Huawei SUN2000-75KTL Series User Manual page 77

SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual
● Ensure that the PV module output is well insulated to ground.
● The PV strings connecting to the same MPPT circuit should contain the same
● The solar inverter does not support full parallel connection for PV strings (full
● During the installation of PV strings and the solar inverter, the positive or
● It is recommended that the positive and negative cables of PV strings be routed
Terminal Description
The solar inverter has 20 DC input terminals. DC SWITCH 1 controls PV1–PV8
(MPPT1–MPPT4), DC SWITCH 2 controls PV9–PV14 (MPPT5–MPPT7), and DC
SWITCH 3 controls PV15–PV20 (MPPT8–MPPT10).
Figure 5-21 DC terminals
When the DC input is not fully configured, the DC input terminals must meet the
following requirements:
1.
2.
For example, if the number of input routes is 1–19, the DC input terminals are
selected as follows.
Number
of PV
Strings
1
3
Issue 15 (2023-01-31)
NO TICE
number of identical PV modules.
parallel connection: PV strings connect to one another in parallel outside the
solar inverter and then connect to the solar inverter separately).
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 solar inverter. The caused device damage is not
covered under any warranty.
in different pipes to prevent short circuits and arcs due to cable damage during
construction.
Evenly distribute the DC input power cables on the DC input terminals
controlled by the three DC switches. DC SWITCH 1 is preferred.
Maximize the number of connected MPPT circuits.
Terminal Selection
Any even-numbered route
PV2, PV10, and PV18
Copyright © Huawei Technologies Co., Ltd.
5 Electrical Connections
Number Terminal Selection
of PV
Strings
2 PV2 and PV10
4 PV2, PV6, PV10, and PV18
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