Can we install SPRING panels on 2 roof sections / orientations on the same project?

There are two cases to consider depending on whether the roof surfaces are split with the same orientation or if the roof surfaces have a different orientation, e.g. East/West:


1. If the 2 sides have the same orientation in the sun:

The solution is to connect the fields of panels in parallel on the same hydraulic loop


Care must be taken to balance the pipe lengths between the two fields.




If the panel fields consist of a different number of panels it is advisable to install a hydraulic balancing valve at the inlet of one of the fields and to set the flow rate at the solar station and at the balancing valve to 1 L/min/panel.  





2. If the 2 orientations are different:




A SPRING temperature sensor (PT1000 FKP4) must be placed on each field of panels to be able to manage the fluid flow in one or the other of these fields. 


One SPRING temperature probe will be connected to terminal block S1 and the other SPRING temperature probe will be connected to terminal block S4 of the DualSun SLL controller. 


In this case n°2, a circulation pump must also be added so that the two panel fields can be used independently of each other.


For this purpose, system 7 of the DualSun SLL solar control must be used.


Relays R1 and R2 must be set in PSOL mode to control the two circulators independently. 


Activation of the circulators:

  • R1 = measured temperature difference between S1 (field no. 1) and S2 (bottom of storage tank).
  • R2 = temperature difference between S4 (field no. 2) and S2 (bottom of the storage tank).


The setting of the activation/deactivation parameters remains unchanged:

  • DTON = 6
  • DTOFF = 2


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