My setup on the 14' widebody cartopper is a 30 lb thrust Minn Kota with a 29 group deep cycle battery. It is in parallel with a 20 hp 4 stroke.
I troll for hours on end with the electric because I enjoy how quiet it is and the manoeuvrability it provides.
The 20 hp is only fired up when the winds rise above 15 kph and it gets a bit choppy or if I wish to cross the lake in a hurry.
You can get a lot of information at this site based on your particular setup.
https://www.minnkotamotors.com/learn...rolling-motors