We bought our first sailboat last February, a 1985 CP16, and after reading a lot of pros and cons, decided to try an electric trolling motor.
We ended up with a MinnKota 50. Installed a marine battery forward and cut down an old set of 4 gauge jumper cables to run the length of the boat.
Since we live in the midwest we have only used it on a couple of local lakes.
It works great getting in and out of the dock, plenty of power.
We were out on Lake Rathbun last summer and got caught in a really bad storm, lightning, wind and rain, we lowered all sails and ran the electric against 15-20 mph winds in 2-3 foot swells for 20 to 30 minutes on about a 1/2 charged battery with no problems at all.
(Well no problem except I'm not sure I can get her to get back in the boat again.)
I would like to install a solar charger, but so far haven't had any issue with battery reserve.