Help with controller selection.
I am looking for some help finding a controller to do what I need it to in what I call a unique situation. I have a solar operated water pump that is in a well that I use to fill a trough for livestock. The pump runs great during the day on sunny days and slowly on cloudy days on these days it does not keep up. So during the next day I run out of water and have a hard time catching back up. I have installed 2 - 12 volt batteries wired in series that I can hook up and run the pump thru the night to help keep up with water. I have been charging the batteries using a gas powered generator 12 volt system. So I am looking for a controller that will feed my pump control during the day but yet charge the batteries too but at night or at times of low voltage draw from the batteries to feed the pump control. The output from panel is 36 volt the pump control reduces that down to 30 volts max to protect the pump. Maybe there is no such thing but any ideas would be apreciated. Thank you.