Sungrow SH3K6 - Energy Conversion and Management

3 Function Description User Manual
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3.2 Energy Conversion and Management
The inverter converts the DC power from the PV array or the battery to the AC
power, which conforms to 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.
Two string MPP trackers can be utilized 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 by the requirements of
the utility grid. Situations requiring inverter power derating are:

grid dispatching;

over-temperature (including ambient temperature and module temperature);

grid under-voltage;

export power limit setting; and

power factor.
Grid Dispatching Derating
Adjust the output power according to the remote scheduling instructions and the
inverter operates with the power derating.
Over-temperature Derating
A high ambient temperature or poor ventilation will lead to a power derating of
the inverter.
When the internal temperature or module temperature exceeds the upper limit,
the inverter will reduce the power output until the temperature drops within the
permissible range.
Grid Under-voltage Derating
When the grid voltage is too low, the inverter will reduce the output power to
make sure that the output current is within the permissible range, as calculated
by the following equation.
When Vmin < V < 230 V, P = Pn ×(V
grid
/ 230 V)