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Bluetooth for multiple ANT BMS in parallel

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proover

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May 5, 2020
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Hi,

I was just trying to find an answer in tons of different threads here but failed so far.

I would like to setup 2 or 3 LiFePo4 battery banks in parallel, each one controlled via an ANT BMS.
The whole configuration needs to be done via bluetooth as far I understood. If now all 3 BMS are running, do I see 3 of them with the same name on the bluetooth side and have to guess which one is the right one? ;-) Or is there an option to change the Bluetooth name of each individual device?

Thanks, Markus
 
I did the same thing with a different Bluetooth bms and I had the option at the start to rename as bank1, and bank2, so then I could monitor, on separate device. I used my iPhone for one and the iPad for the other. Not sure for the ant bms.
 
Denis said:
I did the same thing with a different Bluetooth bms and I had the option at the start to rename as bank1, and bank2, so then I could monitor, on separate device. I used my iPhone for one and the iPad for the other. Not sure for the ant bms.
Click to expand...

Which one did you use? Do you have a link? Thanks
 
etn06448 said:
Which one did you use? Do you have a link? Thanks
Click to expand...
The bms I used had just came out and it lasted 15-16 hours and died. So I am just in the process to return and exchange with the new smart Daly bms plus the 2a active balancer.

This is the link for the broken bms,

C$ 162.69 | 1A/2A Active Balance Battery Protection Board Smart BMS 14S ~ 24S 100A 150A 200A 300A 400A Phone APP Lifepo4 li-ion LTO 16S 20S
a.aliexpress.com

7.4US $ 26% OFF|1a/2a Active Balance Battery Protection Board Smart Bms 7s ~ 24s 100a 150a 300a Can Rs485 Gps App Lifepo4 Li-ion Lto Jk 16s 20s - Battery Accessories & Charger Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
a.aliexpress.com a.aliexpress.com

It does work really good to balance, but the bms is defective.
 
Denis said:
The bms I used had just came out and it lasted 15-16 hours and died. So I am just in the process to return and exchange with the new smart Daly bms plus the 2a active balancer.

This is the link for the broken bms,

C$ 162.69 | 1A/2A Active Balance Battery Protection Board Smart BMS 14S ~ 24S 100A 150A 200A 300A 400A Phone APP Lifepo4 li-ion LTO 16S 20S
a.aliexpress.com

7.4US $ 26% OFF|1a/2a Active Balance Battery Protection Board Smart Bms 7s ~ 24s 100a 150a 300a Can Rs485 Gps App Lifepo4 Li-ion Lto Jk 16s 20s - Battery Accessories & Charger Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
a.aliexpress.com a.aliexpress.com

It does work really good to balance, but the bms is defective.
Click to expand...

That BMS looks promising. Too bad it's defective. I think that I'll go the same route as you with the Daly and a 2A active balancer.
 
proover said:
Hi,

I was just trying to find an answer in tons of different threads here but failed so far.

I would like to setup 2 or 3 LiFePo4 battery banks in parallel, each one controlled via an ANT BMS.
The whole configuration needs to be done via bluetooth as far I understood. If now all 3 BMS are running, do I see 3 of them with the same name on the bluetooth side and have to guess which one is the right one? ;-) Or is there an option to change the Bluetooth name of each individual device?

Thanks, Markus
Click to expand...

According to this thread, the ANT BMS doesn't support wiring multiple battery packs in parallel

diysolarforum.com

ANT BMS in parallel configuration

Hi Everyone I would like to know if anyone has successfully connected two 16S ANT BMS's ( 48V100Ah System) in parallel? Cells are from same batch in both batteries. We ask the seller and he said: " For Parallel, our bms do not support that. the parallel bms have hardware DCDC to avoid large...
diysolarforum.com diysolarforum.com

The Dongguan Daly Electronics rep on Alibaba also tells me :

All Daly BMS don't support in parallel. For series, depends on how many strings of battery pack. Only 2 BMS in series. YYou'd better don't in series and parallel
 
Their no reason you can't run this BMS in parallel. I have 2 setups. One in my 5th wheel camper with 4 separate batteries in parallel and each battery has its own BMS. The second is going into my semi which is 2 batteries each with the same BMS . I would like someone to prove to me you can't do it I'm doing and it works fine.

Greg
 
With DIY you're on your own, but it seems the Chinese BMS manufacturers we are using do not officially support parallel.

That maybe because they could only recommend such a configuration if they have factory tested it, or maybe because Lithium battery chemistry is very different to Lead acid.

What is supported is for example using 1 BMS for 2p4s to make a 24V pack with 16 cells.
 
