Hi Mike,
Sorry was not very clear. We are using it to run frost protection so the water has to be applied and certain way.
The solution we have worked out is just to use an thermostat switch hooked up as an rain sensor so when it is below an temp it will run the programs and once it goes above that temp it will turn off.
So we will have an program that starts at say 9pm an runs on repeat till 9am with the thermostat switch hooked up so it only runs when the temp is low.
Cheers