Installation guide

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3.7 Site level settings
At the top of the system tree the settings screen shows details of the PV-Plant being configured. It allows
you to set values for plant wide settings; watch database events in the logger window. Command line but-
tons allow you to clear the logger and disconnect from the database.
On-Line Update
This interval sets how often the On-Line database values are updated. The On-Line database contains the
current value of all plant variables. It is used for displaying current measurements in the PV-Clinics Monitor
module so this variable determines how often the values update. For large or complex plants this value
should be set to the largest value (60s). The default value is 10s.
Historic Update
This interval sets how often the On-Line values are transferred to the Historic Database. Larger values lead
to a larger database size. It should be greater than or equal to the On-Line interval.
Historic Size
Check the historic size box and enter a time period to limit the length of time that historic records are kept. If
you will be backing up the database off site you can set this to a smaller value. Setting a smaller value will
reduce the time taken to query the database.
RMS values in Weidmuller modules
Check this box so that each reading from any Transclinic is given as an average value.
Enable string box historic when...
To reduce the size of the database, set a value for this voltage and check the box. This option prevents the
database from recording values when the PV Plant is not producing and significantly reduces the database
size. You would normally check this box and set a suitable value for the voltage.
Estimating the historical database size
As a rule of thumb, at 5s interval, the system will use less than 10M of disk space per device per month. So if
you have four Transclinics and one inverter, one weather station and you want to keep records for 25 years,
you will need around 10M x 6 x 12 x 25 = 18G.