A Wind Turbine Generator (WTG) consists of

• a rotor with three rotor blades
• an integrated charge controller
• a mounting pole or tower

The perfect solution is a homesystem consisting of Solar Panels and of a WTG, that both will charge the batteries – it is calles a “hybrid system”.
With an additional WTG you will reduce the stress for your batteries. Furthermore the WTG will prolonge the autonomy of your system, because electricity will be generated and stored also during the nighttime and during the cloudy rainy season.
While normally the investment for a WTG is a less than for Solar Panels you have to be aware to rely exclusivly on WTG only in areas where the wind speed is a reliable and permanent power source.
Solar and wind resources often compliment each other. Generally when it is sunny it is calm and when it is cloudy it is windy. This complimentary effect is even greater during seasonal changes. During the rainy season the sun is at its least exposure, the wind is at it highest. A WTG during these periods is essential to keep your batteries charged and your lights on. If both resources are available, then a hybrid system is the more economical approach. A hybrid system uses fewer batteries and the battery bank is cycled less, which results in longer battery lifetimes and lower costs. If you already have solar panels, consider adding a WTG to your system for extra dependability and long term cost savings.
Wind energy is not for everyone. Your site must have enough wind and be free from wind obstructions. Example: If your house is 10 m high and you want to install the WTG behind your houese the tower shoud be at least 20 m high. If you have a large piece of land you also con install the WTG with a 10 m tower but 100 m behind the obstruction.
Why not install the WTG in front of the house? Noise pollution is the main reason! If your WTG is behind the house, the noise will „fly away“ from your place.

Like Solar the power of a WTG is measured by “Watt-peak”.
But this number will be reached is only at higher windspeeds of
10-12 m/s – these are not the average windspeeds.
At a smaller windspeed the energy output will be fairly less. In order to estimate the average generator output every relible manufacteurs will indicate the monthly energy output compared to the annual average wind speed (see chart).

A Wind Energy Resource Altas of South Asia (published by the World Bank) shows for Koh Samui an average annual wind speed of 5 m/s. Compared with the chart above for a 400 Wp WEA this will give an monthly energy output of 20-35 kWh or 240-420 kWh per year.
For South Thailand this can be compared with to a solar panel at 340 Wp.

A 400 Wp small wind turbine generator equals on Koh Samui a solar panel with 340 Wp - if installed on a suitable site.