Main Functions; Operation Mode; Mode Change; Operation Mode Description - Sungrow SG3425UD System Manual

10 Main Functions

10.1 Operation Mode

10.1.1 Mode Change

After being energized, the inverter will switch among different modes as shown in the figure
below.
Upv is the DC input voltage of the inverter.
UpvStart is the DC side startup voltage of the inverter.

10.1.2 Operation Mode Description

Stop
This is the initial state of the inverter. The inverter DC load break switches are in the "OFF"
position; and the upstream and downstream connections are disconnected. The inverter is
therefore electricity-free.
Initial Standby
When switches of the upstream and downstream devices are closed and the DC switches,
DC load break switches of the inverter are in the "ON" position, the inverter turns to the
Initial Standby mode.
The inverter will continuously check if the PV array and the grid meet the grid-connection
requirements. If the inverter DC input voltage is higher than the inverter startup voltage, the
startup time is reached, and the requirements for the grid side parameter are satisfied, the
inverter will turn from the Initial Standby mode into the Startup mode.
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