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Question about Vitamaster treadmill motor - Page 4

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Posted by clare on December 14, 2014, 5:19 am
On Sat, 13 Dec 2014 17:08:25 -0600, Paul Dudley

 The volts per RPM ratio favours using higher voltage motors as
generators for wind power. 40 volt computer tape motors work
reasonably well, while 90 volt treadmill motors have a much better
chance of putting out useable power, particularly with an active
voltage controller (downconverter)

Posted by amdx on December 14, 2014, 2:05 pm
On 12/13/2014 5:08 PM, Paul Dudley wrote:

Some fun facts:
  If you double the size of you propeller, you will have 4 times more  
energy available. (You can change the size of your propeller.)

Wind power is proportional to the third power of the wind speed; the  
available power increases eightfold when the wind speed doubles.
(You can move, but generally you are stuck with the wind at your site.)

  I'm quite

     What site did you use for the propeller info/template?

   Have you decided how you are going to regulate the voltage to  
properly charge your batteries when you have a wide variance in
  wind speed?


Posted by Jim Wilkins on December 14, 2014, 4:16 pm
When I connect my small solar panels to my tractor battery to top it  
off, instead of unplugging and bringing out the controller I put a  
homebrew LM317 voltage regulator and one of these in series:
(Amazon.com product link shortened)
and set the voltage to 14.8V to bring the battery up quickly, or  
around 14.0 if it will be left on charge a long time.

Watch out for the battery backfeeding the wiring, which is dangerous.  
The input diode in my Harbor Freight controller failed short and  
allowed that.

These are nice for larger currents and voltages:
(Amazon.com product link shortened)

Mine actually resolves current to 0.2A although it displays to 0.01A,  
so it's not good for float charging.


Posted by New Guy on December 14, 2014, 6:11 pm
 On Sun, 14 Dec 2014 08:05:46 -0600, amdx wrote:

  I wanted to start off with the 26 inch blades I've already made. And
 yes I have considered larger blades. Got to get my feet wet first.


  Actually there were quite a few..

    I would purchase a voltage controller like the one that came with my
   PV kit (HF).

Posted by Jim Wilkins on December 14, 2014, 6:31 pm
Be very sure it can handle the maximum unloaded voltage from the  
windmill in a strong wind when the controller stops drawing current  
because the battery is fully charged. The HF solar panel controller  
only barely meets its specifications.  

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