Choporoz

I've got one (6W, I think) and badly wanted it to work for same reason as OP. I tested once in the backyard on a (mostly?) drained battery for one week with no noticeable increase in charge. Not very scientific, but I was disappointed and haven't taken it out since.

I'm Dave - from Woodbridge, VA. Largemouth fisherman, frequenting those rez up here that rent boats: Occoquan, Hunting Run, Brittle, Lunga, especially -- and a couple of times out of Pohick Park (but their hours are pretty limiting.) I'm currently in the market for a boat (and a place to park it since I live in a town house and front lawn isn't an option, according to my HOA.) I try to get out on Occoquan or Hunting Run most weekends -- those I don't, I'm usually down in Williamsburg area on one of the Cheatham Annex ponds. I also spend a fair amount of time on the banks of the Potomac - mostly Gunston Cove: Belvoir, Pohick, esp. Hopefully, Lunga will open back up this year, too. Looks to be a large active VA contingent in here. I'm looking forward to this community.