Sungrow SG1K5TL-31, User Manual

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Product Introduction
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11
2.2
Principle Description
The principle design of the SG1K5TL-31--a transformer-less and grid-connected
inverter can be known from the block diagram Fig 2-2.
The PV array voltage connected to the inverter input is always positive and is initially
regulated by the Boost circuit and then converted into alternating current by the full
bridge circuit inverter. The AC connection to the local utility grid is via 3 wires for a
single phase feed point.
Additionally, there is a MPP tracker to ensure that maximum power from PV array can
be utilized. Inside the inverter protective circuit to can trigger AC relay if required for
guaranteeing inverter safely operation and person.
Inverter provides standard interface RS485 for communication. User can look up
running data and configure parameters through human-computer interaction interface
--LCD display panel.
Fig 2-2 Main Circuit Diagram of SG1K5TL-31