I just launched a 36 wooden boat (strip planked) that was out of the water for over two years. We knew it would leak a lot but it hasn't been as bad as I expected.
There are two bilges, one 1100gph and another one 360gph. I know the 1100 has a 6amp fuse. The pump has been running every ~4 minutes for maybe 5 seconds each time (max of about 30 minutes a day)..
I have gone out to the boat and run the engine for 60 minutes each day since I am worried about the two batteries. Am I crazy? How long would they last, theoretically? They aren't running anything other than the pumps themselves.
(note: I have an aux shore power pump on board as well, but the float on it is much higher and the water would be above the floorboards before it would come on. I'd rather not deal with grimy bilge water cleanup in the cabin if I could).
Also, does anyone have any experience with these, or anything similar that is specifically for boats? http://www.batterystuff.com/solar-chargers/BSP512.html