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Function Description
3
3.1
Safety Function
3.1.1 Protection
Several protective functions are integrated in the inverter, including short circuit protection,
grounding insulation resistance surveillance, residual current protection, anti-islanding pro-
tection, DC overvoltage / over-current protection, etc.
3.1.2 Earth Fault Alarm
The inverter has integrated a multiple-function dry-contact (DO relay), which can be used for
the external alarm for earth fault. The external alarm needs to be powered by the grid.
The additional equipment required is a light indicator and/or a buzzer.
If an earth fault occurs:
•
the DO dry-contact will switch on automatically to signal the earth fault alarm;
•
the buzzer inside the inverter will also beep;
•
An earth fault alarm signal will be uploaded.
3.2
Energy Conversion and Management
The inverter converts the DC power from the PV array or the battery to the AC power, in con-
formity with the grid requirements. It also transmits the DC power from the PV panel to the
battery.
With the bidirectional converter integrated inside, the inverter can charge or discharge the
battery.
Multiple string MPP trackers are used to maximize the power from PV strings with different
orientations, tilts, or module structures.
3.2.1 Power Derating
Power derating is a way to protect the inverter from overload or potential faults. In addition,
the derating function can also be activated following the requirements of the utility grid. Sit-
uations requiring inverter power derating are:
3.2.2 DRM ("AU"/"NZ")
The inverter provides a terminal block for connecting to a demand response enabling device
(DRED). The DRED asserts demand response modes (DRMs). The inverter detects and ini-
tiates a response to all supported demand response commands within 2s.
The following table lists the DRMs supported by the inverter.
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