As told by you all to make wooden blades, i can't seem to get that much time from work to do it for now.

I have put the gen up and put a 15amp blocking diode and just for checking a 12V 7Ah lead acid battery which i had new from a ups, as my mill hardly makes more than 1.5amp, is it the diode enough? how long should it take to charge this battery to be of any use?

Kindly please help with the gearing issue too, i'm stuck with 7-9volts, it reaches 12-14v but not for long and 2-3 times an hour hardly.