Hi Flux, I was thinking I would probably use a 16 foot prop. With the magnet discs I have not gotten them cut out yet but I was calculating the magnet spacing and it seemed that with 24 magnets per rotor and with about a 22 inch diameter discs the magnets would be spaced similarly to the ones on the 500watt turbine in Hugh Piggott's book, but I may not have looked it over carefully enough. I may be able to return the 16 gauge wire I have and trade it in for 15 or 14, also I do need batteries for the ups so I am debating on wether or not to use it and spend on a bunch of batteries or maybe get a 48 volt ups. Thanks for your comments and advice.