46
User Manual
MHT-4~20K series
5.6.1 PV Side Requirements
System Layout of Units with external DC Switch
①
Local standards or codes may require that PV systems are fitted with an external DC
switch on the DC side. The DC switch must be able to safely disconnect the open-circuit
voltage of the PV array plus a safety reserve of 20%. Install a DC switch to each PV string to
isolate the DC side of the inverter.
②
The DC switch has to be certified by AS 60947.3:2018 and AS/NZS IEC 60947.1:2020 in
Australia and New Zealand market. The Max. current of the DC switch matched by MHT-
4~20K inverter is no less than 40A. We recommend the following electrical connection.
Figure 5-29
Select the appropriate photovoltaic cable
Cable requirements
Cable stripping length
Outside diameter
Conductor core section
5.9-8.8 mm
4 mm²
7 mm
DC Swi
tch
PE
PE
L3
N
To grounding electrode
--
+
++
AC Br
eaker
DC INPUT AC OUTPUT
L2
L1
Grid
+
++ + +
5.6.2 Assembling the PV Connector
①Before assembling the DC connector, make sure that the cable polarity
is correct.
② Use a multimeter to measure the voltage of the DC input string, verify
the polarity of the DC input cable, and ensure that each string voltage is
within 1000V.
WARNING
Содержание MHT-10K-25
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