Function Description; Safety Function; Protection; Earth Fault Alarm - Sungrow SH8.0RT User Manual

Function Description

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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;
• the Ethernet communication port can be used for transmitting the alarm remotely.
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:
• over-temperature (including ambient temperature and module temperature)
• high input voltage
• grid under-voltage
• grid over-frequency
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