Alarm Name Cause Suggestions
Abnormal
output voltage
The optimizer
output voltage
is abnormal.
1. When the sunlight is normal, perform
optimizer search again.
2. Check the voltage of the corresponding
PV string. If the voltage is greater than 0
V, power o the system and check
whether the extension cable of the
abnormal optimizer is correctly
connected.
3. Check the voltage of the corresponding
PV string. If the voltage is 0 V, power
o
the system and check the cable
connection of the PV string. If there is an
open circuit, rectify the cable connection
of the PV string. If the polarity is
incorrect, reconnect the PV string in the
correct polarity. After the open circuit or
reverse polarity is
rectied, power on the
system and perform an optimizer search
again. If the alarm persists, check
whether the extension cable of the
abnormal optimizer is correctly
connected.
4. If the fault persists, contact your
installer.
Note : The polarity at both ends of the
extension cable must be opposite (one
end is a positive connector, and the
other is a negative connector). To
determine the PV string polarity, see ''3
Installing the Optimizer Cables'' in the
optimizer quick guide.
Upgrade failed
The optimizer
software
upgrade failed.
1. When the sunlight is normal, perform
the optimizer upgrade again.
2. If the fault persists, contact your
installer.
If the fault persists after all suggested measures listed above are completed, contact your
installer.
3.5 Replacing an Optimizer
Prerequisites
● Use dedicated insulation tools, and wear insulation shoes and protective
gloves before performing operations.
MERC Smart PV Optimizer
User Manual 3 System Maintenance
Issue 02 (2022-09-20) Copyright © Huawei Digital Power Technologies Co., Ltd. 14
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