As I created this thread some time ago maybe a brief feedback from my side:

So running 2 ANT in parallel (with 2 different blocks) works without any kind of problem. If you change the bluetooth address both appear as different devices and you can also monitor them in parallel.
 
I dlnt understand the issue with parallel bms, as long as each bms is in each battery array.

I know there are some of these which allow daisy chaining them together i.e. two 7s bms to make a 14s pack). seems like a lot to go wrong.
 
please help me
My BMS is faulty as shown in the picture
 

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quanghungtnth said:
please help me
My BMS is faulty as shown in the picture
Click to expand...
You haven't attached the temperature probes so your BMS is showing -30 C, this will trigger low temperature cut-off. You need to either connect the temp probes or set the low temp cutoff to something like -50 (I did this on 1 ant I have that arrived with a crushed connection port for the temp prob.) I know not ideal but works and it never freezes here in SE asia.

This solution while it should be done anyway, may not help you since the error seems to be related to the fet but could be the version of software. ANT sometimes reports things strangely.
Try a reboot of course as well..
 
proover said:
As I created this thread some time ago maybe a brief feedback from my side:

So running 2 ANT in parallel (with 2 different blocks) works without any kind of problem. If you change the bluetooth address both appear as different devices and you can also monitor them in parallel.
Click to expand...
I have 3 x Ants in parallel, I want to connect to each of them with one device as required. How do i change the bluetooth address?
 
change mac address..looks the menu, and set 4 last character..after setup..you bluetooth name will be change number your set
the parameter name : Bluetooth Mac Address before 100% Cell voltage parameter..please check
 
You can not use multiple bms's in one system.
Example:
If they are rated for 400a each you dont have 800a!
If you have a spike or a surge drawn of 500a it will be ok for the first time, but the second time it will fry your bms.
Example: Sunday morning, you want coffee and the wife wants tee its dark outside so lights are going on, at the same moment the freezer wants to run....
If one bms fails the other one must deliver all the power, that is asking for problems, brings us to example two:
Your cells are almost empty, one bms decided to cut off one bank because it is to low on volt, the other bms must deliver all the power....and a other fried bms.

Please design your bms (one that is) on what your system can deliver in TOTAL, and not that one accidentally spike..
Sooner or later one will give up.
My two cents of experience.
Go for batrium or bms123 smart.

With best regards Igor
 
I have two Ant Bms running. I have two, 24v 100ah CALB battery packs (8, 3.2v cells in series in each pack). The two packs are connected into my system in parallel. Battery cables to each pack MUST must be equal length (+ cables must match each other and the - cables must match each other in length). I will soon add two more 24v packs in parallel for a total of 400ah. Be sure to top balance all cells before introducing new packs (top balance the new packs also). The downside is I have to have a device for each bms. I am at two. Thankfully, I have an old iPhone that I use for one pack and my new phone for the other. Four devices may be pushing it for individual pack monitoring. Perhaps the ant people will upgrade the app soon so we don’t have to come up with creative work arounds. Recent Victron BMV-712 installation allows for a total system view. Ant app is really good for dialing in settings and occasional checking. I plan to leverage the Victron app more.
 
arulshah said:
change mac address..looks the menu, and set 4 last character..after setup..you bluetooth name will be change number your set
the parameter name : Bluetooth Mac Address before 100% Cell voltage parameter..please check
Click to expand...
sorry, i dont find any way to do it with xiangxiang apps. if i pres change bt address it switch to IFP settings... may i have an help?
 
I used to have 2 ANT BMS in parallel for my 24V battery packs, and in the end found no way to change the MAC addresses or any other thing to make them appear differently for neither iOS nor android apps.

I had to disconnect one of them completely and turn it off, so that I could be certain of which battery I was setting up or monitoring, and then repeat for the other battery. Just looking at the app in either iOS or Android, the data would randomly switch between the BMSs with no easy way to understand which one I was watching…

I ended up buying Overkill’s BMS, which is clearly better IMHO, to replace one of them. So now I have two apps on my iPhone and am able to monitor both easily. I did ask Overkill if they would support 2 packs in parallel, but they did not recommend that. (I still have a hard time understanding the ANT BMS state of charge, but that is a different thread!)
 
Ant BMS support changing Bluetooth MAC address if you are using the Mayi-BMS app. I have done it several times. Simply enter a number in the "Bluetooth MAC address" tab and hit set. See attached image.
 

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dapsyra said:
Ant BMS support changing Bluetooth MAC address if you are using the Mayi-BMS app. I have done it several times. Simply enter a number in the "Bluetooth MAC address" tab and hit set. See attached image.
Click to expand...
Thanks for the tip, I will try it if I ever get a need for that again!
 
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