User Manual

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Enter the number of solar module strings for each measuring channel.
This results in automatic compensation of measuring channel deviations,
which would only be required if there were a different number of strings
per channel.
Strings per
Measuring
Channel
The 5 measuring channels record the total current of the respective con-
nected solar module strings over the entire charging day. In the evening,
the Fronius String Control 250/25 averages all measuring channels and
compares the current of each measuring channel with the average value
of all channels.
If the Fronius String Control 250/25 detects that one of the measuring
channels deviates too much from the average, a status message is sent
to the Fronius Datalogger.
The percentage deviation above which a measuring channel is conside-
red faulty is defined in the “Max. Energy Deviation“ input field.
Standard value for max. energy deviation: 5 - 10 %
If applicable, observe information from the solar module manufacturer.
Max. Energy
Deviation
Minimum electric charge (Ah) at which evaluation is to start. This prevents
possible status messages in bad weather.
Threshold