String fuses
Fronius Eco -
string fuses
WARNING!
Danger from voltage at the fuse holders.
This may result in an electric shock. The fuse holders are live when voltage is
present on the DC connection of the inverter, even when the DC switch is
switched off.
▶
Make sure that the DC side is de-energised before carrying out any work on
the inverter fuse holder.
String fuses are used in the Fronius Eco to provide additional protection for the
solar modules.
The short circuit current I
sc
and the maximum series string fuse data (e.g. max-
imum series fuse rating) specified in the module data sheet of the respective PV
module are crucial in affording the PV modules the correct fuse protection. The
maximum string fuse rating per terminal is 20 A. The maximum MPP current
(nominal current, operating current) I
max
is 15 A per string.
The national regulations regarding fuse protection must be observed. The elec-
trical engineer carrying out the installation is responsible for the correct choice
of string fuses.
Inputs 1.1 - 1.3 and 2.1 - 2.3 are connected in parallel inside the device. This must
be taken into account when providing the fuse protection.
Note! To avoid the risk of a fire, only replace faulty fuses with new ones of the
same type and rating.
As an option, the inverter can be supplied with the following fuses:
-
6 x 15 A string fuses on the DC+ input and 6 x metal pins on the DC- input.
The string fuses installed have a nominal voltage of 1000 V and measure
10x38 mm in size.
-
12 x metal pins
20
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