Just getting started, need validation

[new2wind]

Beginning my experiments designed for 12-16 mph average winds.  I'm drawn to Lenz2 VAWT turbine.  I plan to follow his wing design and figure I can vary RPM by moving wings in/out relative to center axis, at the compromise of torque.

I have come across a PMDC motor, for freezies, with these specs. Glentek, 9.8 amps, 23 in-lbs torque, 180 VDC, 2400 RPM, 25 KVA/kRPM.  Using a calculation I found on this forum, it seems this would be a good generator for 24VDC charging.

I would appreciate any comments.

[SparWeb]

Quick math:

180. VDC / 2400 RPM = 0.075 Volt/RPM
     
24. VDC / 0.075 V/RPM = 320 RPM
    
    

That's the speed where it just starts charging a 24V battery.  

On the other hand, it will start charging a 12V battery at 160 RPM or so.

These speeds are not usually appropriate for a VAWT.  If you really do have 12-16mph average winds where you live, you probably won't have any problems making any windmill work.  Very few of us live in places with so much wind.

[new2wind]

Steven,

Thanks for your input.  According to the Lentz design, I should expect 112 RPM @ 15 MPH, under a load.  Compared with your calculations, I appear to be in the correct ballpark to get my 12VDC to the batteries pretty regularly.  I may have to gear the the turbine to the motor to bring the motor speed into acceptable levels.  I realize the loss of torque and higher startup speeds.  Always a compromise in physics.

I'm located near South Point on the Big Island of Hawaii.  Lots of sun and wind.  I should be ripe for off-grid living.

Thanks again,

Mike