27
Connecting Solar Module Strings to the Fronius
IG Plus (DC)
In order to select suitable solar modules and get the most efficient use out
of the Fronius IG Plus, please note the following points:
- If insolation is constant and the temperature is falling, the open-circuit
voltage of the solar modules will increase. Open-circuit voltage may
not exceed 600 V.
Open-circuit voltage over 600 V will damage the Fronius IG Plus
voiding the warranty.
- More exact values for dimensioning solar modules for the chosen
installation location can be provided using suitable calculation pro-
grams like the Fronius Solar.configurator (available at
www.fronius.com).
NOTE Before connecting solar modules:
- make sure that the voltage specified by the manufacturer
corresponds to the actual measured voltage
- determine whether or not a solar module ground is required
General Infor-
mation About
Solar Modules
Safety
WARNING! An electrical shock can be fatal. Danger from
mains voltage and DC voltage from solar modules.
- The connection area should only be opened by a licensed
electrician.
- The separate power module area should only be discon-
nected from the connection area after first being discon-
nected from the mains power.
- The separate power module area should only be opened by
Fronius-trained service personnel.
Before making any connections, make sure that the AC and DC
sides are disconnected from the inverter.
The DC main switch is only used to switch off power to the
power module. When the DC main switch is turned off, the
connection area is still energized.
CAUTION! Danger of damaging the inverter from improperly
connected terminals. Improperly connected terminals can cause
thermal damage to the inverter and may cause a fire. When
connecting the AC and DC cables, make sure that all terminals
are tightened securely using the proper torque.
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