How does Enlighten use the Annual Degradation Factor?
Learn about the factors Enlighten uses to calculate production, including Annual Degradation
The Annual Degradation Factor enables Enlighten to adjust the production estimate for a PV system to more accurately reflect actual production over time.
The Enlighten default for the Annual Degradation Factor is 0.5%, and originates from an NREL analysis which lists a median rate of degradation 0.5% per year. A positive degradation rate indicates a decrease in system performance. For example, an annual degradation factor of 0.5% indicates that after 20 years, a system will produce 90% of its initial output.
