Yes, wind speed estimates can vary widely across short distances, especially near bodies of water or mountainous regions; not so much in land locked areas where topography doesn't change much. The model estimate we can provide has a resolution of 250 meters, so it is sometimes worth looking at different locations in a general area.

4 m/s (10 mph) is the recommended winter wind speed average for an off-grid - hybrid system, however, that can vary and is site specific. Also recommended is minimal tree cover or an open area in the prevailing wind direction. If boots on the ground (local observations) are adamant that there is sufficient wind at the site, that is also taken into consideration when determining suitability for a hybrid solution.