Installing Dc Input Power Cables - Huawei SUN2000 Series Quick Manual

4.7

Installing DC Input Power Cables

Selecting DC Input Terminals
When the DC inputs are not fully configured, the DC input terminals must meet the following
requirements:
1. Evenly distribute the DC input power cables on the DC input terminals controlled by the three
DC switches. DC SWITCH 1 is preferred.
2. Maximize the number of connected MPPT circuits.
Ensure that the PV module output is well insulated to ground.
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.
•
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.
•
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.
12