46
User Manual
MHS-3~8K
series
5.6.1 PV Side Requirements
System Layout of Units with external DC Switch
①
Local standards or codes may require PV systems that fit 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 matching with MHS-
3~8K 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
5.6.2 Assembling the PV Connector
Before assembling the DC connector, make sure that the cable polarity is
correct.
WARNING
-
+
To ground electrode
DC Switch
DC Input
AC Output
PE
AC Breaker
PE
PE
L
N
Grid
