Essay mk1:
For a wind turbine, if it has more than 3 blades stay away from them unless you intend to use them at low speed (rpm) and in low wind areas (no storms at all). i.e old wild west water pumping.
Agree with Sean, never get to 2000W, very basic to start with, 2000W at 12V would be nearly 170A, aint going to happen, at least not at 12V.... or even 24V..... or even 48V..... maybe around 200V terminal voltage and full carbon fibre blades not the glass fibre ones.
The turbine shown, with 1.3m diameter, 15m/sec nominal maximum (constant) and a cp (blade efficiency coefficient) of 0.2 (generous) would give 571W if your lucky. 2kW, hahahha, Chinese special rating. The problem with 15m/s average wind speed is the gusts may be 25m/s depending on the terrain shape within a mile (see issues later).
Above 15m/sec the risks are with a combination of blade speed and twist (turbine moving out of the wind) pressure, which snaps the blades off if the rotor does not overheat, melt the windings or splig ring bushes. If the slip ring bushes burn out the turbine ends up free running and just disintigrates.
Smaller turbines are typically provided with a (cheap) fixed voltage PWM style controller, which will burn the windings out at higher wattages. A decent controller (or a specific manual switching method) will raise the voltage with output, which then keeps the maximum current limited to what the windings and brushes can handle (brushes in spliring connecting the turbine to cable in/on the pole, not the actual generator). Burning out the splipring bushes or windings is the most common mode of failure for these units, you can't just let them run in a storm or just wave good bye to them.
I have an IstaBreeze 700W unit (24V) and have had over 1.2kW (at 54V) out of it and this was about 8ft off the ground (hub), but you have to hold the turbine direction so this then stops it trying to turn out of the wind and break the blades at high speed. The blades were at the limit around 1.2kW as they were flexing with excess vortex at the tips (significant increase in noise).
The turbine direction was held by couple of thin ropes in my instance so as to keep the unit from moving around and is not a good long term option, but ok for storms and where the wind direction is slow changing when above the free moving level (hours).
This is not an ideal option and was a solution for me for a month, while living at a remote site and not good if you don't read the forecast (due to no mobile reception or the forecast changes) and have to start messing around at 3am in the rain with 40mph winds. After the first instance, it was just roped in direction every 6 hours of a storm or just pulled out of the wind and stopped completely well ahead of an issue storm.
Turbulance is a separate issue and you need to get very high to avoid the damaging gusts that occur like freak waves in the ocean. It is a combination of speed and direction changes that are separate issues to deal with in relation to turbulance. Over power and turning out of the wind stresses, both are separate issues to deal with.
Forgot to add, this was a site, where on 2 consecutive days 1kW of solar panels produced around 100Wh of energy due to fog (or rather being in the cloud base)....
This is the unit on a brief test in the garden attached to the crane with an extra section of steel.... yup, not a typical wind turbine tower.
The supposed MPPT controller (not PWM as it actually had a step-up stage for low winds), was pretty much useless at higher wattages, ok for light winds, useless above 10m/sec and had a service life of around 40 hours as I had other things to do before swapping it out...
The 1000W grid tie unit I have is also no good for storms becasue it cuts out at 1000W and effectively goes open circuit briefly for a few seconds the unit is also free running.... (amazed the turbine did not self destruct when it happened) so, ended up with the grid tie and a direct battery tap (direct 3-phase bridge rectifier). Below battery voltage the power all goes through the grid tie (with power curve) and then when the rectified peaks of the waveform are higher than the battery voltage these are clipped/shared off to the battery pack. This is not ideal becasue it places an upper cap on the turbine voltage, which then has an impact on the rpm for the wind speed increasing blade stress.
Essay over.