1. A maximum of one set of Y-branch connectors can be used for each MPPT.
2. The PV+ on the solar inverter side must be connected to the PV+ on the PV
string side, and the PV– on the solar inverter side must be connected to the
PV– on the PV string side.
3. Preferentially and evenly connect the Y-branch connectors to the MPPTs
controlled by DC SWITCH 2 or DC SWITCH 3.
Number
of Y-
branch
Connecto
r Sets
Recommended MPPT
to Be Connected
Number
of Y-
branch
Connecto
r Sets
Recommended MPPT
to Be Connected
1 MPPT9 2 MPPT7 and MPPT9
3 MPPT5, MPPT7 and
MPPT9
4 MPPT5, MPPT7, MPPT9,
and MPPT10
5 MPPT5, MPPT7, MPPT8,
MPPT9, and MPPT10
6 MPPT5, MPPT6, MPPT7,
MPPT8, MPPT9, and
MPPT10
7 MPPT1, MPPT5, MPPT6,
MPPT7, MPPT8, MPPT9,
and MPPT10
8 MPPT1, MPPT3, MPPT5,
MPPT6, MPPT7, MPPT8,
MPPT9, and MPPT10
9 MPPT1, MPPT2, MPPT3,
MPPT5, MPPT6, MPPT7,
MPPT8, MPPT9, and
MPPT10
10 MPPT1, MPPT2, MPPT3,
MPPT4, MPPT5, MPPT6,
MPPT7, MPPT8, MPPT9,
and MPPT10
Figure 5-21 Connecting Y-branch connectors to the PV strings
(recommended)
SUN2000-(100KTL, 110KTL, 125KTL) Series
User Manual 5 Electrical Connections
Issue 07 (2020-09-15) Copyright © Huawei Technologies Co., Ltd. 63
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