Newbie BMS Question

ghostriderf14

New member
Joined
Dec 7, 2017
Messages
2
So I've spent many sleepless nights watchingYou Tube videos and taking notes by the pages but I can't figure out how do Iwire up a BMS on my battery bank.

I've made up a 4x10 battery bank ( I plan to keep adding more in the future)for a 12v output to my inverter but I don't understand the wiring of a BMS as the ones I can buy are not for 40 cells at 12v.


Am I missing something? I thought that each cell (battery) gets a wire off the BMS. Like I said I can't find a multi-cell BMS for 12v, can it be done or do I strap 2 or three BMS's on the battery bank?

Thanks for your reply,
Brian
 
image_uaogov.jpg
So you are doing 4s10p 4 blocks in series each block has 10 cells in parrel. A 4s bms will have 5 small wires. 4 red and one black. Start with the black and connect it to the negative of your 4s10p pack (the negative at the end of series of blocks) then you connect the rest of the positives to the positive of each block (which will always be connected to the negative of next block do to the series connection) You will then have to connect some thicker wires to the psotive and negative of the bms and battery
 
In Jason's post, the cell numbers (1, 2, 3, 4) can have any number of cells connected parallel. Those numbers represent 1 cell, or 100 cells, or 1000 cells connected in parallel. Then each of those parallel connected packs are connected in series (positive to negative).
You should look up the definition and explaination of Parallel and Series connected cells as this will become a lot more clearer afterwards.

Please read the FAQ as it will also clarify the terminology.
 
Good day,

I have the same problem I am going to build an EV motorcycle, where the motor will draw 400 A peak current.
I have seen soms bms' with 19 channels (no 20 channel yet, which I need) but none of the bms' that I see have the ability to hold 400 A of current?

Am I doing something wrong or do I ask too much of a BMS?
 
MrDobby said:
Good day,

I have the same problem I am going to build an EV motorcycle, where the motor will draw 400 A peak current.
I have seen soms bms' with 19 channels (no 20 channel yet, which I need) but none of the bms' that I see have the ability to hold 400 A of current?

Am I doing something wrong or do I ask too much of a BMS?

Easy, don't put your loads "through" the BMS. Connect directly to your battery. Use an external limiter for current (ie, a fuse) to disconnect if overdriven. You aren't going to find an inexpensive BMS that can handle 100's of amps on either charge or discharge ports.
 
Back
Top