Selection of Fuses and Cables
Main cable (AC line cable) shall be short circuit protected and thermal over-
load protected.
Always fit the input cable with fuse. Normal gG (US:CC or T) fuses will protect
the input cable in short circuit situation. They will also prevent damage to
adjoining equipment.
Dimension the fuses according to local safety regulations, appropriate input
voltage and the related current of the solar inverter.
AC output protected by external fuse (gG rated current 25A/250VAC for
3.0kW/3.6kW
；
40A/250VAC for 4.6kW/5.0KW/6.0KW) provides in all live connec-
tions to the AC supply.
The rated short circuit breaking capacity of the above protective device shall be
at least equal to the prospective fault current at the point of installation.
See section technical data of this manual details.
AC output cable: Cu; L, N+PE: 2*4.0mm
2
+4.0mm
2
for 3.0KW/3.3KW/3.6KW and
2*5mm
2
+5mm for 4.2KW/4.6KW @40
℃
ambient temperature with a max length
of 5m, with operating time of the fuses of less than 5 seconds, installation
method B2 according to EN60204-1:2006, annex D: cable in conduit cable
trunking system, number of loaded circuit only one. Use H07RNF (cord
designa- tion 60245 IEC66) for an ambient temperature of 40℃ or less and
use 90℃
wire for ambient temperature between 40℃ and 60℃.
Note 1: For conditions differing from those mentioned above, dimension the
cables according to local safety regulations, appropriate input voltage and
the load and the load current of the unit (you can choose a thicker cable but
the fuses must rated according to the cable).
Note 2: Fuses must be approved by Notified Body.
Inverter does not provide galvanic isolation from the mains to the PV array,
feedback current to the array is 25A/250VAC for 3.0kW and 3.6kW;
40A/250VAC for 4.6kW, 5.0kW and 6.0kW based on the fuse provided in
the mains. Also, in the worst case the reverse current comprises the sum of
the short-circuit currents of all intact lines.
Therefore the current-carrying capacity of the components and sub-assemblies
provided in the end-use system (connectors, cables, junction box, switch gear,
etc.) and the reverse current PV modules shall be considered based on the
feedback current and reverse current. The direct current (DC) circuit breaker or
fuse between each solar generator and inverter shall be provided based on
solar inverter input ratings.
Select DC cables based in the above inverter back-feed current and ISC PV
rating and Vmax ratings.
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