Main Functions; Operation Mode; Mode Change; Operation Mode Description - Sungrow SG3125HV-20 System Manual

11 Main Functions

11.1 Operation Mode

11.1.1 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.

11.1.2 Operation Mode Description

S S t t o o p p
This is the initial state of the inverter. The inverter DC switches and AC circuit breaker are
in the "OFF" position; and the upstream and downstream connections are
disconnected. The inverter is therefore electricity-free.
I I n n i i t t i i a a l l S S t t a a n n d d b b y y
When switches of the upstream and downstream devices are closed and the DC
switches, AC circuit breaker of the inverter are in the "ON" position, the inverter turns
to the I I n n i i t t i i a a l l S S t t a a n n d d b b y y 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
89