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Installation and Operating Manual for RPI M15A M20A Solar Inverter V1.0 2016-03-18
6 Planning the installation
6.8.4 Connecting to grounded solar modules
When grounded solar modules are used, the DC inputs must be connected in parallel.
There must be an isolating transformer connected between the connection to the grid and the AC terminal on the inverter.
After commissioning, the insulation monitoring on the inverter display must be set, see “9.12 Insulation mode and insulation resistance”,
page 94.
1 - L1
2 - L2
3 - L3
4 - N
5
- PE
1 - L1
2 - L2
3 - L3
- PE
3P4W
3P3W
+
–
Z
Z
parallel DC inputs
ONLY
Distribution Box
DC wiring
PV array
Positive grounding
Negative grounding
OR
Utility
3-phase, 230/400 V
AC
star or delta connection
Inverter
230/400 V
AC
Isolated
transformer
Isolated
transformer
Fig. 6.16: System design when using grounded solar modules
