What voltage is typically used to operate an electric irrigation valve solenoid?

• A. 24 volts AC
• B. 120 volts AC
• C. 12 volts DC
• D. 240 volts AC

Answer: (A)

24 volts AC is the standard control voltage used to energize irrigation valve solenoids. This level comes from the typical irrigation controller setup, which uses a small transformer to provide a 24V AC supply that the controller switches to the valve wires when a zone is activated. Using this low-voltage AC keeps wiring simple and safe over long runs, and it aligns with the common solenoid design and the standard controllers and relays available on the market.

High voltages like 120 or 240 V would require heavier wiring, more protection, and different hardware, making installation and safety more complex for typical landscape layouts. DC is not the norm here because most valves and controllers are designed around AC coils, and standard accessories (transformers, relays) support AC operation. So the typical operating voltage for an irrigation valve solenoid is 24 volts AC.