Function Description; Safety Function; Protection; Earth Fault Alarm - Sungrow SH3.0RS User Manual

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 device gives an alarm if there is a grounding fault. If the AC side is poorly grounded or
not grounded, the buzzer rings, and the LED indicator turns red.
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-voltage
• grid over-frequency
• power factor (when values out of the rated values)
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