6 Planning the installation
Installation and Operating Manual for RPI M15A M20A Solar Inverter V1.0 2016-03-18
32
6.7 AC connection (grid)
► Always comply with the specific regulations that apply in your
country or region.
► Always comply with the specific regulations of your energy
provider.
► Install all the prescribed safety and protective devices (for
example, automatic circuit breakers and/or overvoltage pro-
tection devices).
► Protect the inverter with a suitable upstream contact breaker:
Model
Upstream contact breaker
RPI M15A
30 A
RPI M20A
40 A
G N L1
L3
L2
N
L1
L2
L3
PE
to the
inverter
Fig. 6.10:
Position of the upstream contact breaker
Residual current device
Because of its design, the inverter cannot feed any DC residual
current into the grid. The inverter thus meets the requirements of
DIN VDE 0100-712.
Possible fault events have been investigated by Delta in compli-
ance with the currently applicable installation standards. The
investigations have shown that no dangers arise if the inverter is
operated in combination with an upstream residual current device
(RCD), Type A. The use of a residual current device, Type B, is
not necessary.
Minimum tripping current of a residual current
device, Type A
≥100 mA
The tripping current required by the residual cur-
rent device depends primarily on the quality of
the solar modules, the size of the PV installation
and the ambient conditions (e.g. humidity). How-
ever the tripping current must not be lower than
the specified minimum tripping current.
Integrated residual current monitoring unit
The integrated residual current monitoring unit (RCMU) is certi-
fied in accordance with VDE 0126 1-1/A1:2012-02 §6.6.2.
Permissible grounding systems
Grounding system
TN-S TN-C TN-C-S TT
IT
Permissible
Yes
Yes
Yes
Yes
No
Requirements for the grid voltage
3P3W
Voltage range
3P4W
Voltage range
L1-L2
400 V
AC
± 20%
L1-N
230 V
AC
± 20%
L1-L3
400 V
AC
± 20%
L2-N
230 V
AC
± 20%
L2-L3
400 V
AC
± 20%
L3-N
230 V
AC
± 20%
