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34 Planning the installation
• The installation room or cabinet must have adequate ventilation and/or cooling for
all equipment inside. See
• There must be enough space for the inverter for proper airflow. See section
Required clearances for cooling
which the inverter will be mounted must be made of non-flammable material.
• The supporting structure and fastenings must be strong enough to support the
weight of the inverter unit(s). See section
Selecting the power cables
General rules
Dimension the DC input power and AC output power cables according to the local
regulations and the following rules:
• Select cables rated for at least 70 °C maximum permissible temperature of
conductor in continuous use.
• Select a DC cable rated for at least 1000 V DC and which is approved for solar
applications.
• Use only double insulated cables at both DC and AC side.
• Select an AC cable rated for at least 500 V AC.
• The AC cable must have L, N and PE conductors.
• Dimension the AC cables to carry the inverter load current with maximum voltage
drop of 1 percent between inverter and AC distribution board. See also the table
below.
• The minimum PE conductor cross-sectional area is 10 mm
conductor. If a cable with smaller PE conductor will be used, connect an additional
PE conductor of min. cross-sectional area 6 mm
PE terminal of the inverter.
• When shielded cables are used, connect the cable shields to protective earth
(PE) in order to meet safety regulations.
The table below shows the maximum cable length depending on the size of the
phase conductor and the nominal output power.
Conductor
Maximum recommended AC cabling length per nominal output power of
(Cu) cross
section
3300 W
2
mm
AWG
m
2.5
13
10
4
11
17
6
9
25
10
7
42
Mechanical data
on page 107. The wall or supporting structure on
4000 W
ft
m
ft
33
9
30
56
14
46
82
21
69
138
35
115
*NA = Not allowed
on page 103.
Mechanical data
on page 103.
2
2
with a cable lug to the second
PSV300
4600 W
6000 W
m
ft
m
NA*
NA*
NA*
12
39
NA*
18
59
15
30
98
25
for a copper (Cu)
8000 W
ft
m
ft
NA*
NA*
NA*
NA*
NA*
NA*
49
NA*
NA*
82
15
49
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