I should've said, I wish there was a more affordable option. Even though, I have 15hp kicker, it's alternator, is nowhere large enough, to run what's available. Even the big motor, doesn't have enough alternator, to charge trolling batteries, unless you had long run.
600watts of solar, would provide 25%, of motor's draw, so would extend range by 25%, while providing bonus shade. Since there's very little shading issues, on the water, (unless you have blow boat), solar makes sense.