Ensure that the following conditions are met. Otherwise, the inverter may be
damaged or even a re may occur.
● PV modules connected in series in each PV string are of the same specications.
● The maximum open-circuit voltage of each PV string must be lower than or
equal to 1100 V DC under any circumstances.
● The maximum short-circuit current of each PV string must be lower than or
equal to 20 A under any circumstances.
● The polarities of electric connections are correct on the DC input side. The
positive and negative terminals of a PV string connect to corresponding positive
and negative DC input terminals of the inverter.
● If a DC input power cable is reversely connected, do not immediately operate
on the DC SWITCH or positive/negative connectors. Wait until the night when
solar irradiance declines and the PV string current drops to below 0.5 A. Then
set the DC SWITCH to OFF, remove the positive and negative connectors, and
correct the polarities of the DC input power cable.
● The output of the PV string connected to the inverter cannot be grounded.
Ensure that the PV module output is well insulated to ground.
● The PV strings connected to the same MPPT circuit should contain the same
number and model of PV modules or optimizers.
● During the installation of PV strings and the inverter, the positive or negative
terminals of PV strings may be short-circuited to ground if the power cables are
not properly installed or routed. In this case, an AC or DC short circuit may
occur and damage the inverter. The resulting device damage is not covered by
the product warranty.
Terminal Description
Figure 5-11 DC input terminals
SUN2000-(12K-25K)-MB0 Series
User Manual 5 Electrical Connections
Issue 01 (2023-04-30) Copyright © Huawei Digital Power Technologies Co., Ltd. 46
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