BC Pneumatics wrote:Starman covered the wiring well.
Solenoids for Orbit Watermasters are 24vdc and require 0.4A to open, and 0.2A to hold. (9.6w and 4.8w respectively.)
Hmmm, so using 9V batteries to operate two valves simultaneously is marginal. A typical fresh 9V battery probably can't quite get to 1A (9W), a partially used, but still pretty good, battery will be a fair bit less current (and power).