Huawei SUN2000-40KTL-M3 - Page 59

WARNING
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 specications.
● The DC input voltage of the SUN2000-29.9KTL/30KTL/36KTL/40KTL-M3 shall
not exceed 1100 V DC under any conditions.
● The DC input voltage of the SUN2000-20KTL-M3 shall not exceed 800 V DC
under any conditions.
● The polarities of electrical connections must be correct on the DC input side.
The positive and negative terminals of a PV string must be connected 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 and 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.
WARNING
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 under any
warranty.
NO TICE
● The inverter does not support power supplies other than PV strings. The output
of the PV string connected to the inverter cannot be grounded. Ensure that the
PV module output is well insulated to ground.
● To ensure the optimal power generation of the system, the voltage dierence
between dierent MPPT circuits shall be less than 85 V.
Figure 5-12 DC input terminals
If the DC input terminals are not fully congured with PV strings, the DC input
terminals must meet the following requirements:
1. Evenly distribute the DC input power cables on the four MPPTs and
preferentially connect them from MPPT 1 to MPPT 4.
SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual 5 Electrical Connections
Issue 18 (2024-03-10) Copyright © Huawei Technologies Co., Ltd. 49