Sungrow SG250HX-US, User Manual, Page: 20 / 106

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• The inverter circuit converts the DC power into grid-compliant AC power and feeds it into
the grid.
• The AC filter filters the output AC component of high frequency to ensure that the output
current meets the grid requirements.
• The AC relay isolates the AC output of the inverter from the grid, making the inverter safe
from the grid in case of inverter failure or grid failure.
• The AC SPD provides a discharge circuit for the AC side over-voltage power to prevent it
from damaging the internal circuits of the inverter.
2.6 Function Description
The inverter is equipped with the following functions:
Conversion Function
The inverter converts the DC into grid-compatible AC and feeds the AC into the grid.
Data Storage and Display
The inverter logs system information like running information, error records, etc.
Parameter Configuration
The inverter provides various parameter configurations. Users can set parameters via the
App to meet different needs and optimize the inverter performance.
Communication Interface
The inverter is designed with standard RS485 communication interfaces.
The standard RS485 communication interfaces are used to establish communication with
monitoring devices and to upload monitoring data to a monitoring background through com-
munication cables.
When communication is established between the inverter and the communication devices,
users can view inverter information or set inverter parameters, such as running parameter
and protection parameter, through the iSolarCloud.
Protection Function
The inverter is equipped with anti-island protection, LVRT/HVRT, DC reversed polarity pro-
tection, AC short circuit protection, leakage current protection, DC over-voltage/over-current
protection, etc.
Potential Induced Degradation (PID)
The PID effect (Potential Induced Degradation) of PV modules will cause serious damage to
PV yield. Anti-PID function applies to the grid-connected operation of the inverter during the
day or the reactive power generation at night while the PID repair function applies to the off-
grid operation of the inverter at night.
Anti-PID function and PID repair function works differently when applied to P-type and N-
type panels.
• P-type panel
2 Product Description User Manual