B
attery
-Box LV User Manual
Page 10
To make sure that the system can be operated normally, please use BYD compatible
inverters and select battery quantity correctly, according to
the “B-Box configuration list
with different inverter
” in Appendix 1 in this user manual.
8 Common Issues and Solutions
8.1Alarm
indicated on the BMU and the solution
LED of the BMU
Possible cause
Solution
Flash 1 time
Inverter and BMU communication
failure
step1. Check whether the CAN
communication cable has been connected
correctly and
tightly
；
step2. If the connection is incorrect, please
reconnect the cable correctly; if the
connection is correct and reliable, then
replace the BMU
；
Flash 2 times
Battery not found
Check the connection between BMU and
first battery.
Flash 3 times
Any of batteries are disconnected
1.
Check RS485 cable and battery
address
2.
If the connection and the address are
correct, please contact the after service
provider
Flash 4 times
Any of battery failures
Check battery led status. If the red led is on
and buzzer alarms, please contact your
after service provider to replace the battery.
8.2 Alarm displayed on B-Plus 2.5 and the solution
Alarm indicated by flashing LED
Info B-Plus displayed
Flash
Possible cause
Solution
Only yellow led is ON
0.5Hz
Battery was powered off
abnormally;
Press ON/OFF button for 2-3
seconds to restart the battery, If
the battery cannot be
recovered, contact the after
service provider immediately;
Flow led flashes and
alternates with capacity led
10s per
cycle
Communication
connection timeout
Step1.Check the
communication wire/cable
Step2.check battery address
NO.1/3 led and No.2/4 led
flashing alternately
/
Update statue status
If the firmware is not updated,
then reset the battery.
Alarm indicted by flashing yellow Led
