27
Installation and Operation Manual for RPI M50A
5 Planning the installation
For currents and voltages see
“13. Technical data”, p. 105
.
5.8.2 Use with solar modules that do not
need to be grounded.
When you use PV modules that do not need to be
grounded, you can connect the DC inputs separately
or in parallel.
“Separate DC inputs” means each DC input is con-
nected to a separate MPP tracker. “Parallel DC
inputs” means both DC inputs are connected to one
MPP tracker. With parallel DC inputs you cannot real-
ize asymmetrical power inputs.
PV arrays can be connected to the inverter directly or externally parallel connection at DC distribution box.
OFF
ON
DISCONN.
AC/DC
AC OUTPUT
DC INPUT
DC 1
DC 2
COMM.
+
–
+
–
+
–
+
–
1 - L1
2 - L2
3 - L3
4 - N
5
- PE
1 - L1
2 - L2
3 - L3
- PE
Separate or
parallel DC inputs
AC wiring
DC wiring
3P3W
3P4W
PV array
Fig. 5.15: System design with fl oating DC inputs