... I had a 15'long by 42"wide jon boat the 40lb thrust
minkota hand operated trolling motor moved me the boat
and my fishing partner along with all our gear. ...
all this stuff including us and we trolled, ran the
lights, fish finder and spot light for never less than
5 hours and had power to spare. ...

This sounds very encouraging. This means using a trolling motor on a
rowboat is a practical choice for an electric-only lake.

I probably will get a semi-V boat instead of a jon boat. The reason is
that I also intend to use it in protected coastal area (of course with
a gas engine).

Thanks.

Jay Chan