Fronius IG 300 - Manual (Page 16)

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The FRONIUS IG is designed for use with solar modules with a wide range of voltage
input. This enables the widest possible variety of types of solar module to be used.
However, it is of the utmost importance to ensure that the stated values for maximum
DC voltage (the total voltage of the solar cells connected) are never exceeded.
The FRONIUS IG is constructed and operated in the safest possible way, in terms of
assembly and installation as well as operation.
Voltage transfor-
mation and
galvanic isolation
Your FRONIUS IG is a state-of-the-art photovoltaic inverter. It acts as a highly sophisti-
cated link between the solar modules and the public mains network.
As such, it is responsible for a number of important functions.
General
The FRONIUS IG in the photovoltaic system
The FRONIUS IG converts the direct current (DC) generated by the solar modules into
alternating current (AC). This alternating current is fed synchronously into the mains
supply in your in-house network and the public mains network. The FRONIUS IG has
been developed specifically for use in photovoltaic systems that are linked to the mains.
Power cannot be generated independently from the public mains network. Converting DC to
AC current
The FRONIUS IG operates fully automatically. As soon after sunrise as the solar modu-
les are producing sufficient power, the control module starts monitoring the mains
voltage and frequency. When insolation has reached a sufficient level your photovoltaic
inverter will start to feed current. Depending on the model, just a few watts of solar
energy can be sufficient for this purpose!
The FRONIUS IG consistently works in a way that ensures the maximum power possible
is obtained from the solar modules.
This function is known as MPPT (maximum power point tracking), and is implemented
with maximum precision. As soon after dusk as the power available has fallen below the
level at which current can be fed into the mains, the FRONIUS IG disconnects itself
completely from the mains and stops running. Needless to say, it retains all its settings
and stored data.
Fully automatic
operational
management