I was looking for the exact same information, wanting to put aboat and trolling motor with battery set up at my farm a little distance away and wondering about a system I could leave in place and be ready and charged when I decide to do a few loops around the pond, probably even less usage then jludwig was proposing.
Thanks for your inputs!
When I didn't have electricity at the dock, I used a small Honda portable generator. Not ideal by any means, but better than trying to take out huge battery and lugging it to and from the house.
