2 Product Introduction User Manual
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2.3 Technical Description
2.3.1 Principle Description
The principle design of transformer-less and grid-connected inverter is illustrated in
Fig. 2-5.
Six PV strings input voltage is transmitted to DC BUS via Boost circuit.
SG10/12/15/20KTL inverters are equipped with MPPTs for two DC inputs to ensure
that the maximum power can be utilized even in different PV installation conditions.
Three-level inverter circuit converts the DC power into AC power, which will be fed
into the utility grid via five core terminals. Protective circuits are designed to
guarantee inverter safe operation and human safety.
A DC switch is integrated for safe disconnection of DC current. The inverter provides
standard interface RS485 for communication. Inverters are also provided running
records display and parameters configuration via human-computer interface –LCD
display panel.
Fig. 2-5 Main Circuit Diagram of Inverter
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