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000439AG
5 - Installation
Grid output connection (AC side)
For the connection of the inverter to the grid, you can choose between a
star connection (3 phases + neutral) and a delta connection (3 phases).
In case of an isolation transformer is installed in the energy plant, it’s mandatory to use the star
conguration for the LV winding of isolation transformer (inverter side) with the center of star (neu-
tral) referred to the ground.
In any case, connection of the inverter to ground is mandatory.
Any failure of the inverter when it is not connected to earth through the appropriate terminal is not
covered by the warranty.
Plug the grid cable into the inverter using the specic AC cable gland
11
and connect the AC output screw terminal block
15
.
Use a properly sized 5-pole cable (star conguration) or 4-pole cable
(delta conguration) cable and check the tightness of the AC cable gland
11
at the end of the installation.
Characteristics and sizing of the line cable
The cross-section of the AC line conductor must be sized in order to
prevent unwanted disconnections of the inverter from the grid due to
high impedance of the line that connects the inverter to the power supply
point; In fact, if the impedance is too high, it causes an increase in the
AC voltage that, on reaching the limit set by the country of installation,
causes the inverter to switch off.
The table shows the maximum length of the line conductor based on the
cross-section of this conductor:
Cross-section of the
line conductor (mm
2
)
Maximum length of the line conductor (m)
PVI-6.0-TL-OUTD PVI-8.0-TL-OUTD PVI-10.0-TL-OUTD PVI-12.5-TL-OUTD
4 mm² 55 m 43 m 34 m 28 m*
6 mm² 80 m 65 m 51 m 42 m
10 mm² 135 m 108 m 85 m 70 m
16 mm² 210 m 173 m 136 m 113 m
*Up to 45 °C Ambient temperature
The values are calculated in nominal power conditions, considering:
- loss of power along the line no greater than 1%.
- use of copper cable, with HEPR rubber insulation and positioned in open air.
max 16 mm
19 ÷ 28 mm
2
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