Number
of PV
Strings
Terminal Selection Number
of PV
Strings
Terminal Selection
1 PV1 2 PV1 and PV7
3 PV1, PV3 and PV7 4 PV1, PV3, PV5 and PV7
5 PV1, PV2, PV3, PV5 and
PV7
6 PV1, PV2, PV3, PV5, PV7
and PV8
7 PV1, PV2, PV3, PV4, PV5,
PV7 and PV8
8 PV1, PV2, PV3, PV4, PV5,
PV6, PV7 and PV8
5.5.2 Connecting Cables to Amphenol Helios H4 Connectors
Use the positive and negative Amphenol Helios H4 metal terminals and DC
connectors supplied with the solar inverter. Using incompatible positive and
negative metal terminals and DC connectors may result in serious consequences.
The caused device damage is not covered under any warranty.
● You are advised to use the H4TC0003 (Amphenol) crimping tool and do not use
it with the positioning block. Otherwise, the metal terminals may be damaged.
● The H4TW0001 (Amphenol) open-end wrench is recommended.
● Cables with high rigidity, such as armored cables, are not recommended as DC
input power cables, because poor contact may be caused by the bending of the
cables.
● Before assembling DC connectors, label the cable polarities correctly to ensure
correct cable connections.
● After the positive and negative connectors snap into place, pull the DC input
cables back to ensure that they are connected securely.
● If the SUN2000 is used with an optimizer, the number of optimizers for a single
PV string cannot exceed 25.
● If the PV string is
congured with an optimizer, check the cable polarity by
referring to the smart PV optimizer quick guide.
Procedure
Step 1 Connect the DC power cable.
SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual 5 Electrical Connections
Issue 11 (2023-01-10) Copyright © Huawei Technologies Co., Ltd. 46
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