I recently mounted the 90 watt panel on my boat in the Great Lakes to see how it compared to ym KC85T. The results were impressive. The 90 watt panel produced 5.5 to 6 watts consistently on sunny days (rare this Spring) and achieved a max output of 7.3 amps. It will easily produce 35 amp hours a day.
We also now offer a 130 watt solar panel which has the same dimensions as our 120 watt panel. It is ideal for pole mounting because it only weighs 24 pounds and is shorter and wider than standard panels of similar power.
If you have a need for smaller panels on your boat, check out Atom Voyages. James offers a top-of-pole mounting system that is ideal for panels in the 50 to 65 watt range.