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Criteria for the Proper Selection of String Fuses
General
The use of string fuses in the Fronius DC Box 60/12 also adds fuse protection to the solar
modules.
A crucial factor for the fuse protection of solar modules is the maximum short circuit current
I
SC
Criteria for the
The following criteria must be fulfilled for each solar module string when using fuse protec-
Proper Selection
tion:
of String Fuses
-
-
-
-
-
I
N
I
SC
V
N
Effects of Using
With underrated fuses, the nominal current value may be less than the short circuit current
Underrated Fuses
of the solar module.
Effect:
The fuse may trip in intensive lighting conditions.
Fuse recommen-
dations
For total safety, always use the following fuses, which have been tested by Fronius:
-
Fronius shall not be liable, and all warranty claims shall be invalidated, for damage or other
incidents that are associated with the use of different fuses.
Fuse Recommen-
Example: Maximum short circuit current (I
dations - Applica-
tion Example
According to the criteria for selecting the right string fuses, the fuse must have a nominal
current greater than 1.5 times and less than 2.0-times the short circuit current:
-
-
Fuse to be selected from the 'Fuses' table:
SPF9 with a nominal current of 9 A
or
SPF10 with a nominal current of 10 A.
of the respective solar module.
I
> 1.5 x I
N
SC
I
< 2.0 x I
N
SC
V
>/= max. input voltage of inverter being used:
N
Fronius IG 15 - 60 ... 530 V DC
Fronius IG Plus / IG Plus V ... 600 V DC
Fronius IG-TL ... 850 V DC
Fuse dimensions: Diameter 10.3 x 35 - 38 mm
Nominal current rating of fuse
Short circuit current for standard test conditions (STC) according to solar module
data sheet
Nominal voltage rating of fuse
NOTE! Always select fuses whose rated voltage is greater than or equal to the
maximum input voltage of the inverter used.
Littelfuse SPF fuses
5.75 A x 1.5 = 8.625 A
5.75 A x 2.0 = 11.5 A
) of the solar module = 5.75 A
SC
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