I expect the battery eventually runs down. We use a pretty cheap tarp so some light gets through. It's always running by the time we get the boat uncovered so we never have been able to check. Mary Lou At 07:16 AM 7/25/2002 -0400, you wrote: >Mary Lou, I imagine you cover the boat in the winter? Does the fan still >run without direct sunlight? > >Joe >S/V Whisper