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'nuff said.... :)

My son sent me a little video re 6 volt batteries. Basically, if you pry the top off of a 6 volt lantern battery and snip the wires inside you will have 32 AA cells. Since a 6 volt lantern battery...

Check out this website: http://www.josho.com/gardening.htm
It should fit in with your ideas. Of course, you could always start small and build up from there. I built two last summer for tomatoes...