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)
TRIO-20.0-TL-OUTD TRIO-27.6-TL-OUTD
10 42m 30m
16 70m 50m
25 100m 78m
35 138m 98m
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
Load protection switch (AC disconnect switch)
To protect the AC connection line of the inverter, we recommend install-
ing a device for protection against over current and leakage with the fol-
lowing characteristics:
TRIO-20.0-TL-OUTD TRIO-27.6-TL-OUTD
Type Automatic circuit breaker with differential thermal magnetic protection
Voltage/Current rating 40A/400V 63A/400V
Magnetic protection characteristic B/C B/C
Type of differential protection A/AC A/AC
Differential sensitivity 300mA 300mA
Number of poles 3/4 3/4
max 35 mm
20 ÷ 32 mm
2
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