General Information About Solar Modules; String Fuses - Fronius Primo 3.8-1 208-240 Installation Instructions Manual

NOTE!
To ground solar module frames or mounts, you must observe both the relevant
instructions from the solar module manufacturer and national guidelines.
General Inform- In order to select suitable solar modules and get the most efficient use out of
ation about Solar
the inverter, please note the following points:
Modules
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NOTE!
Before connecting solar modules, make sure that the voltage specified by the
manufacturer corresponds to the actual measured voltage.
Note the safety instructions and specifications of the solar module manufacturer
regarding solar module grounding.

String Fuses

Only valid for the device types with the "Ecofuse" option:
The use of string fuses provides additional fuse protection for solar modules.
The maximum short circuit current I
I , and the specification of the maximum string fuse value in the module data
R
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.
However, a release current of 20 A must not be exceeded.
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.
Danger due to faulty fuses.
This can result in fire.
▶
The inverter is delivered with metal bolts as standard.
The open circuit voltage of the solar modules increases as the temperature
decreases (assuming constant irradiance).
Note the temperature coefficients in the solar module data sheet.
More exact data for sizing the solar modules can be obtained using calcula-
tion tools such as the Fronius Configuration Tool (available at http://
www.solarweb.com).
See NEC table 690.7 for the appropriate code-related voltage adjustment
factor for crystalline silicon modules, or use the manufacturer's specified
voltage coefficient.
CAUTION!
Only replace faulty fuses with new ones of the same rating.
, the maximum module backfeed current
SC
per terminal is 15 A.
SC
35