I have a micro controller based irrigation controller which should control solenoid valves.
The solenoid is 24V AC type, with 25 Ohm resistance. I am considering to use some triac based SSR to switch the 24V AC circuit. The input (emitter) is fine, just needs a limiting resistor to keep the current around 30mA.
I want to have the circuit as simple as possible, but reliable as well. I think if I use a zero switching triac based SSR then there will be no need to worry about any voltage spike from the inductive solenoid, right? The output can be just the 24V AC source connected to the solenoid through the SSR output. And of course the SSR should be capable switching current around 1A.
Thank you for your advice.