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NOTE!
When photovoltaic modules are exposed to light they supply current to the
inverter.
General com-
To enable suitable solar modules to be chosen and to use the inverter as efficiently as
ments regarding
possible, it is important to bear the following points in mind:
solar modules
-
-
-
Note! Before connecting up the solar modules, check that the voltage for the solar mod-
ules specified by the manufacturer corresponds to the actual measured voltage.
DC terminals
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-
The DC-side terminals are suitable for connecting single-wire, round aluminium cables.
minium cables
Because of the formation of a non-conductive oxide layer due to the reaction of alu-
minium with air, the following points must be considered when connecting aluminium
cables:
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Note! Always follow the cable manufacturer instructions when using aluminium cables.
20
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 the maximum
permissible system voltage. 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
calculation programs, like the Fronius Solar.configurator (which can be downloaded
from http://www.fronius.com).
the reduced rated currents for aluminium cables
the connection conditions listed below
Max. cross-section of each DC cable:
10 mm²
Min. cross-section of each DC cable:
2.5 mm²
The DC cables can be connected to the
DC terminals without ferrules.
To ensure effective strain relief of the solar
module strings, only use cables with
identical cross-sections.
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