Solare Datensysteme Solar-Log - Manual (Page 103)

103
Configuring Plant Data
ways scales the graphics up as much as possible in the yield data section. The auto scaling can be disabled
again for the respective graphics.
If the advanced configuration and this menu are deactivated, the graphics are always automatically scaled.
19�4 Defining the PV plant's forecast data
By setting forecast values for the yield data, you can check on the graph whether the plant is reaching the
desired annual yield or not.
To do this, a percentage rate is allocated to each month. This is deduced from the yield statistics over the
previous years.
Solar-Log™ always calculates the target value cumulatively, per day. This means that, at the beginning of
the month, it is not the total monthly target that is set, but the target for days already passed, plus that of
the current day.
In the forecast, Solar-Log™ also takes account of the yields in all previous years, and in this way can allow
for local weather events (in most cases, snow in December). The yearly forecast is therefore usually fairly
accurate by September.
Yearly target section
Enter the yearly target value from the installer's plant project planning. The unit of this value is kWh/kWp.
Fundamentally, this value depends on the overall irradiation at the plant's location and local factors such as
the plant's alignment and shadowing.
In Central Europe, this value is roughly in the range from 800 to 1000 kW/kWp.
If plant groups are used, it is possible to define a separate yearly target for each for each plant group.
Monthly shares & course of sun section
In this section, the settings for the following can be configured for each month:
•
Percentage of the yearly target
•
Sunrise and
•
Sunset
.
Please note that the sum of all of the monthly percentages of the yearly has to always add up to 100%.
This menu is activated by enabling the "Display advanced configuration" setting.