I am a user of Rachio in Europe. Everything works fine here, but I have some special case to be resolved. Could you please check if there are no pitfalls in it and scheme looks like working?
I have a well in my yard with rather small throughput, 800 liters/hour (around 200 gallons/hour), shared for house needs and for watering. In order to water reliably and do not have issues with water in house during watering yard, I have 5m3 (around 1300 gallons) water tank that I'm filling, temporary manually, and then I'm using other pump for watering yard from this tank.
Since electricity costs at night (11pm-7am) half a price comparing to day time, and also using water in house at night is limited so it's better to take water that time, I would like to fill a tank by schedule at night.
I have unused 24vac valve so I installed it to the tank's incoming pipe.
Now, I'm going to connect it to one of zones of my Rachio and set fixed schedule like 11pm-7am.
I want to pass zone wire through relay controller, that uses level sensors that were put to tank, and connects inputs when level is low/disconnects when level is high. It means, Rachio will think it waters zone for 8 hours long, but relay controller will really disconnect power from valve in few hours, depending on how much water system will need to make tank full.
Does such configuration promising to be working and if there any drawbacks?
I understand calculations of water usage will be doubled, but this is not something I care about. What else can be an issue?