Qajak, in my early electric bilge pump projects I used the Pelican case with battery in the cockpit.
It did not work.
Pelican cases are only weatherproof (not submersible) and therefore did leak and ruined the set up.
Several others have thought of putting the Pelican case in the cockpit and found out that it failed (rewarding to know that I was not the only schmuck
You could find a truly leak proof box but it is supposed to be vented because of the gasses that SLA batteries emit...
For recharging the battery on long trips ( I use a SLA 1.3 Ah battery for illuminating the campsite, recharge camera batteries)
I use a small 5W solar panel in a clear dry bag on deck while paddling (no good to try recharging batteries at camp in the evening while the sun is setting...).
There are a few more details available at: http://gnarlydognews.blogspot.com/2009/ ... arger.html
panel on deck_sm (c).jpg
Thanks for the info. I will have to look into this a bit more because my battery only says that it must be removed from a sealed container to be charged. I was planning on using a watertight Pelican case. Perhaps the battery in the rear hatch is way to go though. I have a brand new 12AH battery so maybe I will use it. A little big but I am a minimalist and have a ton of room in my boat. I'll think about it some more.
The switch I made in my last pump was very easy and inexpensive BUT I always doubted it, even though it lasted very well. I cut it open after deciding to replace it and there was absolutely no corrosion or evidence of leakage. However, I know that, should I make another, I will still doubt it because there is no way to check except by destroying it. Better to go with the reed switch which I can be 100% sure of and can access without lifting the edge of my spray skirt..
That's a good idea with the batery charger on deck. I usually have a rest day or more built into my trips and figured I would recharge during that time but I like your idea.
ETA: I am also looking at building all the electronics onto a circuit board, testing it and then encasing it in a resin much like computer components on automobiles. This will not only aid in waterproofing but will make the system much more shock resistant.