Is it possible to add and control a booster pump on a DualSun pool heating system?

Edited

Yes, with a DualSun SLL solar controller.

 

Here is a diagram that explains how to wire and control the booster pump:  

200902_-_Sch_mas_c_blage_surpresseur_via_contacteur.png




Setting of the solar controller

To access the menu

  •  Press and hold down the button

    Touche_validation.PNG.png

  • Turn the rotary actuator to the desired menus

  • Enter the menus by pressing the button

    Touche_validation.PNG.png

Parallel relay option

  • OPARR = ON

  • REL = R2

  • RELR = R1

  • INVERS = OFF

Configuration REL relay

  • Relay R2 = ONOF

Example of contactor model: Relay 230V - 2 NO contacts - 9A (AC3) contacts for inductive loads (motors, up to 1300W).