Trying not to dig up my entire yard:
My 24VAC rainbird sprinkler system keeps blowing my controllers 1 amp fuse. I know that this is caused by one zone solenoid valve (buried seperately somewhere in my yard) that has gone bad. I know from experience that if I turn off the water supply, that I would be able to hear/locate a good valve being cycled as my helper intermittently breaks valve power at the controller. I also know that I can sometimes force a stuck valve open by using a stronger power supply, which I have in the form of a DC supply. So, my plan is to force this valve back to a working condition, long enough to hear/locate and replace it.
My simple question: If my 24 VAC solenoid draws .7 amps, what will it draw if I use my stronger 12 volt DC supply. I'll use that value to help determine how much low duty cycle DC power to use to "kick start". Is this a matter of calculating the resistive component of the impedance?