6 Planning the installation
Installation and Operating Manual for RPI M15A M20A Solar Inverter V1.0 2016-03-18
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6.8.5 Connecting the DC strings to the DC inputs
Check the polarity of the DC voltage before connecting the solar modules to the inverter.
The negative terminals of the solar modules must be connected to DC–, the positive terminals to DC+.
The connection schemes shown in the following can also be mixed.
+
–
OFF
ON
–
+
+
–
OFF
ON
–
+
Fig. 6.17: Connecting one string to a DC connection
+
–
+
–
OFF
ON
+
–
2
+
–
OFF
ON
2
+
–
+
–
Fig. 6.18: Connecting two strings to a DC connection
+
–
+
–
+
–
OFF
ON
+
–
1
2
+
–
+
–
+
–
+
–
OFF
ON
1
2
Fig. 6.19: Connecting three strings to a DC connection
1
Always take account of the
maximum reverse current
loading capability
of the solar modules when selecting
protective devices (for example fuses).
2
Always take account of the local safety regulations when
selecting protective devices.
