In case the roof is very steep you may not be able to get the most optimal tilt angle for the panel especially if it is lower than the angle of the roof.
Solar panel inclination calculator.
Solar panel tilt calculator this calculator will help you determine the optimum tilt for your solar panel based on your latitude.
If your solar panels will have a fixed tilt angle and you want to get the most energy over the whole year then this section is for you.
The violet line is the solar energy per day if the panel is fixed at the winter angle discussed below these figures are calculated for 40 latitude.
For this calculator latitude is positive to the north and longitude is positive to the west of the prime meridian.
Most roofs have an inclination of 30 to 40 degrees.
In the northern hemisphere solar pv panel must be south facing and in the southern hemisphere solar pv panel must be north facing the optimal angle for your solar panels 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.
Tilt degrees are expressed as the angle from horizontal.
Solar panels should point south in the northern hemisphere and point north in the southern hemisphere.
Solar angle calculator this solar angle calculator tells you the optimum angle to get the best out of your system.