Ken,
This may be a better approach?
This will approach a Banki/Mitchell type of turbine but will probably not get the rpm's of a Pelton.
In the first blower/motor combination it calls for 3500 rpm at 12 volts. You will have to get about 4200 rpm to start charging a battery (you will need about 14.5+ volts for battery charging).
No rpm specs on the second one so I can't tell.
Perhaps using the squirrel cage set up with a different DC motor would be doable.
Threadmill motors are usually DC rated at about 100 volts at 4500 rpm. Using a motor like that it would start generating charging power at about 650 rpm. You can find these things at scrap yards (I have 3 of them). Perhaps Amtec motors would work out as well but I'm not familiar with them (check other posts).
Of course you could always build your own, that would probably be the best option but would require work on your side but you could match it to your conditions.
Check this site where one was built.
http://www.otherpower.com/otherpower_hydro.html
By the way you stated that the 150 ft head was not really a head but the equivallent? what do you mean by this? Do you have about 75 psi at the well source? What will you do with all the water? 4 gallons per min. is a lot of water over time. Make sure you don't run the well dry, especially if others are on the same vein.
Hope this helps and be carefull this stuff is very contagious,
Hank