2 Product Description User Manual
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2.3 Technical Description
2.3.1 Circuit Diagram
Fig. 2-5 shows the main circuit of the inverter.
MPPT is utilized for DC input to ensure the maximum power from the PV array at
different PV input conditions.
Inversion circuit converts the DC power into AC power and feeds the AC power to
the utility grid through the AC terminal. The protection circuit is equipped to ensure
the device safe operation and personal safety.
DC switch is used to disconnect the DC current safely; inverter provides standard
RS485 ports for communication. User can check running data and set related
parameter through the LCD display.
Inversion circuit
LCD/RS485
DSP+CPLD
DC
L1
L2
L3
PE
L3
L2
L1
PE
DC
DC In
+ -
+ -
L1 L2 L3
DC EMI
Filter
DC bus
Inversion
circuit
AC
EMI
Filter
AC
Reactor
Relay
Junction box
Fan
DC SPD
DC
switch
DC fuse
Auxiliary
power circuit
Current detection
Fig. 2-5 Circuit diagram of SG80KTL
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