LiFePO4 4S 12V 250A BT BMS/BT BMS（Fan）

Feature：

1)Over charge protection

2)Over discharge protection

3)Over current protection

4)Over heat protection

5)Short circuit protection

6)Waterproof

Specification：

Name：LiFePO4 4S 12V 250A BT BMS/LiFePO4 4S 12V 250A BT BMS（Fan）

Battery Type：Lifepo4

Norminal Voltage：3.2V

Constant discharge current：250A

Constant charge current：125A

Colour:RED

Material:metal

Bluetooth module：

specification:

Product name:  Bluetooth module

Color: as shown

Material: Plastic + Metal

Bluetooth module : available connect with Android and IOS App and can review the battery status in real time by mobile phone.

Product activation introduction：

For  our smart bms,when first use,need to activate first,then B- P- can be  conductive,voltage from P- can be same from B-, then BMS can work well.

Method ①: there is an activation switch on the board and click the button.

Method ②: Press thebuttonon the bluetooth module to activate the bms directly.

Method ③: Charge activation, B-line must be connected to the total negative pole of the battery pack when

Pls refer to following link to understand bluetooth set up by APP.

https://www.dalyelec.cn/newsshow.php?cid=24&id=74&lang=1

The package includes:

1*4S 12V 250A BT BMS /BT BMS（Fan）

1*Cable

1*NTC Temperature Sensor

1*Bluetooth module

FAQ

Q: How do I know what material OR type my battery is ?
A:  Please look the battery body,if the normal voltage of your battery  shows 3.2V,the battery is LiFePo4.If the normal voltage of your battery  shows 3.6V or 3.7V, the battery is Li-ion or Li-polymer battery, You can  also ask battery manufacturer for the material of battery.

Q: Is this BMS suit for my battery?
A: This BMS suit your battery or not depends on below 2 points: 
How many series you cell is in your battery pack? The BMS you buy must be same series as your battery pack.
What  material your battery is? Only the LiFePo4 battery has different  electric parameter from other battery, so if you need buy the BMS for  LiFePo4, Please let us know firstly.

Q: What is the Common port and Separate port? what is the difference?
A: We take 13S 48V16A BMS as example: 
Common  port 16A means your charge cathode and discharge cathode are connected  in the same point end (our P-),  charge cathode and discharge cathode  are used in the common connection port, so the charge current and  discharge current are same as 16A. 
Separate port is separately  connected by charge cathode (our C-) and discharge cathode (our P-), so  the charge current and discharge current are different, discharge  current is 16A, charge current is 8A.

Q: What is the balance function?Do we need cell balance or not?
A: The working principle and function are as followings:
When  your one cell voltage was reached balance voltage(Li-ion 4.18V, LifePo4  3.6V), that cell balance start work, balance resistance starts  discharge with 35mA, that cell was in both charging and discharging  status, and other cells were not reached balance voltage(Li-ion 4.18V,  Life Po43.6V), so they are only in charging status, when the fast cell  voltage was reached overcharge voltage (Li-ion 4.25V, Life  Po4 3.75V),BMS starts off power protection, all the cells are stop  charging, this process will enable your battery charging in balance  current, and your battery voltage are in balance status.
However, if  your cell voltage difference are in a big range, The equilibrium effect  is almost zero,The solution is to replace cells with large voltage gaps.

Q: The relationship between battery capacity(AH or mAH) and BMS current(A)?
A:There is  no direct relationship between battery capacity and BMS current, big  capacity doesn't mean big current, but rely on continue current, that is  to say if your engine is powerful, you should choose high current of  BMS, it is not relied on battery capacity.
 
Q: What type of charger should i choose?
A:  Lithium battery must choose specific charger, don't use charger for  leadacid battery, for leadacid charger may have MOS with high pressure  breakdown protection, which will not protect of BMS over charge. LiFePo4  battery charger voltage = number of battery strings X 3.6V, while  Li-ion battery charger voltage = number of battery strings X 4.2V.
 
Q: What current BMS should I choose ?
A: Take 10S 36V as example: 
What  current BMS you choose is depend on your E-bicycle motor power and  current limitation of controller,eg.16A for 350W and below, 25A for 500W  and below, 35A for 800W and below, 60A for 1000W and below,  over 1200W  are contact with our service specialist for suggestion, continue  current shall be higher than current limitation in controller.

 
Q: How to contact for BMS?
A: Please send messages at below or E-mail us and we are always glad to help you with BMS.