The most efficient tilt for photovoltaic panels in Fayetteville, North Carolina at a latitude of 35.08°:
Your photovoltaic panels need to be angled facing south.
If you're mounting the photovoltaic panels at a stationary angle, such as on your roof, the most efficient angle is 29.8°.
If you're planning to change the angle of your photovoltaic panels twice per year, the most efficient angle is 11.6° in summer months and 49.9° in winter months.
If you're planning to change the angle of your photovoltaic panels each season, the most efficient angle is 8° in summer months and 55.2° in winter months, and 32.1° in autumn and spring months.