Yeah it's one of those perennially interesting problems that uses up a lotta bar napkins, but when you sober up you just go out and buy a pump ...
Pump takes about 4 amps (mine does anyways), do a few calcs and see just how little power it uses for how much annoyamce it does away with. Total up actually how long the pump actually runs each day, what, maybe 20 or 30 minutes if you put it all together and you get less than 2 amp hours a day ...
Tom