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General remarks
Copyright
The copyright to these operating instructions remains the property of Fronius Internatio-
nal GmbH. Text and illustrations were accurate at the time of printing. Subject to change
without notice. We are grateful for any suggestions for improvement and for drawing our
attention to any errors in these instructions.
The contents of the instruction manual shall not provide the basis for any claims
whatsoever on the part of the purchaser. Fronius International GmbH shall not be liable
for any damage (including loss of profit or any other financial loss) attributable to the use
of, or impossibility of using, this device.
Introduction
The Fronius String Control 125/25 is a system add-on for mains-connected Fronius IG
300, 390, 400 and 500 inverters. The Fronius String Control 125/25 combines 5 solar
module strings in one measuring channel. The Fronius String Control 125/25 compares
the current of each measuring channel with the average value of all channels. Any
excessive deviation will result in a status message. The user is free to define what an
acceptable deviation is.
„Fronius Solar.access" software and the Fronius IG datalogger also support the sending
of status messages by e-mail or SMS for Fronius String Control 125/25. This allows a
faulty solar module to be detected quickly.
In addition, the Fronius String Control 125/25 bundles all solar module strings into one
single positive and negative pole. Slots are provided for fuses. Provided that the correct
fuses have been chosen, each individual string is protected against overcurrent.
The Fronius String Control 125/25 has 5 measuring channels for each of the 5 strings.
Function
This gives up to 25 string connections. The 5 measuring channels record the total
current of each of the strings connected over the whole charging day. In the evening, the
Fronius String Control 125/25 uses these figures to calculate an average value for all
measuring channels. If the Fronius String Control 125/25 detects that one of the measu-
ring channels deviates too much from the average, a status message is sent to the
Fronius IG Datalogger.
System require-
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ments
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Fronius IG 300, 390, 400 or 500
Fronius IG Datalogger
PC with installed Fronius Solar.access software
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