SUN2000-(175KTL-H0, 185KTL-INH0, 185KTL-H1)
User Manual
5 Electrical Connections
Issue 02 (2019-06-05)
Copyright © Huawei Technologies Co., Ltd.
38
Ensure that the PV module output is well insulated to ground.
The PV strings connecting to the same MPPT circuit should contain the same number of
identical PV modules.
During the installation of PV strings and the inverter, the positive or negative terminals of
PV strings may be short-circuited to ground if the power cable is not properly installed or
routed. In this case, an AC or DC short circuit may occur and damage the inverter. The
caused device damage is not covered under any warranty.
Terminal Description
The inverter provides 18 DC input terminals, which are controlled by its three DC switches.
DC SWITCH 1 controls DC input terminals 1–6, DC SWITCH 2 controls DC input terminals
7–12, and DC SWITCH 3 controls DC input terminals 13–18.
Figure 5-11
DC terminals
Requirements for selecting DC input terminals:
1.
Evenly distribute the DC input power cables on the DC input terminals controlled by the
three DC switches.
2.
Maximize the number of connected MPPT circuits.
3.
When the DC input is not fully configured, give preference to even-numbered DC input
terminals.
Cable Specifications
Cable Type
Conductor
Cross-sectional Area
(Unit: mm
2
)
Cable Outer Diameter
(Unit: mm)
PV cable that meets the
1500 V standard
4–6
4.7–6.4
Cables with high rigidity, such as armored cables, are not recommended, because poor contact
may be caused by the bending of cables.
