11
EN
Notes regarding DC connection
General com-
ments regarding
solar modules
To enable suitable solar modules to be chosen and to use the inverter as efficiently as pos-
sible, it is important to bear the following points in mind:
-
If insolation is constant and the temperature is falling, the open circuit voltage of the
solar modules will increase. The open circuit voltage must not exceed 1000 V. If the
open circuit voltage exceeds the specified values, the inverter will be destroyed and
no warranty claims will be entertained.
-
The temperature coefficients on the solar modules data sheet must be observed
-
More exact values for dimensioning the solar modules can be provided by suitable cal-
culation programs, like the Fronius Solar.configurator (which can be downloaded from
www.fronius.com).
DC terminals
Max. cross-section of each DC cable:
16 mm²
Min. cross-section of each DC cable:
2.5 mm²
The DC cables can be connected to the DC
terminals without ferrules.
In the case of a DC cable with a cross-section of 16 mm², ferrules can be either not used
or only used to a limited extent depending on the type of ferrule and crimping.
Connecting alu-
minum cables
The DC-side terminals are designed for connecting single-wire, round aluminum cables.
The following points must be taken into account when connecting aluminum cables due to
the non-conducting oxide layer of aluminum:
-
Reduced rated currents for aluminum cables
-
The connection requirements listed below
Connection Requirements:
NOTE!
Before you connect up the solar modules you should check that the volt-
age specified by the manufacturer corresponds to the actual measured voltage.
DC =
+
+
-
+
-
-
DC+
DC-
D1
D2
D1
D1
D1
D3
NOTE!
To ensure effective strain
relief of the solar module strings,
only use cables with identical
cross-sections.
NOTE!
Take into account local specifications when configuring cable cross sec-
tions.
