PS: note that you gave a power value of 3 kW for a rotor diameter of 1,80 m, but this power value does not correspond to the usual diagram above, which only mentions about half, i.e.: 1,6kW for 2m.
It would therefore be well to start by clarifying what the installation has produced in kW/h - and this data must appear in the EDF readings - and compare this with what your installation is theoretically capable of producing under your conditions. In reality, this is how an installation should be chosen:
Professionals use wind masts which they place on sites with wind potential,
and carry out measurements for at least one year. Once the measurements have been recorded and analyzed, it is necessary to choose the wind turbine that best corresponds to the characteristics of the wind and the terrain. Only a professional can do this job. Many parameters must be taken into account. The efficiency of the turbines is different depending on the nature of the wind. Some lose much of their effectiveness in turbulence.
Source:
https://energie-verte.blogspot.com/2009 ... liers.html
In view of the above, there is a good chance that your installation was carried out "at best" but without readings over a year (since they should have been very expensive) - you can always publish what the EDF readings have given — but without wanting to discourage you, I therefore believe above all that those who install
“small domestic wind turbine,” it's more "for the glory"...
And in view of his rather eloquent comment:
In your place I would try to evaluate (thanks to the EDF statement) what your installation is able to produce
as is but I wouldn't incur any costs and would head straight for the installation of solar panels, where each euro invested should bring you more than in the correction or possible improvement of your installation. current. The reason is simple, a serious diagnosis would cost you a lot of money, and without testing over a year, it does not seem possible to predict whether the hardware installed “guess” would be the one needed based on the results.