Fronius IG 300 - Manual (Page 19)

11
The FRONIUS IG
The FRONIUS IG is designed for fully automatic operation. Basically, no manual operati-
on is needed in order to feed power into the mains.
The FRONIUS IG starts automatically as soon after sunrise as the solar modules are
delivering sufficient power. From this time onwards, system data will be displayed on the
FRONIUS IG graphic display.
Whilst the FRONIUS IG is running it keeps the voltage of the solar modules constantly
within the range for obtaining maximum power.
-
The optimum voltage for the operational status of the solar modules at any given
time is known as the MPP voltage (MPP = maximum power point).
- Sticking strictly to the MPP voltage at all times ensures that the solar modules
always operate as efficiently as possible (MPP tracking).
As soon after dusk as the power available to feed into the mains falls below a sufficient
level, FRONIUS IG disconnects completely from the mains.
-
FRONIUS IG does not take any power out of the public mains network overnight.
- Stored data and settings are retained.
- The system can also be switched off manually.
Mode of operati-
on
The MIX concept ensures that the power modules are comprehensively managed.
Instead of one large power module, there are several small power modules to convert
the current. When the insolation level is low, not all the power modules in the inverter will
be switched on. As a result, the power modules operate in a higher partial-load range
than would be the case with a single large power module. This enables the energy to be
converted much more efficiently. The other power modules switch on only as the output
increases.
The name „Master Inverter X-Change (MIX)“ more or less explains how the device
works: One power module (the master) is responsible for coordination, and controls the
deployment of the other power modules. The control software assigns the master role to
the different power modules in turn. This work-sharing method reduces the number of
operating hours for individual power modules and improves results in partial-load situati-
ons.
Another advantage of the MIX system is that it is relatively failsafe. If one power module
fails, the others simply take on the work it was doing. This means that power losses will
only occur when the insolation level is high, and even then they will be limited.
In summary, the MIX system offers the following benefits:
-
Optimum efficiency by switching off unnecessary power modules
- Power modules are used equally thanks to the intelligent management system
- The system is failsafe as it consists of a large number of independent power modu-
les
MIX system