Number
of PV
Strings
Terminal Selection Number
of PV
Strings
Terminal Selection
17 PV1–PV8, PV10, PV12, and
PV14–PV20
18 PV1–PV8, PV10, and PV12–
PV20
19 PV1–PV10 and PV12–PV20 N/A N/A
Wiring Description of Y-branch Connectors
● Y-branch connectors can be purchased from Huawei or the manufacturers
based on the following recommended models: If the rated current of the fuse
of the Y-branch connector is 15 A, the recommended model is 904095944
(Luxshare) or A040959443039 (Comlink); if the rated current of the fuse of the
Y-branch connector is 20 A, the recommended model is 904095945 (Luxshare)
or A040959453039 (Comlink).
● Do not use Y-branch connectors that are not recommended.
● When connecting cables to recommended Y-branch connectors, ensure that the
connectors to be paired match each other and are from the same
manufacturer. Otherwise, the contact resistance of the connectors may exceed
the allowed value. In this case, the connectors may be heated and oxidized,
which may cause faults.
● When the Y-branch connector is used with the MC4 EVO2 contacts, you are
advised to use the 32.6020-22100-HZ (Staubli) crimping tool. You can also use
the PV-CZM-22100 (Staubli) crimping tool. When choosing PV-CZM-22100
(Staubli), do not use the locator. Otherwise, the metal contacts would be
damaged.
● Ensure that the locking nuts of all connectors are tightened.
● Do not bind more than three fuse enclosures together. Otherwise, the fuses and
their enclosures may be damaged due to overheating. It is recommended that a
clearance of 10 mm or more be reserved between fuse enclosures. You are
advised not to bind the fuse enclosures with other heat emitting conductors.
● Do not place the Y-branch connector harness on the ground. A safe distance
must be reserved between the Y-branch connector harness and the ground to
avoid impact caused by water on the ground to the harness.
● It is recommended that Y-branch connectors be connected from the PV string
side or connected to the solar inverter with a safe distance of at least 4 m and
bound to the PV support.
● The DC input terminals of the solar inverter are prone to damage under stress.
When Y-branch connectors are connected to the solar inverter, bind and secure
the connectors to prevent the DC input terminals from bearing stress. For
details, see A Securing Y-Branch Connectors.
Cable connection rules:
SUN2000-(100KTL, 110KTL, 125KTL) Series
User Manual 5 Electrical Connections
Issue 07 (2020-09-15) Copyright © Huawei Technologies Co., Ltd. 62
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