I've bought locally from installers 800 miles away from each other. The small guys are happy with single panel sales to get rid of a odd panel left over from a pallet. 280W for less than $170 out the door. I just needed to know your design criteria. My understanding is 50W is a lot of wind. You ought to try the two motor idea. It can always be converter later.
Thanks for the tip on locating. I thought when rebates stopped in Missouri there wouldn't be any installers in business any more. But I found panels on craigslist at reasonable prices. If I want to start pumping water with solar looks like I can quickly and easily. May do.
Still want to experiment with the F&P style Whirlpool 0.6 mm wire wound motors I bought. One lesson learned the hard way, need a splined shaft from the washing machine to mount the rotor on. Another $34.00 for each and a few days delay. Wish I knew of an appliance boneyard around here. Hate to drive 60 miles for a $50 used washing machine and try to figure out if it has the motor I want.
Have spent hours researching F&P generator conversion and use. Site after site almost have complete information but falls down when the last details are needed.
Are users really rewiring stators Unsymmetrically with different coils around the 360 degrees wired differently? Some offer "do this this way" but electrically I cant see if its 3 identical phases with a group of three coils in parallel in series with another three coils in parallel and so on. Or what and what the result is. The back shed has a lot of information but not complete enough for me to invest a great deal of work in copying something with unknown results.