● Do not connect loads between an inverter and an AC switch that directly
connects to the inverter. Otherwise, the switch may trip by mistake.
● If an AC switch is used with specications beyond local standards, regulations,
or the Company's recommendations, the switch may fail to turn o in a timely
manner in case of exceptions, causing serious faults.
● Do not open the panel of the SUN2000.
● Before opening the maintenance compartment door, ensure that no electrical
connections are made for the SUN2000 on the AC or DC side.
● Do not open the maintenance compartment door on rainy or snowy days. If
you need to, take protective measures to prevent rain or snow from entering
the maintenance compartment. If protective measures cannot be taken, do not
open the maintenance compartment door.
● Do not leave unused screws in the maintenance compartment.
Each inverter shall be equipped with an AC output switch. Multiple inverters shall
not connect to the same AC switch.
● The distance between each SUN2000 and the AC combiner box or the low-
voltage cabinet of the transformer station must be at least 10 m, or the total
distance between two adjacent SUN2000s and the AC combiner box or the
low-voltage cabinet of the transformer station must be at least 20 m.
● The cable outer diameter can be measured using the ruler sticker in the
maintenance compartment.
● Ensure that the cable jacket is in the maintenance compartment.
● Ensure that the AC output power cables are connected securely and insulated
properly (using three-way breakout boots and cold/heat shrink tubing).
Otherwise, the SUN2000 may fail to operate, or become overheated during
operation due to an unreliable connection, which will damage the terminal
block. The resulting device damage is not covered by the warranty.
● In the quick scheduling scenario with MBUS communication networking,
connect AC power cables in the maintenance compartment from left to right in
the sequence of L1, L2, and L3.
SUN2000-(250KTL, 280KTL, 300KTL, 330KTL) Series
User Manual 5 Electrical Connections
Issue 07 (2023-06-30) Copyright © Huawei Technologies Co., Ltd. 46
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