Daly or other BMS for 14s 52V pack

Batteries, Chargers, and Battery Management Systems.
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Blacksword   10 mW

10 mW
Posts: 20
Joined: Jul 21 2020 9:47am

Daly or other BMS for 14s 52V pack

Post by Blacksword » Jan 13 2021 7:18pm

Hi,

I am building a 14s8p pack using Samsung 25R cells capable of 160A max. 58.8V charged, 50.4 nominal, which is going to power a 750W hub motor set at 750W ~20AMPs at the controller, nothing crazy.

This is my first pack so I am trying to find a top quality BMS, something that's easy to work with, super reliable and has a bluetooth phone app.

I saw the Daly BMS but am having trouble picking the right one, all their 14s models seem to state 3.7volt model 14s 48V, they also show common and separate port. Why do these state 3.7v and 48v for 14s is that just a semantics and whats the different between the common and separate port models?

Is there a better bms out there, whats your goto BMS?

BlueSeas   100 W

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Location: St Petersburg

Re: Daly or other BMS for 14s 52V pack

Post by BlueSeas » Jan 13 2021 9:46pm

Been researching BMS products. I think Daly may have the largest BMS market share, but they are just rolling out their Bluetooth products. Two years ago I used one from here:

https://www.lithiumbatterypcb.com/

I was happy with the 72V 20S I bought. Still working just fine. I think they may have been the first Bluetooth BMS from China. Although it's really hard to tell who makes what. It uses the XiaoxiangBMS app. Defiantly different branding available for this one.

I just purchased a JK BMS to try out. See:

https://www.jkbms.com/products/active-balancer-bms/

The physical size is smaller than I imagined for a 150A BMS. Supposedly has Bluetooth built in on the board. Mine is still in the box. Might have more to say in a couple weeks.

I agree Bluetooth is really worth it, especially for the incremental cost. There are others with serial or CANbus interfaces, but those three are the only ones with smartphone BT interfaces I know of.

None I found were available in the US. That could change day to day though as stock levels change. The JK one was ordered about 12/23 and delivered 01/12.

Happy hunting.

Cdub   1 mW

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Re: Daly or other BMS for 14s 52V pack

Post by Cdub » Jan 13 2021 11:02pm

I’ve built several battery packs with Daly bms’s. They are a great product. Just to be clear. You are building a 14s not a 13s?
Why go 8p to push only 20 amp? If it’s more range you want, I would go with a lower discharge battery with a higher capacity. 8 in parallel 25R can handle 160 amps constant.


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Cdub   1 mW

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Re: Daly or other BMS for 14s 52V pack

Post by Cdub » Jan 13 2021 11:07pm

I see what you mean by AliExpress showing 14s as 48v. But if you go to the Daly store in AliExpress you will see all the specs and that the 14s is 52v.
I hear you can even customize your fully charged voltage and low cut off. I’ve never asked though.


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Dui, ni shuo de dui   10 kW

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Re: Daly or other BMS for 14s 52V pack

Post by Dui, ni shuo de dui » Jan 14 2021 1:05am

I'm using the ANT BMS, they are in my opionion better than the Daly, mainly because they have a much higher balancing current (200mA vs 30mA) and because they can work with any number of cells (you can buy a 24S and it will still work if you only use 12S, you are not stuck with the amount of cells you decided in the first place), which is not possible with the Daly. They are also a lot cheaper.
Downside is that they do not come with an enclosure and they are a bit more difficult to work with. The Daly sure looks nicer.
:bolt: :bolt: My new Build in Progress: Electric Roadster 24S2P A123 cells :bolt: :bolt:
viewtopic.php?f=12&t=109246&p=1601545#p1601545

:bolt: :bolt: My electric Ninja 250 clone: 16 000W 72V40Ah A123 cells : :bolt: :bolt:
viewtopic.php?f=12&t=90032

:bolt: :bolt: My electric Scooter: 11 000W 72V 50Ah LiFePO4 cells: :bolt: :bolt:
viewtopic.php?f=12&t=75912

Blacksword   10 mW

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Re: Daly or other BMS for 14s 52V pack

Post by Blacksword » Jan 14 2021 2:22am

Cdub wrote:
Jan 13 2021 11:02pm
I’ve built several battery packs with Daly bms’s. They are a great product. Just to be clear. You are building a 14s not a 13s?
Why go 8p to push only 20 amp? If it’s more range you want, I would go with a lower discharge battery with a higher capacity. 8 in parallel 25R can handle 160 amps constant.


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Yes 14s 8p. It's going to power a bafang geared hub motor, which will get set at between 15-30amps at the controller so 750-1500w at 52v. So each 8p parallel set could provide more than enough current for my application. At least that's my logic. Thoughts?

Cdub   1 mW

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Re: Daly or other BMS for 14s 52V pack

Post by Cdub » Jan 14 2021 2:33am

Dui, ni shuo de dui wrote:I'm using the ANT BMS, they are in my opionion better than the Daly, mainly because they have a much higher balancing current (200mA vs 30mA) and because they can work with any number of cells (you can buy a 24S and it will still work if you only use 12S, you are not stuck with the amount of cells you decided in the first place), which is not possible with the Daly. They are also a lot cheaper.
Downside is that they do not come with an enclosure and they are a bit more difficult to work with. The Daly sure looks nicer.
I’ve heard good things about the ANT BMS. Higher balance and current would be nice for quicker balance charging. I use Daly because they come in a nice sealed small package. I generally don’t break apart my battery packs once assembled and sealed.


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Cdub   1 mW

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Re: Daly or other BMS for 14s 52V pack

Post by Cdub » Jan 14 2021 2:44am

Blacksword wrote:
Cdub wrote:
Jan 13 2021 11:02pm
I’ve built several battery packs with Daly bms’s. They are a great product. Just to be clear. You are building a 14s not a 13s?
Why go 8p to push only 20 amp? If it’s more range you want, I would go with a lower discharge battery with a higher capacity. 8 in parallel 25R can handle 160 amps constant.


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Yes 14s 8p. It's going to power a bafang geared hub motor, which will get set at between 15-30amps at the controller so 750-1500w at 52v. So each 8p parallel set could provide more than enough current for my application. At least that's my logic. Thoughts?
3p would be sufficient and having more in parallel will help to reduce voltage drop and battery life. 25r are happy at around 10amps per cell and of course rated for 20. But at 2500 mah rating per cell you could go with a higher capacity battery in a 4+ parallel configuration. (If you have not already purchased the Samsung 25r). 8p definitely leaves you room for expansion using that configuration. Possibly adding a front hub motor and make it two wheel drive!


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