I think this technology exists but I don't know what the device is that I need to do the job.
I need a DC Power supply that will pull input 110V - 220V AC (for here or international) and will output 48V DC @ 20A. But here's the catch. It's to provide backup power to a solar irrigation pump that currently runs on 48V DC.
Using a timer I'll allow the AC power source to get power from 6 am to 10 pm. I only want to provide the AC power when the solar DC power is absent (like a very cloudy day or after sunset.) But when solar is present and working fine, I don't want the AC to be drawing hardly anything.
So my question is, while I could design a circuit to measure the solar voltage / power input, and then kick on the power supply and disconnect the Solar, I am wondering if that is re-inventing the wheel.
Is there a device that does this already that I should simply buy instead? Like some kind of AC -> DC power supply that can detect the voltage / amperage / power from the solar and can top it off or smooth it out for me?
Remember I don't want to be using AC power hardly at all when solar is available.