I will need to connect the pump start relay and I don’t need to power the controller off-grid, so everything is clear now. Thank you for the explanation.
My mains voltage standard is 220V ~ 240V AC. Can I buy such power supplies from you? Can I use the adapter from the link below or similar?
Rail mounted PSU (DIN) Comatec TRAFO 24 VA 24V 24 V AC 1 A 24 W