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Connecting to the grid (AC)
General notes
NOTICE
Ingress of moisture
If the wiring box cover is removed, the degree
of protection is no longer IP65.
► Do not remove the cover unless the inverter
is in a dry environment.
Important safety instructions
► Always follow the specific regulations of your country or
region.
► Always follow the specific regulations of your energy provi-
der.
► Install all the stipulated safety and protective devices (such
as automatic circuit breakers and/or surge protection de-
vices).
► Protect the inverter with a suitable upstream circuit breaker:
Upstream line protection
PE
L1
L2
L3
► Selection of the protective devices for the grid cables to
the transformer of the mains feed-in point: Always take into
account the impedance between the PE of the inverter and
the system and/or operational ground of the distribution
network. This applies in particular to TT and IT networks.
Residual current circuit breaker
Due to its design, the inverter cannot supply the mains with DC
residual current. This means that the inverter meets the require-
ments of DIN VDE 0100-712.
Possible error events were assessed by Delta in accordance
with the current installation standards. The assessments
showed that no hazards arise from operating the inverter in
combination with an upstream, type A residual current circuit
breaker (FI circuit breaker, RCD). There is no need to use a
type B residual current circuit breaker.
Minimum tripping current of the type A residual
current circuit breaker
The required tripping current of the residual cur-
rent circuit breaker depends first and foremost
on the quality of the solar modules, the size
of the PV system, and the ambient conditions
(e.g. humidity). The tripping current must not,
however, be less than the specified minimum
tripping current.
Integrated residual current monitoring unit
The integrated, universal current-sensitive residual current
monitoring unit (RCMU) is certified in accordance with VDE
0126 1-1:2013-08, Section 6.6.2.
30
Integrated string fuses and surge protection devices
► Replace damaged string fuses with devices of the same
► Surge protection devices are available from Delta.
Grounding the inverter
The inverter must be grounded via the PE conductor. To do this,
connect the PE conductor of the AC cable to the AC plug pin
provided for the purpose.
Permissible grounding systems
125 A
L3
L2
to the
L1
inverter
Grounding system
PE
Allowed
Requirements for the grid voltage
3P3W
L1-L2
L1-L3
L2-L3
L1-L2
L1-L3
L2-L3
Tools
Use an insulated torque wrench with an Allen key bit for the
contact screws.
≥300 mA
Quick installation guide for solar inverter M88H RPI883M121300 RPI883M122300 EU V1 EN 5017414200_00 2019-11-07
type and from the same manufacturer.
DANGER
Electric shock
In IT grids, a twofold insulation fault can lead to
high residual currents on the inverter housing.
► Ground the housing of the inverter via the
grounding connection.
► Set up a permanent insulation monitoring
system.
► The first time an insulation fault occurs,
this insulation fault must be rectified
immediately!
TN-S
Yes
Voltage Range
400 V
± 30%
AC
400 V
± 30%
AC
400 V
± 30%
AC
480 V
± 20%
AC
480 V
± 20%
AC
480 V
± 20%
AC
TN-C
TN-C-S TT
IT
Yes
Yes
Yes
Yes
3P4W
Voltage Range
L1-N
230 V
± 30%
AC
L2-N
230 V
± 30%
AC
L3-N
230 V
± 30%
AC
L1-N
277 V
± 20%
AC
L2-N
277 V
± 20%
AC
L3-N
277 V
± 20%
AC
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