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Alarm
Cause
Optimizer input
Input overvoltage
overvoltage
occurred.
The optimizer
internal
Overtemperature
temperature is too
protection
high.
An internal fault
Internal
occurred in an
hardware fault
optimizer.
The output
terminal
Output terminal
temperature of
overtemperature
some optimizers is
abnormal.
Optimizer output
Output backfeed
backfeed occurred.
The optimizer
Abnormal output
output voltage is
voltage
abnormal.
The optimizer
Upgrade failed
software upgrade
failed.
Suggestion
Check whether the open-circuit voltage of the PV module
exceeds the maximum input voltage of the optimizer.
1. Check the ventilation and ambient temperature at the
optimizer installation position. If the ventilation is poor
or the ambient temperature exceeds the upper
threshold, improve the ventilation and heat dissipation.
2. If the ventilation and ambient temperature are normal,
contact your installer.
Contact your installer.
Contact your installer to replace the faulty optimizer and
the optimizer connected to the short output cables of the
faulty optimizer.
1. Check whether PV modules are shaded when PV
strings are connected in parallel.
2. If the fault persists, contact your installer.
1. When the irradiance is normal, perform optimizer
search again.
2. Check the voltage of the corresponding PV string. If
the voltage is greater than 0 V, power off 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 off 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 rectified, 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."
1. When the irradiance is normal, perform the optimizer
upgrade again.
2. If the fault persists, contact your installer.
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