It just depends on where you live.
Solar panel installation angle to sun.
This is because the sun is always in the southern half of the sky in the northern hemisphere.
Calculating the ideal angle for your solar panels is not that difficult.
As a general rule of thumb keep in mind that the panels need to be more vertical during winter to face the lower sun directly and more tilted towards the ground during summer to face the higher sun.
The correct angle for your project will depend very much as to when you want to get the best out of your photovoltaic system.
While the angle of your solar panels is important a more important factor in your energy production is going to be the direction your panels face.
Therefore to get the very best out of your photovoltaic panels you would typically face them due south at the optimum angle so that the panel is receiving as much sunlight as possible at this time.
The optimum tilt angle is calculated by adding 15 degrees to your latitude during winter and subtracting 15 degrees from your latitude during summer.
At solar noon the irradiance from the sun is at its very highest and you can generate the most power.
In the northern hemisphere the sun is due south at solar noon.
Since solar panels are more productive when the sun s rays are perpendicular to their surfaces the certainly best orientation is the one directly true south azimuth angle 180.
Orientation of the panels.
Choosing the best angle and direction for your solar panels will optimize the amount of sunlight they receive and allow you to get the most out of your solar power system.
For the best results solar panels should be oriented towards the south.
Here two simple methods for calculating approximate solar panel angle according to your latitude.