I have a 15ft Lowes Jon boat with 25hp pull start I use on a small lake. I wired the whole boat with trolling motor (40 Motor Guide) and 2 depth finders (one down scan an one side scan). Bought 2 batteries one deep cell for trolling motor and lawn mower battery for depth finders and lights. Can fish 10 to 12 hour day with no problem. It works for me.