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Originally Posted by Jimm H
*PWM- Pulse Width Modulation.... a circuit that limits current use in a DC circuit by providing a variably-controlled dc pulse output to power the dc device. The output is still the required 12V, but is current-limited to save energy. Kits are about $25 at Gateway Electronics (Chesapeake Dr. in Kearny Mesa). They are manufactured by Velleman.
Personally, I would minimize the electronics on the kayak and just use a manual switch to control running the pump. Just more to fail.
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A better way to go is to use a 6V sealed lead acid battery(10 or 12 AH). Using this with a 350 or even 500 gph submersible bildge pump will get you a full day with out having to use a PWM or a manually limiting the flow. I've been using a 10 AH 6V battery for a few years now and I have no complaints.
Please note that the 6V solution doesn't work as well with the aerator style pumps. The flow is considerable less in those applications.
Kevin