Translations:Tilt and azimuth/27/en

Under some conditions it makes sense to use a tilt for a PV module that is different than latitude.

• It is often the simplest, cheapest and most theft-proof option to install PV modules on the roof of a home. In this case, typically the angle of the existing roof is used as the tilt angle for the PV module. An 17° latitude, an PV module with a tilt angle of 7° will only produce an estimated 2.1% less than a PV module with a tilt angle of 17°.
• Mounting systems are frequently build that enable users to change the angle of the PV modules through the course of the year to maximize production at higher latitudes. The standard array angle adjustment is +15° at the fall solstice and -15° at the spring solstice. At 41° latitude, a system that is adjusted at the two solstices will produce an estimated 6% more than a system that is at a fixed 41° tilt. This additional energy can be crucial in the winter.
• If PV system is only going to be used seasonally then mounting the PV modules at an angle that maximizes production during that time of the year is advisable.
• As was mentioned previously, it is not advisable to mount PV modules at an angle of 0° near the equator as they are unable to shed water and will lose significant production as they become increasingly soiled. At least a 5° angle is recommended.