Planning the installation 37
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% between inverter and AC distribution board. See the following table.
• The minimum PE conductor cross-sectional area is 10 mm
2
for a copper (Cu)
conductor. If a cable with smaller PE conductor will be used, connect an additional
PE conductor of minimum cross-sectional area 6 mm
2
with a cable lug to the
second 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
(Cu) cross
section
Maximum recommended AC cabling length per nominal output power of
PVS300
3300 W 4000 W 4600 W 6000 W 8000 W
mm
2
AWG m ft m ft m ft m ft m ft
2.5 13 10 33 9 30 NA* NA* NA* NA* NA* NA*
4 11175614461239NA*NA*NA*NA*
6 9 25 82 21 69 18 59 15 49 NA* NA*
10 7 42 138 35 115 30 98 25 82 15 49
16 5 67 220 56 184 49 161 35 115 30 98
*NA = Not allowed
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