● 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.
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 5-19 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. The even-numbered PV terminals are preferred to maximize the connections
of MPPTs.
3. If the number of PV inputs is 11 to 19, connect cables to the odd-numbered
PV terminals from PV1 and PV19, and avoid connections to adjacent MPPTs if
possible.
If the number of PV inputs is 11 to 19, the DC input terminals are selected as
follows.
SUN2000-(100KTL, 110KTL, 115KTL)-M2
User Manual 5 Electrical Connections
Issue 07 (2023-04-30) Copyright © Huawei Technologies Co., Ltd. 61
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