I use arm & hammer washing powder, my biggest tub I have currently available is a 30 gallon rubbermaid. I've got a selectable battery charger that goes 2-60amps / 6-12V. You do need to adjust the amount of sodium carbonate vs. the amount of water. The biggest thing to remember is DON'T use any stainless steel, you could end up killing yourself from the reaction. Temperatures don't really matter either, my garage isn't heated and gets down to around 40 in the winter, I've done it then without any problems.
These links are basically the same, but it may give you an idea on wiring up a larger vat. The last one shows a pretty good sized "tub" with a rubber lining.
http://antique-engines.com/electrol.asp
http://www.rowand.net/Shop/Tools/Electrolysis.
http://1bad6t.com/rust_removal.html
http://ct-web2.unh.edu/lee/electrolysis.htm
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Gary
'49 Farmall Cub, '62 "Original, '70 73 w/402-D Haban sickle, '71 127 w/38" cast end deck, '73 149, '76 Sof76, '07 LT1045 w/bagger, '09 GT2544 w/bunch of mods.
5 Exmarks, Kubota B2920, blah, blah, blah...
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