Jerry, to answer your original question, (1) I don't think this charger will keep up if you're trolling a lot. (2) Even if it did, do you want to leave your outboard running that long? In the long run it might be cheaper to pick up one of those little 1000 watt gennerators with a 12V output.

Joe here is the link I think Jerry's looking at. http://www.cabelas.com/catalog/produ...AL%3BIK-021667