String Fuses - Fronius Symo Advanced Series Installation Instructions Manual

String Fuses

Only applies to device types with the "Ecofuse" option:
The use of string fuses provides additional fuse protection for solar modules.
The maximum short circuit current I
specification of the maximum string fuse value in the module data sheet of the respective
solar module are decisive factors in the protection of the solar module.
The maximum short circuit current I
The string fuse release current can be set to greater than 15 A if required.
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 electrician perform-
ing the installation is responsible for choosing the right string fuses.
The inverter is delivered with metal bolts as standard.
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NOTE! Solar modules exposed to light supply current to the inverter.
NOTE! When using the cable inlets at the back, take care to seal them according
to protection class NEMA4X before operating outdoors.
NOTE! When connecting aluminum cables:
- follow all national and international guidelines regarding the connection of
aluminum cables
- follow the instructions of the cable manufacturer
- perform an annual check to ensure that the cables are firmly attached ac-
cording to the proper torque.
NOTE! When connecting DC cables, ensure the polarity is correct.
NOTE! Form a min. 4 in. (100 mm) cable loop with all cables.
NOTE! To prevent a risk of fire, faulty fuses must only be replaced by new equiv-
alent fuses.
, the maximum module backfeed current I
SC
per terminal is 15 A.
SC
, and the
R