● 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.
● The solar inverter does not support full parallel connection for PV strings (full
parallel connection: PV strings connect to one another in parallel outside the
solar inverter and then connect to the solar inverter separately).
● During the installation of PV strings and the solar 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 solar inverter. The caused device damage is not
covered under any warranty.
● It is recommended that the positive and negative cables of PV strings be routed
in
dierent pipes to prevent short circuits and arcs due to cable damage during
construction.
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 congured, 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.
For example, if the number of input routes is 1–19, the DC input terminals are
selected as follows.
Number
of PV
Strings
Terminal Selection Number
of PV
Strings
Terminal Selection
1 Any even-numbered route 2 PV2 and PV10
3 PV2, PV10, and PV18 4 PV2, PV6, PV10, and PV18
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual 5 Electrical Connections
Issue 15 (2023-01-31) Copyright © Huawei Technologies Co., Ltd. 67
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