8 Troubleshooting
Once a failure of string inverters occurs, fault lights will be illuminated. The current fault and fault ID can be viewed via
communication devices. Meanwhile the inverter will determine whether to shut down or not according to the alarm level.
Some common fault alarms and solutions are listed in the following table.
Definition of alarm level:
Important alarm: The inverter fails, enter shutdown mode and stop grid-connected power generation.
Prompt alarm: Some parts of the inverter fails, but the inverter still can make grid-connected power generation.
High voltage of
PV strings
Excessive number of PV panels
connected in serial results in output
overhigh voltage, finally causing
open-circuit voltage of PV strings
higher than maximum input voltage
of inverter.
Check whether the serial
connection configuration of PV
strings is excessive or not, it may
cause open-circuit voltage higher
than maximum input voltage of
inverter. If it is, adjusting the
string number configured is
required to drop output voltage of
PV strings to within specification
range. After adjusting properly,
the inverter will be restored to
work normally.
Input polarity is reversely connected
during installation.
Check whether the
corresponding anode and
cathode of inverter input is
connected reversely or not, if it
is, please adjust the polarity.
BOOST lightning
protection fault
BOOST lightening arrester is not
connected or damaged.
Check whether BOOST
lightening arrester is connected,
if not, connect it.
PV strings suffered long-term fixed
shelter and aging.
Check whether the PV string is
sheltered. If its surface is clean
and not sheltered, check if the
PV panel is damaged.
ISO insulation
impedance
abnormality
No power supply from power grid.
Check whether the power grid is
electriferous or not
Power grid voltage is over high
beyond allowable range.
Occasional occurrence may be
caused by short-term power grid
abnormality. After detecting
normal power grid, the inverter
will be restored to normal
operation without manual
intervention. If the problem
occurs frequently, please check if
power grid voltage is in the
allowable range, if not, please
contact local power operators, if
it is, revise the protection point
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