EJ-BC21 Battery monitor

//EJ-BC21 Battery monitor
EJ-BC21 Battery monitor 2018-04-27T03:47:21+00:00

Project Description

EJ-BC21 is a kind of high precision current type battery capacity tester(also known as coulometer).

Testing the voltage,current and capacity of the battery, to help users know the state of the battery in time.

EJ-BC21 has a memory function.

It is suitable for mobile and portable equipments、e-bike、balance cars、cleaning machines、instruments、ups and so on.


● Application:
EJ-BC21 is suitable for lithium batteries, lithium iron phosphate batteries, lead-acid batteries and nickel-metal
hydride batteries which working voltage is from 8V to 80V.
● Working interface description:

  
● Connect:
We need a shielded wire and an ordinary wire (0.3-0.75 mm²).One end of the ordinary wire connects to positive of
battery, another end connects to B+ of the sampler (anyone is ok). The B- of sampler connects to B- of the battery. P- of sampler
connect to P- of output. Finally, connect sampler to coulometer by the shielded wire.(Notice: The diagram is not equal proportion)
Connection diagram of 50A sampler:

Connection diagram of 100A/350A sampler:

Attention: Please connect as shown strictly. The sampler must be connected to the negative circuit, it is forbidden to
connect to the positive circuit. If you want to extend the shielded wire,  you must use 4 lines of the same specification.
● Install:
First,open around holes of 54.5mm on the panel of the equipment. Then install the coulometer from the front of the
panel. Finally,tighten the bracket on the back. As shown below:

● Using steps:
1. Connect and check the current:Power on after complete the connection as shown,

the screen should display capacity
percentage. If the screen has no response,please check the connection.
Then charge or discharge the battery, and check
whether the display current is equal to the actual current. If the deviation is large please check the connection.
2.Capacity reset:On first use,the percentage and capacity are not the actual value,you should reset the capacity:discharge
the battery totally and hold the“ ”key for 3 seconds to set the capacity zero or charge the battery fully and hold the“ ”key for
3 seconds to set the capacity full. And it doesn’t need to do this again later, except replace the battery.
3.Check and reset the actual capacity: If you find the display capacity doesn’t match the actual capacity,please check and reset
the actual capacity:discharge the battery totally and hold the “ ”key for 3s to set the capacity zero,then set the capacity
value as large as possible. Then charge the battery fully,and the display capacity is the actual capacity. Finally set the display
capacity as preset capacity (Please refer to use and setting).

●Other description:
1. When charging or discharging,the coulometer must be at work. Otherwise, the capacity will not be accurate.
2. Connect the load,when the discharge current is higher 
than backlight on current, the backlight on (if backlight blinking,
the RS+ and RS- are inverse), and display discharge indicator, indicate the battery is discharging.

3. Break the load,and connect the charger. When the charge current is higher than backlight on current,backlight blinking (if
backlight on,the RS+ and RS- are inverse), and display charge indicator, indicating the battery is charging.


4. When the charge or discharge current is less than backlight off current, coulometer enters a low power state and backlight off.
And EJ-BC21 can memory the capacity.
5. Because of high sensitivity,when the coulometer is in standby mode (battery has no input or output current),if it is
interfered by electromagnetic radiation (open or close inductive loads,such as the motor) nearly,the backlight will shortly open.
6. When the current changes frequently the date acquisition may produce error,and it will affect the accuracy

● Use and setting:
Change display interface:
After power on, display capacity percentage. Click“ ”key, display voltage; click“ ”key, display capacity, click“ ”key
again, display current; click“ ”key, display percentage.

Preset capacity and voltage setting:
1. Under voltage display, press the“ ”key for 3s to enter 
zero capacity voltage setting. The set bit flicker, click the“ ”or
”key to plus and minus the value, then press the“ ”key to complete setting. When the voltage is lower than the value the
percentage will be 0%,and backlight off.
2. Under capacity display, press the“ ”key for 3s to enter the capacity setting. The set bit flicker, click the“ ”or“ ”key to
plus and minus the value, then press the“ ”key to complete set.

Note:Generally the zero capacity voltage does not need to set.
The default is 0V,  mean invalid. If you want to set,  please understand the actual charge and discharge voltage of battery
firstly.
Set capacity zero or full:
When on first use or change the battery,  the memory capacity should be set zero or full: In the main interface,hold the
”key for 3 seconds to set the capacity zero,the percentage is 0;hold the“ ”key for 3 seconds to set the capacity full,
the percentage is 100. The attention that the operations cannot be restored.
● Attention and warranty:
The tester cannot be exposed in the sun for a long time or in the environment with large amounts of ultraviolet radiation
when using or storing,particular in winter (<-20℃) and summer (>60℃),otherwise it will shorten the life of LCD.
Within one year,any fault caused by non-artificial reason, we should maintain it freely.

Parameter
Min
Type
Max
Unit
Working voltage
8.0
80.0
V
Working dissipation
10.0
12.0
mA
Standby dissipation
0.5
0.8
mA
Sleep dissipation
50.0
60.0
uA
Capacity accuracy
±2.0
Voltage accuracy
±2.0
Current accuracy
±2.0
%
Backlight on current
40.0
50.0
mA
Backlight off current
30.0
40.0
mA
Preset capacity value
0.1
999.0
Ah
Current of 50A Sampler
50.0
75.0
A
Temperature range
0
20
35
Weight
70.0
g
Size
ø59*20
mm

Parameter
Min
Type
Max
Unit
Working voltage
8.0
80.0
V
Working dissipation
10.0
12.0
mA
Standby dissipation
0.5
0.8
mA
Sleep dissipation
50.0
60.0
uA
Capacity accuracy
±1.0
Voltage accuracy
±1.0
Current accuracy
±1.0
%
Backlight on current
40.0
50.0
mA
Backlight off current
30.0
40.0
mA
Capacity setting value
0.1
590
Ah
Sampler working current
150.0
A
Temperature range
0
20
35
Weight
135.0
g
Size
ø59*20
mm

waterproof battery monitor with 100A shunt

Parameter
Min
Type
Max
Unit
Working voltage
8.0
80.0
V
Working dissipation
10.0
12.0
mA
Standby dissipation
0.5
0.8
mA
Sleep dissipation
50.0
60.0
uA
Capacity accuracy
±1.0
Voltage accuracy
±1.0
Current accuracy
±1.0
%
Backlight on current
40.0
50.0
mA
Backlight off current
30.0
40.0
mA
Capacity setting value
0.1
999
Ah
Sampler working current
50.0
500.0
A
Temperature range
0
20
35
Weight
65.0
g
Size
ø59*20
mm