Step 6 Use an insulation resistance tester to test the insulation resistance between the
PV– cables and the ground: Add 1500 V DC voltage between the PV– cables and
the ground and check the insulation resistance.
● If the insulation resistance is greater than or equal to 1 MΩ, it is normal.
● If the insulation resistance is less than 1 MΩ, troubleshoot the cable
insulation.
Figure 5-21 Testing the insulation resistance
You can use a self-made tool to connect all PV– cables together through an adapter to
test the insulation resistance between all PV– cables of a device and the ground at a
time.
Figure 5-22 Testing the insulation resistance between all PV– cables and the
ground
Step 7 Insert the positive and negative connectors into the corresponding DC positive and
negative input terminals of the solar inverter.
SUN2000-(100KTL, 110KTL, 115KTL)-M2
User Manual 5 Electrical Connections
Issue 07 (2023-04-30) Copyright © Huawei Technologies Co., Ltd. 63
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