Sungrow SG125HV, User Manual

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2 Product Description
2.1 Intended Usage
SG125HV/SG125HV-20; a transformerless three-phase PV grid-connected
inverter, is an integral component in the PV power system.
The inverter is designed to convert the direct current power generated from the
PV modules into grid-compatible AC current and feeds the AC current to the
utility grid. The intended usage of the inverter is illustrated in Fig. 2-1.
Inverter cannot connect the PV strings whose positive and negative
terminals need to be grounded.
Do not connect any local load between the inverter and the AC circuit
breaker.
Inverter is applicable only to the grid-connected PV system. Any other
usage is strictly forbidden.
A D B E
C
Fig. 2-1 Inverter application in PV power system
Item Description Note
A PV strings
Monocrystalline silicon, polycrystalline silicon, and
thin-film without grounding
B Combiner Box Combine the DC current of several PV string inputs
C Inverter SG125HV/SG125HV-20
D Transformer
Convert the inverter output low-voltage AC voltage
into the grid-compatible medium-voltage level.
E Utility grid TN-C, TN-S, TN-C-S, TT, IT
The following figure shows the common grid configurations.