Hello everyone i am new and need help,i am working on a project right now building a hydro electric generator, i have water running through my property but id like to conserve water as much as possible and the only way for me to do that is with a inline electric valve that runs off of 12v, the only problem im having is that i cant find a switch or whatever i need to have the valve open when my batteries get low amd close when they are full. If anyone has a schematic and parts list or where i can find a switch like this please let me know.