ID
Name
Severity Cause
Solution
are combined or
exchanged.
● Cause ID = 8
The sunlight is weak or
changes abnormally.
● Cause ID = 9
In partial configuration
scenarios, the PV string
voltage exceeds the
inverter input voltage
specifications.
parallel under the same
MPPT is the same.
2. Check whether the
optimizer output extension
cable is correct (positive
connector at one end and
negative connector at the
other).
● Cause ID 7: When the
sunlight is normal, perform
the optimizer search function
again.
● Cause ID 8: When the
sunlight is normal, perform
the optimizer search function
again.
● Cause ID 9: Calculate the PV
string voltage based on the
number of PV modules in the
string and check whether the
string voltage exceeds the
upper threshold of the
inverter input voltage.
2081
Optimize
r fault
Warning Cause ID = 1
The optimizer is offline or
faulty.
Go to the optimizer information
screen to view the fault details.
2082
Grid-tied/
Off-grid
Controlle
r
Abnorma
l
Major
Cause ID = 1
The inverter fails to
communicate with the
Smart Backup Box.
Cause ID = 2
An unrecoverable fault
occurs on a circuit inside
the Smart Backup Box.
1. Send a shutdown command
on the app. Turn off the AC
output switch, DC input
switch, and battery switch.
2. Check whether the power
cable and RS485 cable
between the Smart Backup
Box and the inverter are
normal.
3. After 5 minutes, turn on the
battery switch, AC output
side, AC output switch, and
DC input switch.
4. If the alarm persists, contact
your dealer or Huawei
technical support.
SUN2000-(3KTL-10KTL)-M1
User Manual
8 Maintenance
Issue 02 (2020-11-20)
Copyright © Huawei Technologies Co., Ltd.
94
