Fronius Primo (Online) - Manual (Page 16)

14
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 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.
NOTE! Before connecting up the solar modules, check that the voltage for the so-
lar modules specified by the manufacturer corresponds to the actual measured
voltage.
The solar module manufacturer's safety instructions and regulations regarding
solar module grounding must be observed.
min. 2,5 mm² - max. 26 mm²
min. 1,5 Nm - max. 1,8 Nm
DC= (+)
DC= (-)
MPPT1
MPPT2
D1
D2
D1
D1
D1
D3
NOTE! To ensure effective strain
relief of the solar module strings,
only use cables with identical
cross-sections.