The tilt is included angle of horizon and solar panel.
Equation for fixed solar panel tilt angle.
Subtract 15 degrees from the latitude at your location during summer and add 15 degrees to your latitude during winter.
This table gives some examples.
Similarly you can calculate the angle for winter by adding 15.
Various optimum tilt angle values were provided in the literature for fixed solar panels.
Both of these angles require latitude degrees.
If you are able to adjust the angle of your solar panels a few times per year here is the adjustment schedule we recommend.
Tilt the panels to your latitude.
Tilt the panels to your latitude minus 15.
The decision of azimuth.
There s a simple rule of thumb for calculating the best tilt angle for fixed mount solar panels.
Whatever your latitude is you can subtract 15 from it to calculate the angle for summer.
For a precise method use the second formula on this page to calculate tilt angle.
If your latitude is between 25 and 50 then the best tilt angle for summer is the latitude times 0 93 minus 21 degrees.
For instance if your latitude is 34 the optimum tilt angle for your solar panels during winter will be 34 15 49.
Tilt the panels to your latitude plus 15.
The optimum tilt angle is calculated by adding 15 degrees to your latitude during winter and subtracting 15 degrees from your latitude during summer.
There are two methods for calculating the tilt angle for solar panels.
If your latitude is outside this range see other situationsbelow.
The best tilt angle for winter is the latitude times 0 875 plus 19 2 degrees.
The summer optimum tilt angle on the other hand will be 34 15 19.