Figure 5-15 DC terminals controlled by DC SWITCH 2
Requirements for selecting DC input terminals:
1. DC input terminal PV10 must be connected to a PV string.
2. At least one PV string is connected to the DC input terminals PV1–PV9.
3. It is recommended that DC input terminals be evenly distributed on MPPTs.
4. If 210 mm PV modules are used, a maximum of four PV strings can be
connected to each MPPT.
For example, if there are 18 to 27 PV strings, you are advised to connect DC input
terminals as follows:
Numbe
r of PV
Strings
Terminal Selection Numbe
r of PV
Strings
Terminal Selection
18 Connect to PV2–PV4, PV7–PV12,
PV16–PV18, PV21–PV23, and PV26–
PV28.
19 Connect to PV2–PV4, PV6–PV12,
PV16–PV18, PV21–PV23, and PV26–
PV28.
20 Connect to PV2–PV4, PV6–PV12,
PV16–PV18, PV21–PV23, and PV25–
PV28.
21 Connect to PV2–PV4, PV7–PV13,
PV16–PV18, PV20–PV23, and PV25–
PV28.
SUN2000-(250KTL, 280KTL, 300KTL, 330KTL) Series
User Manual 5 Electrical Connections
Issue 07 (2023-06-30) Copyright © Huawei Technologies Co., Ltd. 56
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