Fronius IG 300 - Manual (Page 15)

7
Voltage module 1
The efficiency and the voltage are increa-
sed by connecting solar modules together.
If solar modules are connected in series to
form a string, both the potential power and
the voltage are increased.
Mod.1
Mod.2
Mod.n
String
+
-
Total string voltage
Voltage module 2
Voltage module 3
Current is gene-
rated on the roof
(continued)
Total string voltage = voltage module 1, 2, ... n
The DC current generated in the solar modules cannot be fed into the public mains
network or used within the household unless it has first been converted in the inverter.
This is the primary function of the FRONIUS IG. Current is con-
verted underne-
ath the roof
When a number of these strings are
connected in parallel, both the potential
power and the module current are increa-
sed while the voltage remains the same.
All the solar modules that are connected in
parallel and in series are described collec-
tively as a ‘solar generator’.
Mod.1 Mod.2 Mod.n
String 1 String 2 String 3
+
-
Fig. 1 Solar modules connected in series
Fig. 2 Solar modules connected in parallel