What type of single phase motor?
Split phase, capacitor start, capacitor run, synchronous, etc.
I suspect the single phase induction motor will not make a adequate generator.
Not knowing much about your installation or intended use, I still recommend using the ouput of the water to charge up a battery to drive a load like like a water cylinder or an outbuilding lamp or something like that.
What draws 40 W 24/7 or 80 W for 12/7 ? Landscape lighting? A grow light in the basement? Ornamental water fountain?
