Google - stray current aluminum boat. Lots of folks keep their aluminum boats in the water in marinas and have no problem. I would not. If you do I would recommend researching how to protect it from stray current coming from somebody else's boat, bait light, improper wiring in the marina or other.

I have a good friend that keeps his fiberglass crown line at Grider Hill on lake Cumberland. A couple years ago stay current in the marina ate up his metal below water line through hull fitting and his boat sank. He had to get a new motor for ten grand.

If you do protect it with the proper anodes and make sure they are installed properly.

Lots of people do it. I'm a little paranoid. I have had stray current demolish my boat on the trailer in my garage. Obviously that current was coming from my own boat and the hull had water in it all that winter. I forgot it got rained on and didn't pull the plug when I put it up for the winter.

Water and electricity equals holes in aluminum. As a side note, aluminum, copper and water creates electricity and equals holes in aluminum. Any salt in the equation makes it a lot worse.

I looked at fiberglass boats the last time I bought a boat so I wouldn't have to worry about it but couldn't make the switch. I'm just an aluminum boat junkie I guess.