What do I have?

Regarding the electrical part... A wind turbine is basically an alternator (like the one in your car) that generates >24 VAC (can be several times 24 VAC)... You may have the three AC power lines that come from the alternator down to a wind controller (rectifier, regulator, possibly MPPT switch mode controller, perhaps some resistors/heaters to dump excess power when the batteries are charged and it is still windy, and possibly some sort of braking mechanism... Mechanical brake, furl out of wind, feather blades, short out AC alternator, etc.).

The turbine would ideally be mounted at least 30 feet above the ground, and at least 10 feet above any obstructions within ~500 feet... The turbine needs to be in "laminar" or very smooth airflow. If it is in turbulent air (buildings, trees, mountains, etc.), there is very little useful energy that can be harvested in turbulent wind.

Is there any brand/model on the turbine? Perhaps a couple pictures, and somebody can identify it?

I am not a big fan of wind... And many times, the home made DIY turbines are better than what you can buy--Plus you can make your own parts to repair them, when needed.

Here are some links to other sources of Wind Power information (including other forums that are more wind centric than our's):

Wind Power Links
www.otherpower.com (good forum for DIY Wind Power)
Hugh Piggott - Scoraig Wind Electric site for tons of info (from mike90045)
Scoraig Wind "Recipe Book" for DYI Turbines (from Chris Olson... From his 4/11/2013 post)
www.greenpowertalk.org (added from "russ"--Like here but more wind/less solar)

-Bill

Almost looks like one of these:

https://www.windandsolar.co.za/shop/turbine-ne-m2-600w/

Assuming fixed blades (no feathering/fixed based to hub)... The typical issues with a turbine not turning at all could be 1) blades installed "backwards" (wind is going "backwards" through air foils). -- Not likely, but a possibility.

2) Pole/yaw bearings not square to ground... Turbine not pointing into wind (if pole/yaw bearing is not square to ground, turbine will point out of wind).

3) Brake applied... If all you have is the 3 AC wires (plus possible ground), the only "brake" is when the output of the turbine is shorted (alternator has very high torque when feeding a dead short). If the alternator has in internal short, can also "brake" the turbine. However, if you can spin the blades by hand to a fair speed--Does not sound like any brake/shorted windings/shorted AC output is happening.

4) Poor design... Help, my wind turbine is not spinning, but I can turn by hand/with an electric drill/etc. is not an uncommon complaint here. If the turbine has never spun correctly, it usually requires re-engineering the unit (adding large plywood tail to point better into wind, check Alternator windings are Wye or Delta wound, etc.).

5) Poor siteing... Simply not enough wind, turbulent wind. Certainly looks like a good site, and if it is "miserably" windy there, generally a good start (looking for "flagging trees" is another good sign). Another trick is to go fly a kite--You want the kite to fly straight and level at "hub height" of the wind turbine... If the kite is buffeted by turbulence, then try to fly higher and find smooth air.

Pull the turbine back down... Get some Names/Part numbers from any components/alternator/casting/fairings/etc... And try to figure out the Rating of the alternator and compare that to the diameter/pitch of your present blades.

One thing to be very careful of... Horizontal Axis Wind Turbines can very easily overspeed and self destruct in moderate to heavy winds. Generally you want the controller/electric braking system (shorting the alternator, battery bank for sustained load, dump controller+dump loads, etc. (not all turbine installations use all of these pieces)). You don't want the turbine flying without some sort of RPM control.

Most smaller wind turbines are designed to be "permanently" connected to the battery bank to provide torque (from dumping current into the battery bank) and prevent overspeed. Some will have a simple shorting switch (possibly with a series power resistor) to draw high current from the alternator, provide high torque/resistance to spinning, and "stall" the blades.

That is probably about all I can do from here... I am certainly no-way a wind turbine expert by any means. (I do not sell, install, maintain turbines or solar power systems, I am simply a volunteer here with some engineering experience).

-Bill