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They also don't stand up to much abuse. I'd imagine it wouldn't survive long if you were trying to use it on the water and then keep it attached to your kayak during transport. Constantly removing and reinstalling it is also ripe with opportunities for damage.
Most of those little chargers only claim 1.5W, which at 12V is probably going to be less than 100ma. So your typical 9-10ah battery will take 90-100 hours for a complete charge in full sun. Consider a pump draws around 1 amp, you're still charging for 10x the time you ran your pump to replenish a battery.
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