10 Measuring energy output
The controller can calculate and display the energy output of the solar power system. To
do so, it requires the following values:
• Flow rate
• Temperature difference between the collector and collector return flow temperatures
• Glycol type and glycol concentration in the heat transfer fluid
The energy output (kWh) is displayed in the "Info" menu in the following menu item:
kWh
You can set the following measurement principles:
• Flow sensor (DFG)
• VFS (Vortex Flow Sensor)
• Flow indicator.
10.1 Flow indicator
In the case of this measurement principle the flow rate is measured just the once by a flow
indicator (or adjustment valve) at a pump output of 100 %. The measurement value is
entered at the controller. The flow indicator can then be removed again. The energy output
is determined on the basis of this measurement value.
l/min
12
10
8
6
4
2
l
P:
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