Clint - Sorry for the delay in this post... been busy!
100 watt?! Wow, that's huge. I do have a 2hp Johnson 2 stroke, but there's nothing like the security the MinnKota supplies. Especially if the sun is shining. The MinnKota is connected to the battery (which is forward of the compression post) via a pair of (modified) battery jumper cables. I like them because of their heavy insulation. I figure if they're good enough to jump a car, they're good enough to run my MinnKota. I have a 50 amp fuse in-line (obtainable from Best Buy or the like complete with very heavy cables).
Since Pegasus is kept in the driveway at home 99% of the time, I have easy access to my car battery charger so I "top" off Pegasus' battery when I get home. I just bought a pair of small 1.5 watt solar panels (HF - $15.00 ea.) that hooked up in parallel (DON'T HOOK UP IN SERIES!) keeps the battery full. Although I like the 15 watt "briefcase" solar charger, I don't have much room on the CP16 for it. I tried it on the fore-deck but it takes up all the standing room - not good. The new, little guys can exist just aft of the air vent and (hopefully) I won't stand on them. I attach the panels to the deck with Velcro and run the cables through the vent. Actually, a bigger boat might solve the problem!
Even on the "hard", I do use the battery to maintain the VHF charge and occasionally run the bilge pump to clear out rain water that mysteriously gets in. In winter, as I mentioned above, I use a trickle charger for mere pennies.