Hi bperrybap, I'll try to explain better.
But, before explaining the system i would like to ask something. It's possible to connect the RTC and LCD in SDA and SCL pins at same time? Or this can affect both gadgets? For example, lossing some data.
About the system, there's one relay that change the power supply every 24h. This relay commut a contactor which has the power.
This 220 VAC power supply supplies the power to the pump, the electro valves, the lights and the 24VDC power supply.
The arduino is powered with an independentment transformer.
5V used to power the RTC, LCD and relays boards is supplied by the arduino board.
I think this is all.
Thanks you!