Product Introduction; 3�1 Intended Usage - Goodwe SMT Series User Manual

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Product introduction

3�1 Intended usage
The SMT series which is a Three MPPT, three phase transformer-less grid-connected inverter is a
crucial unit between the PV string and the utility grid in the PV power system.
Inverter is dedicated to converting directing current generated by the PV module into alternating
current, and feeding it into the utility grid, this conforms to parameters of the local utility grid.
The intended usage of inverter is illustrated in the below figure.
A
The DC input side of the inverter cannot be connected to a PV module where the
positive or negative terminal are already grounded, unless the AC side of the inverter
has been connected to the grid via a transformer.
Item Description
A PV string
B Inverter
C Meter device
D Utility grid
Note:
SMT series GW12KLV-MT, GW15KLV-MT, GW20KLV-MT, GW25K-MT, GW29.9K-MT, GW30K-MT, and
GW36K-MT support four different types(TN-S,TN-C,TN-C-S, TT) of grid.
TN-S
Transformer
Inverter
When neutral wire of inverter is not connected to grid, "Delta Grid" should be selected in grid
type(IT) setting page.
B
Monocrystalline silicon, polycrystalline silicon and else.
SMT Series.
Meter cupboard with distributed generation system.
TN-S, TN-C, TN-C-S, TT, IT (different Model types with different types of
utility grid as below) .
TN-C
Transformer
L1 L1
L2 L2
L3 L3
N PEN
PE
PE
PE
Inverter
Transformer
kW .H
C
Note
TN-C-S
Transformer Transformer
L1
L2
L3
N
PE
PE
Inverter
IT
L1
L2
L3
PE
Inverter
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D
TT
L1
L2
L3
N
PE
Inverter