If the inverter is being operated with an external string collection box, the DC
connector kit 25 (item numbers 42,0201,4479 for DC+ and 42,0201,4480 for
DC-) must be used. In this case the solar modules are externally protected in the
string collection box and the metal bolts should be used in the inverter.
National regulations regarding fuse protection must be observed. The electrical
engineer carrying out the installation is responsible for the correct choice of
string fuses.
CAUTION!
Danger due to defective fuses.
This can result in fires.
▶
Always replace defective fuses with new equivalent fuses.
The inverter is delivered with metal bolts as standard.
Criteria for the
Proper Selection
of String Fuses
In order to prevent premature tripping of the fuse during normal operation, it is
recommended that the following criteria be met per individual solar module
string when fusing-protecting the solar module strings:
-
I
N
> 1.5 x I
SC
-
V
N
>/= maximum open circuit voltage of pv generator
-
Fuse dimensions: Diameter 10 x 38 mm
I
N
Nominal current of the fuse
I
SC
Short circuit current for standard test conditions (STC) according to solar
module data sheet
V
N
Nominal voltage of the fuse
NOTE!
The nominal current value of the fuse must not exceed the maximum fuse pro-
tection value specified in the solar module manufacturer's data sheet.
If a maximum fuse protection value is not specified, please request it from the
solar module manufacturer.
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