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Unread 09-26-2018, 09:43 PM   #1
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Default Chargery BMS for 14 module Leaf pack

Anybody using the Chargery BMS? I don't need all the bells and whistles, just want the job to be done. Wondering which one I should go with. I already have the chargery charger. Thoughts? Advice?
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Unread 10-07-2018, 12:19 PM   #2
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Default Re: Chargery BMS for 14 module Leaf pack

For those interested:

After some back and forth e-mails with Jason Wang, of Chargery, Here is what I have learned:

The BMS16, does not manage the individual cells. (apparently it is just for monitoring the cells????)

The BMS16T, will work for the 14 module Leaf battery pack, does manage the individual cells, however it is not currently available-they are in the process of updating it and will produce-you can pre-order them, they will be less expensive than the BMS24T

The BMS24T, will also work for the 14module Leaf battery pack, does manage the individual cells, is currently available, I've seen them anywhere between $300-$350 before shipping
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Unread 10-08-2018, 08:41 AM   #3
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Default Re: Chargery BMS for 14 module Leaf pack

Quote:
Originally Posted by BBBHC View Post

The BMS16, does not manage the individual cells. (apparently it is just for monitoring the cells????)
Now that is an important piece of information.
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Unread 10-08-2018, 08:59 AM   #4
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Default Re: Chargery BMS for 14 module Leaf pack

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Originally Posted by DaveTM View Post
Now that is an important piece of information.
Yeah! I thought so as well. Glad I didn't just pull the trigger on it, like I was going to. Price difference between that and the BMS24T is quite significant. Glad I listened to my gut, "there has got to be something majorly different for there to be such a difference in price".
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Unread 10-14-2018, 09:24 PM   #5
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Default Re: Chargery BMS for 14 module Leaf pack

Quote:
Originally Posted by BBBHC View Post
Yeah! I thought so as well. Glad I didn't just pull the trigger on it, like I was going to. Price difference between that and the BMS24T is quite significant. Glad I listened to my gut, "there has got to be something majorly different for there to be such a difference in price".
My former business partner use to have a saying similar to that. Like "If your gut tells you it doesn't make sense......then it's likely it doesn't make sense."
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Unread 10-18-2018, 09:35 AM   #6
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Default Re: Chargery BMS for 14 module Leaf pack

I am using a Chargery C10325 without a BMS.
I have a few different packs made from leaf modules.
I have one in 14S4P.
I hooked all the modules together in parallel first to allow them to balance. They all had the exact same voltage after a few hours of being hooked up in parallel.
I wont be opting for the BMS


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Unread 10-18-2018, 10:07 AM   #7
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Default Re: Chargery BMS for 14 module Leaf pack

Quote:
Originally Posted by Fastest1 View Post
I am using a Chargery C10325 without a BMS.
I have a few different packs made from leaf modules.
I have one in 14S4P.
I hooked all the modules together in parallel first to allow them to balance. They all had the exact same voltage after a few hours of being hooked up in parallel.
I wont be opting for the BMS


Sent from my iPhone using Tapatalk Pro
That works well for new cells due to their closely matched characteristics.

If your cells are used, the best option if you are not going to use a BMS is to bottom ballance them, not just get them to the same voltage.
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Unread 10-18-2018, 05:57 PM   #8
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Default Re: Chargery BMS for 14 module Leaf pack

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Originally Posted by Sergio View Post
That works well for new cells due to their closely matched characteristics.

If your cells are used, the best option if you are not going to use a BMS is to bottom ballance them, not just get them to the same voltage.
And monitor the individual cell voltages while charging to ensure your peek voltage cutoff is low enough to not have any single cell go over voltage.
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Unread 10-27-2018, 09:38 AM   #9
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Default Re: Chargery BMS for 14 module Leaf pack

Thanks for the tips.
I hooked all of the modules in parallel for a day.
All modules attained the same voltage.
I then reassembled the pack in the 14s configuration and charged it.
So far so good.
The loading it wont happen til it is installed in the cart


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Unread 10-27-2018, 10:34 AM   #10
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Default Re: Chargery BMS for 14 module Leaf pack

Fastest1, getting the batteries to the same voltage level may not always deliver the results You want.

Take readings of all the individual batteries after they are charged and then again the first few times you use the pack.

Folks that use Lithium batteries without a BMS typically "Bottom Balance" the batteries, this post explains a little more:
What size Power Resistor do I need to pull down lithium cells?
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