cell standpoint, but from a cell monitoring standpoint, you'd have to monitor each and every cell individually.  By instead wiring 20 cells, say, in parallel, you only need to cell monitor each group of 20 cells.  So, if you were going with a 12S(20P) arrangement, you'd have 100ah @ 31-48v or so and only have a BMS that monitors the 12 clusters.  That's how the pros do it (e.g. Tesla).

 

-MT


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Tuesday, August 1, 2017

Re: [Electric Boats] 18650 bank. Parallel packs, connected in series, or series strings, connected in parallel?

 

I recently assembled a 24v 100AH bank of 8 CALB LiFePO4 cells from Thunderstruck. It works well so far. I don't see any point in bothering with 18650 or other small cells for that purpose. It just seems really fussy and one doesnt gain any power or energy density.

I have "good" 18650 cells for head lamps from e2fieldgear.com. These hold about 3000 mAH. I got these in 2015 and they are still going strong.

Will

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Posted by: Will Marsh <willmarsh3@gmail.com>
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Re: [Electric Boats] 18650 bank. Parallel packs, connected in series, or series strings, connected in parallel?

 

Fake.
Counterfit.
Do not exist.

Best 18650 cells were 3100 mAh, nowish 3300 mAh iirc- PANA.
There are no commercial cells being made to higher capacity.

The fakes usually work ok for 1-2 months - my experience.

I would recommend only buying from a seller, asia is fine, with address,
phone nr, contact details, website, and 1 yr plus presence.
A typical "us seller" is a bounce remailing address when fake goods are
sold for $$$.

On 01/08/2017 19:37, king_of_neworleans wrote:
> I just saw a pretty good deal on nominally 5ah 18650 cells in bulk and
> I was thinking about putting together a small (100ah or so, 48v or
> thereabouts) bank of them.

--
-hanermo (cnc designs)

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Posted by: Hannu Venermo <gcode.fi@gmail.com>
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RE: [Electric Boats] 18650 bank. Parallel packs, connected in series, or series strings, connected in parallel?

 

King o'NO -

 

You definitely don't want to wire these up as parallel groups of series cells.  Sure, it'd be safer from a shorted cell standpoint, but from a cell monitoring standpoint, you'd have to monitor each and every cell individually.  By instead wiring 20 cells, say, in parallel, you only need to cell monitor each group of 20 cells.  So, if you were going with a 12S(20P) arrangement, you'd have 100ah @ 31-48v or so and only have a BMS that monitors the 12 clusters.  That's how the pros do it (e.g. Tesla).

 

-MT

 

From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of king_of_neworleans
Sent: Tuesday, August 1, 2017 10:37 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] 18650 bank. Parallel packs, connected in series, or series strings, connected in parallel?

 

 

I just saw a pretty good deal on nominally 5ah 18650 cells in bulk and I was thinking about putting together a small (100ah or so, 48v or thereabouts) bank of them. I know not to actually expect more than about 2ah out of them LOL but they were cheap, from a US seller, and I figured I could maybe use 5a fuse wire to deal with cells that go short on me, and manually monitor groups, and match the cells appropriately when building. Any thoughts? It seems to me that it would be easier to balance/match a bunch of series strings wired together in parallel than a bunch of parallel bundles connected together in series. Not sure how serious I want to get about this project at the moment, but I thought maybe someone here might have tried this. I am aware of the fire hazard, but I think with decent spacing and 5a fuse wire, I shouldnt have to worry too much about thermal runaway. Since it will be a secondary and not my primary bank, if it simply fails to deliver the voltage and current expected, no biggie, I just try again with a proper BMS. Your input, gentlemen? Is 5a fuse light enough for this?

 

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Posted by: "Myles Twete" <matwete@comcast.net>
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[Electric Boats] 18650 bank. Parallel packs, connected in series, or series strings, connected in parallel?

 

I just saw a pretty good deal on nominally 5ah 18650 cells in bulk and I was thinking about putting together a small (100ah or so, 48v or thereabouts) bank of them. I know not to actually expect more than about 2ah out of them LOL but they were cheap, from a US seller, and I figured I could maybe use 5a fuse wire to deal with cells that go short on me, and manually monitor groups, and match the cells appropriately when building. Any thoughts? It seems to me that it would be easier to balance/match a bunch of series strings wired together in parallel than a bunch of parallel bundles connected together in series. Not sure how serious I want to get about this project at the moment, but I thought maybe someone here might have tried this. I am aware of the fire hazard, but I think with decent spacing and 5a fuse wire, I shouldnt have to worry too much about thermal runaway. Since it will be a secondary and not my primary bank, if it simply fails to deliver the voltage and current expected, no biggie, I just try again with a proper BMS. Your input, gentlemen? Is 5a fuse light enough for this?


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Re: [Electric Boats] 15hp outboard conversion to electric

 

Put me on the list for a copy or contact too  TY



 



I'll have him contact you


On Mon, Jul 31, 2017 at 7:39 PM, laurentcat@yahoo.com [electricboats]
<electricboats@yahoogroups.com> wrote:
 

Thanks a lot for the advice. I am new to this forum, how do you contact another member directly? Thanks again!

laurent
From: "Daniel Michaels nov32394@yahoo.com [electricboats]" <electricboats@yahoogroups.com>
Sender: electricboats@yahoogroups.com
Date: Tue, 1 Aug 2017 01:08:31 +0000 (UTC)
To: <electricboats@yahoogroups.com>
ReplyTo: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] 15hp outboard conversion to electric

 

Talk to Scott Masterson, he has them perfected. It is a simple conversion


On Mon, Jul 31, 2017 at 5:41 PM, laurentcat@yahoo.com [electricboats]
<electricboats@yahoogroups.com> wrote:
 

I have a 15hp 2 stroke that I want to convert to electric. It is to power my 26 foot MacGregor sailboat. What motor do you recommend me using? I am on a low budget, so any ideas will be welcomed! Hopefully I can run it on 24 volts...?
Thanks!




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Posted by: "Capt.Len" <trikini2008@embarqmail.com>
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