The idea was to try 24v into a battery to find the trouble. You could then do something to get it working at 12v.
From your description of your site you bring me back to my original suspicion that the real trouble is lack of wind.
Urban sites just don't have any wind, plenty of turbulence to blow things over and rustle trees but with little usable power.
The best chance on a turbulent urban site is with a prop with lower tsr and slow alternator. You may possibly do better with more coarse pitch blades even pvc if you get the angles right. The maximum output will be low but you might get something more often.
I have had surprising results in some dreadful conditions down amongst trees with something based on Hugh's 4 ft machine ( tsr5) but even these conditions are likely to be better than in an urban site. I have never tried a machine here where I live, it would never be worth the effort.
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