This decline is due to the fact that solar panels during most of the day are exposed to weak and not perpendicular sunlight.
Solar panel angle measure.
This solar angle calculator tells you the optimum angle to get the best out of your system.
Find the best angle for optimizing solar collection during winter when solar energy is most scarce by multiplying your latitude by 0 89 and then adding 24 degrees.
To get the best out of your photovoltaic panels you need to angle them towards the sun.
At 90 from true south therefore east and west production can drop to 30.
The optimum tilt angle is calculated by adding 15 degrees to your latitude during winter and subtracting 15 degrees from your latitude during summer.
The optimum angle varies throughout the year depending on the seasons and your location and this calculator shows the difference in sun height on a month by month basis.
For instance if your latitude.
The summer optimum tilt angle on the other hand will be 34 15 19.