ideal inclination of the solar panels


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Find the ideal inclination of the solar panels according to your region.

Keywords: France, solar, thermal, tilt, photovoltaic, formula, self-build, construction, tips, tricks, performance, optimize ...



The tilt of your solar panels will depend on their thermal generation in the year and therefore their profitability, so it is important not to neglect this aspect.

Adjust the position of the solar panels.

The adjustment on the horizontal (azimuth) is obtained by pointing the solar panels: to the south when in the northern hemisphere to the north when in the southern hemisphere.

The solar panels should be placed perpendicular to the sun for best results. The adjustment vertically requires knowing the path of the sun, depending on the season and geographical location:

Equinoxes of March and the 21 21 September, the sun is perpendicular to Ecuador.
In 21 the solstice in June, it is perpendicular to the Tropic of Cancer (northern hemisphere).
At Solstice 21 December it is perpendicular to the Tropic of Capricorn (southern hemisphere).

The inclination of the panels relative to the horizontal is given by the following relationship:

Tilt = (latitude of the place) - Arcsine (0,4 * * Sinus (N.360 / 365))

N = number of days between the spring equinox (21 March each year) and the day considered a negative sign to the cold season.

Changes in the tilt angle are shown on the figure below (example for mainland France).
a +/- 23 ° (ie 46 ° amplitude over a year) was observed compared to the latitude. This angle of 23 ° corresponds to the inclination of the earth.

tilt optimal solar panel in France

France, for practical and cost reasons, most solar panels are fixed tilt: around 45 ° as it presents a good compromise enough (summer / winter).


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